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AUSCERT External Security Bulletin Redistribution
ESB-2021.0705
Cisco NX-OS Software: Multiple Vulnerabilities
25 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco NX-OS
Publisher: Cisco Systems
Operating System: Cisco
Virtualisation
Impact/Access: Root Compromise -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Cross-site Request Forgery -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1387 CVE-2021-1367 CVE-2021-1361
CVE-2021-1229 CVE-2021-1227
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-nxos-icmpv6-dos-YD55jVCq
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nxapi-csrf-wRMzWL9z
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-dos-Y8SjMz4
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3000-9000-fileaction-QtLzDRy2
Comment: This bulletin contains five (5) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco NX-OS Software ICMP Version 6 Memory Leak Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-fxos-nxos-icmpv6-dos-YD55jVCq
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvv24541 CSCvv96592 CSCvv96593
CVE Names: CVE-2021-1229
CWEs: CWE-401
Summary
o A vulnerability in ICMP Version 6 (ICMPv6) processing in Cisco NX-OS
Software could allow an unauthenticated, remote attacker to cause a slow
system memory leak, which over time could lead to a denial of service (DoS)
condition.
This vulnerability is due to improper error handling when an
IPv6-configured interface receives a specific type of ICMPv6 packet. An
attacker could exploit this vulnerability by sending a sustained rate of
crafted ICMPv6 packets to a local IPv6 address on a targeted device. A
successful exploit could allow the attacker to cause a system memory leak
in the ICMPv6 process on the device. As a result, the ICMPv6 process could
run out of system memory and stop processing traffic. The device could then
drop all ICMPv6 packets, causing traffic instability on the device.
Restoring device functionality would require a device reboot.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-nxos-icmpv6-dos-YD55jVCq
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco NX-OS Software
and had at least one interface configured for IPv6 traffic:
MDS 9000 Series Multilayer Switches ( CSCvv24541 )
Nexus 1000 Virtual Edge for VMware vSphere ( CSCvv96593 )
Nexus 1000V Switch for Microsoft Hyper-V ( CSCvv96593 )
Nexus 1000V Switch for VMware vSphere ( CSCvv96593 )
Nexus 3000 Series Switches ( CSCvv24541 )
Nexus 5500 Platform Switches ( CSCvv24541 )
Nexus 5600 Platform Switches ( CSCvv24541 )
Nexus 6000 Series Switches ( CSCvv24541 )
Nexus 7000 Series Switches ( CSCvv24541 )
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode ( CSCvv96592 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvv24541 )
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Determine the Status of IPv6 on Cisco NX-OS Software
To determine whether a device will accept incoming IPv6 packets, use the
show ipv6 interface brief vrf all command at the device CLI. A device could
be affected by this vulnerability if the command returns an IPv6 interface
status from at least one interface, as shown in the following example:
Switch# show ipv6 interface brief vrf all
IPv6 Interface Status for VRF "default"(1)
Interface IPv6 Address/Link-local Address Interface Status
prot/link/admin
Eth1/65 2001:db8:1:f101::1 up/up/up
fe80::23a:7dff:fe95:d071
IPv6 Interface Status for VRF "management"(2)
Interface IPv6 Address/Link-local Address Interface Status
prot/link/admin
Note: By default, no IPv6 addresses are enabled in Cisco NX-OS Software. An
interface of a Nexus device can be configured with an IPv6 address through
the ipv6 address [...] or ipv6 link-local [...] CLI configuration commands.
Also, the ipv6 forward CLI configuration command can be used to allow an
interface to accept IPv6 packets even if no IPv6 address is configured.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Indicators of Compromise
o This vulnerability causes a system memory leak in the ICMPv6 process.
ICMPv6 memory exhaustion can result in device instability. The following
indicators of compromise that may occur if this vulnerability is being
actively exploited.
Contact the Cisco Technical Assistance Center (TAC) if additional help is
needed to determine whether this vulnerability may have been exploited on
the device.
Memory Allocation
Exploitation of this vulnerability will cause the IPCMPv6 process to
continue allocating memory until the memory limit is reached. This memory
is not returned, and a device reboot is required to recover. Use the show
processes memory sort command at the CLI to monitor the MemUsed field. The
command output also shows the memory limit.
nxos# show processes memory sort
PID MemAlloc MemLimit MemUsed StackBase/Ptr Process
----- -------- ---------- ---------- ----------------- -----------
7073 561393664 1067925798 1152303104 ffc80440/ffc7fed0 icmpv6
If the show processes memory sort command is not available, use the show
processes memory | include icmpv6 command at the CLI:
nxos# show processes memory | include icmpv6
PID MemAlloc MemLimit MemUsed StackBase/Ptr Process
----- -------- ---------- ---------- ----------------- -----------
27418 26259456 1366538124 1000681472 ffca1d60/ffca1800 icmpv6
ICMPv6 Errors
Monitor for syslog messages about ICMPv6 errors, such as the two that
follow:
%ICMPV6-3-ATIMERS_ERROR: malloc failed in heap_create
%ICMPV6-3-ERROR: -Traceback: librsw.so+0x11250e librs w.so+0x10be66
libam.so+0xd7f3 libam.so+0xe4cd icmpv6=0x1004f000 0x100ed1b9 0x101
05623 0x10078fe7 libipv6.so+0x14988 librsw.so+0xc8658
libpthread.so.0+0x609b lib c.so.6+0xd6a5e
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
TAC or their contracted maintenance providers.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Cisco Nexus 7000 Series Switches SMUs
For Cisco Nexus 7000 Series Switches, software maintenance upgrades (SMUs)
are available for Cisco NX-OS Software Release 8.2(6). Customers can
download the following SMUs from the Software Center on Cisco.com:
n7000-s2-dk9.8.2.6.CSCvx15395.bin
n7700-s2-dk9.8.2.6.CSCvx15395.bin
For details about downloading and installing SMUs in Cisco NX-OS Software
for Cisco Nexus 7000 Series Switches, see the Performing Software
Maintenance Upgrades section of the Cisco Nexus 7000 Series NX-OS System
Management Configuration Guide .
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fxos-nxos-icmpv6-dos-YD55jVCq
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software IPv6 Netstack Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-nxos-ipv6-netstack-edXPGV7K
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvu11961 CSCvu77380
CVE Names: CVE-2021-1387
CWEs: CWE-401
Summary
o A vulnerability in the network stack of Cisco NX-OS Software could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
condition on an affected device.
This vulnerability exists because the software improperly releases
resources when it processes certain IPv6 packets that are destined to an
affected device. An attacker could exploit this vulnerability by sending
multiple crafted IPv6 packets to an affected device. A successful exploit
could cause the network stack to run out of available buffers, impairing
operations of control plane and management plane protocols and resulting in
a DoS condition. Manual intervention would be required to restore normal
operations on the affected device.
For more information about the impact of this vulnerability, see the
Details section of this advisory.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K
This advisory is part of the February 2021 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication. For a complete list of the
advisories and links to them, see Cisco Event Response: February 2021 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and have an IPv6 address or
ipv6 forward configured on at least one interface:
Nexus 3000 Series Switches ( CSCvu11961 )
Nexus 5500 Platform Switches ( CSCvu11961 )
Nexus 5600 Platform Switches ( CSCvu11961 )
Nexus 6000 Series Switches ( CSCvu11961 )
Nexus 7000 Series Switches ( CSCvu11961 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvu11961 )
UCS 6400 Series Fabric Interconnects ( CSCvu77380 )
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Status of IPv6 on Cisco NX-OS Software
To determine whether a device will accept incoming IPv6 packets, use the
show ipv6 interface brief vrf all command at the device CLI. A device could
be affected by this vulnerability if the command returns an IPv6 interface
status from at least one interface, as shown in the following example:
Switch# show ipv6 interface brief vrf all
IPv6 Interface Status for VRF "default"(1)
Interface IPv6 Address/Link-local Address Interface Status
prot/link/admin
Eth1/65 2001:db8:1:f101::1 up/up/up
fe80::23a:7dff:fe95:d071
IPv6 Interface Status for VRF "management"(2)
Interface IPv6 Address/Link-local Address Interface Status
prot/link/admin
Note: By default, no IPv6 addresses are enabled in Cisco NX-OS Software. An
interface of a Nexus device can be configured with an IPv6 address through
the ipv6 address [...] or ipv6 link-local [...] CLI configuration commands.
Also, the ipv6 forward CLI configuration command can be used to allow an
interface to accept IPv6 packets even if no IPv6 address is configured.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
Details
o This vulnerability is due to buffers not freeing properly in the Cisco
NX-OS Software network stack known as netstack . If an affected device runs
out of available buffers, it will stop processing incoming packets for
multiple management plane protocols and control plane protocols (including
routing protocols). This may cause those protocols to stop working properly
on the affected device, resulting in operational failures that could impact
traffic and cause a DoS condition. The impact could depend on the specific
platform and the software release on the device. A manual reload of the
device is required to restore normal operations.
For this vulnerability to be exploited, the IPv6 traffic must be destined
to an affected device. Traffic that transits an affected device cannot be
used to exploit this vulnerability.
Indicators of Compromise
o Exploitation of this vulnerability could cause the affected device to
consume all available network stack buffers and generate error messages
similar to the following:
2021 Jan 25 16:07:39 nexus %NETSTACK-3-MBUF_FAILED: netstack [27340] m_copyin
() failed in ipv6_data_main() ...
2021 Jan 25 16:07:44 nexus %NETSTACK-3-IPV6_API_FAILED: netstack [27340]
m_copyin() failed in ipv6_process_pm_data_msg()
These error messages could have multiple causes. Customers who observe
these messages on a device are advised to contact their support
organization to determine whether the messages indicate that the device has
been compromised by exploitation of this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Cisco UCS Software
In the following table(s), the left column lists Cisco software releases.
The center column indicates whether a release is affected by the
vulnerability described in this advisory and the first release that
includes the fix for this vulnerability. The right column indicates whether
a release is affected by all the vulnerabilities described in this bundle
and which release includes fixes for those vulnerabilities.
UCS 6400 Series Fabric Interconnects
Cisco UCS First Fixed Release First Fixed Release for All
Software for This Vulnerabilities Described in the Bundle
Release Vulnerability of Advisories
4.0 4.0(4k) 4.0(4k)
4.1 4.1(1e) 4.1(1e)
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software NX-API Cross-Site Request Forgery Vulnerability
Priority: High
Advisory ID: cisco-sa-nxos-nxapi-csrf-wRMzWL9z
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr82908 CSCvu67365 CSCvv92342
CVE Names: CVE-2021-1227
CWEs: CWE-352
CVSS Score:
8.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the NX-API feature of Cisco NX-OS Software could allow
an unauthenticated, remote attacker to conduct a cross-site request forgery
(CSRF) attack on an affected system.
This vulnerability is due to insufficient CSRF protections for the NX-API
on an affected device. An attacker could exploit this vulnerability by
persuading a user of the NX-API to follow a malicious link. A successful
exploit could allow the attacker to perform arbitrary actions with the
privilege level of the affected user. The attacker could view and modify
the device configuration.
Note: The NX-API feature is disabled by default.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nxapi-csrf-wRMzWL9z
This advisory is part of the February 2021 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication. For a complete list of the
advisories and links to them, see Cisco Event Response: February 2021 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco NX-OS Software and have the NX-API
configured:
MDS 9000 Series Multilayer Switches ( CSCvv92342 )
Nexus 3000 Series Switches ( CSCvr82908 )
Nexus 5500 Platform Switches ( CSCvu67365 )
Nexus 5600 Platform Switches ( CSCvu67365 )
Nexus 6000 Series Switches ( CSCvu67365 )
Nexus 7000 Series Switches ( CSCvv92342 )
Nexus 9000 Series Switches in standalone NX-OS mode ( CSCvr82908 )
Note: The NX-API feature is disabled by default.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the Device Configuration
To determine whether an affected device is configured with the NX-API
feature enabled, use the show feature | include nxapi command from the
Cisco NX-OS CLI and verify that the feature is enabled. The following
example shows the NX-API feature enabled on a device that is running Cisco
NX-OS Software:
nxos-switch# show feature | include nxapi
nxapi 1 enabled
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Details
o On Cisco Nexus switches, CLIs are run only on the switches. The NX-API CLI
is an enhancement to the Cisco NX-OS CLI system, which supports XML output.
The NX-API CLI has the following features:
Can be used on the switches
Supports the JSON output format for specific commands
Makes the CLIs available outside of the switch by using HTTP/HTTPS
Supports show commands, configurations, and Linux Bash
Workarounds
o There are no workarounds that address this vulnerability.
However, because a device is not affected by this vulnerability if the
NX-API is not configured, administrators may consider disabling the NX-API
as a mitigation.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Cisco Nexus 7000 Series Switches SMUs
For Cisco Nexus 7000 Series Switches, SMUs are available for Cisco NX-OS
Software Release 8.2(6). Download the following SMUs from the Software
Center on Cisco.com:
n7000-s2-dk9.8.2.6.CSCvx15395.bin
n7700-s2-dk9.8.2.6.CSCvx15395.bin
For details about downloading and installing SMUs in Cisco NX-OS Software
for Cisco Nexus 7000 Series Switches, see the Performing Software
Maintenance Upgrades section of the Cisco Nexus 7000 Series NX-OS System
Management Configuration Guide .
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-nxapi-csrf-wRMzWL9z
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Protocol Independent Multicast Denial of Service
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-nxos-pim-dos-Y8SjMz4
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvv98438
CVE Names: CVE-2021-1367
CWEs: CWE-20
Summary
o A vulnerability in the Protocol Independent Multicast (PIM) feature of
Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to
cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by sending a crafted PIM packet to an
affected device. A successful exploit could allow the attacker to cause a
traffic loop, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-dos-Y8SjMz4
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Nexus 9500
R-Series Switching Platforms if they were running a vulnerable release of
Cisco NX-OS Software and had the feature pim command configured.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Note: No other Cisco Nexus 9000 Series Switches in standalone NX-OS mode
are affected by this vulnerability.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 3000 Series Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during the resolution of a Cisco TAC support
case.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-pim-dos-Y8SjMz4
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------------------------------------------------------------
Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability
Priority: Critical
Advisory ID: cisco-sa-3000-9000-fileaction-QtLzDRy2
First Published: 2021 February 24 16:00 GMT
Version 1.0: Final
Workarounds: Yes
Cisco Bug IDs: CSCvw89875
CVE Names: CVE-2021-1361
CWEs: CWE-552
Summary
o A vulnerability in the implementation of an internal file management
service for Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series
Switches in standalone NX-OS mode that are running Cisco NX-OS Software
could allow an unauthenticated, remote attacker to create, delete, or
overwrite arbitrary files with root privileges on the device.
This vulnerability exists because TCP port 9075 is incorrectly configured
to listen and respond to external connection requests. An attacker could
exploit this vulnerability by sending crafted TCP packets to an IP address
that is configured on a local interface on TCP port 9075. A successful
exploit could allow the attacker to create, delete, or overwrite arbitrary
files, including sensitive files that are related to the device
configuration. For example, the attacker could add a user account without
the device administrator knowing.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3000-9000-fileaction-QtLzDRy2
This advisory is part of the February 2021 Cisco FXOS and NX-OS Software
Security Advisory Bundled Publication. For a complete list of the
advisories and links to them, see Cisco Event Response: February 2021 Cisco
FXOS and NX-OS Software Security Advisory Bundled Publication .
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
Cisco NX-OS Software Release 9.3(5) or Release 9.3(6):
Nexus 3000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
These devices are vulnerable by default.
To check a device, use the show sockets connection | include 9075 CLI
command. If the command returns output, as shown in the following example,
the device is vulnerable:
nexus# show sockets connection | include 9075
tcp LISTEN 0 32 * : 9075
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
MDS 9000 Series Multilayer Switches
Nexus 1000 Virtual Edge for VMware vSphere
Nexus 1000V Switch for Microsoft Hyper-V
Nexus 1000V Switch for VMware vSphere
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Fabric Switches in Application Centric Infrastructure
(ACI) mode
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Workarounds
o Using infrastructure access control lists (iACLs) to allow only strictly
required management and control plane traffic that is destined to the
affected device, as recommended in the Cisco Guide to Securing NX-OS
Software Devices , would prevent remote exploitation of this vulnerability.
Customers are advised to explicitly deny all TCP packets that are destined
to a locally configured IP address with a destination port of 9075 as part
of their iACLs. A customized control plane policing (CoPP) policy may also
be used to drop all TCP port 9075 traffic that is destined to an affected
device.
Customers are advised to first evaluate the impact of configuration changes
to the device and their security policy. Customers who are concerned about
undesired or unexpected side effects are advised to contact their support
organization before implementing configuration changes.
In addition, local exploitation of this vulnerability is possible if the
NX-OS features bash or guestshell are enabled. There is no workaround or
mitigation for a local attacker with valid device credentials; however,
customers are advised to follow best practices for account management as
outlined in the Cisco Guide to Securing NX-OS Software Devices - Use
Authentication, Authorization, and Accounting .
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories page , to determine exposure and a complete
upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco NX-OS Software
To help customers determine their exposure to vulnerabilities in Cisco
NX-OS Software, Cisco provides the Cisco Software Checker to identify any
Cisco Security Advisories that impact a specific Cisco NX-OS Software
release and the earliest release that fixes the vulnerabilities that are
described in each advisory ("First Fixed"). If applicable, the tool also
returns the earliest release that fixes all the vulnerabilities described
in all the advisories identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software, platform, and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories or one or more specific advisories.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by choosing the Cisco NX-OS
Software and platform and then entering a release-for example, 7.0(3)I7(5)
for Cisco Nexus 3000 Series Switches or 14.0(1h) for Cisco NX-OS Software
in ACI mode.
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker and check the Medium check box in the drop-down list
under Impact Rating when customizing a search.
Cisco Nexus 3000 and 9000 Series Switches SMUs
For Cisco Nexus 3000 and 9000 Series Switches, SMUs are available for Cisco
NX-OS Software Release 9.3(6). Customers can download the following SMU
from the Software Center on Cisco.com:
nxos.CSCvw89875-n9k_ALL-1.0.0-9.3.6.lib32_n9000.rpm.
For details about downloading and installing SMUs in Cisco NX-OS Software
for these Cisco Nexus Switches, see the Performing Software Maintenance
Upgrades section of the appropriate NX-OS system management configuration
guide:
Cisco Nexus 3000 Series Switches
Cisco Nexus 9000 Series Switches
Additional Resources
For help determining the best Cisco NX-OS Software release for a Cisco
Nexus Switch, see the following Recommended Releases documents. If a
security advisory recommends a later release, Cisco recommends following
the advisory guidance.
Cisco MDS Series Switches
Cisco Nexus 1000V for VMware Switch
Cisco Nexus 3000 Series Switches
Cisco Nexus 5500 Platform Switches
Cisco Nexus 5600 Platform Switches
Cisco Nexus 6000 Series Switches
Cisco Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches
Cisco Nexus 9000 Series ACI-Mode Switches
To determine the best release for Cisco UCS Software, see the Recommended
Releases documents in the release notes for the device.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank an anonymous reporter for finding this
vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Related to This Advisory
o Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security
Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-3000-9000-fileaction-QtLzDRy2
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-FEB-24 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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===========================================================================
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