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AUSCERT External Security Bulletin Redistribution
ESB-2020.1948
Cisco IOS, IOS XE, IOS XR, and NX-OS Software One Platform
Kit Remote Code Execution Vulnerability
4 June 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS, IOS XE, IOS XR, and NX-OS Software One Platform Kit
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3217
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco IOS, IOS XE, IOS XR, and NX-OS Software One Platform Kit Remote Code
Execution Vulnerability
Priority: High
Advisory ID: cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC
First Published: 2020 June 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvh10810 CSCvr80243 CSCvs42159 CSCvs42176 CSCvs81070
CVE-2020-3217
CWE-20
CVSS Score:
8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o
A vulnerability in the Topology Discovery Service of Cisco One Platform Kit
(onePK) in Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR
Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent
attacker to execute arbitrary code or cause a denial of service (DoS)
condition on an affected device.
The vulnerability is due to insufficient length restrictions when the onePK
Topology Discovery Service parses Cisco Discovery Protocol messages. An
attacker could exploit this vulnerability by sending a malicious Cisco
Discovery Protocol message to an affected device. An exploit could allow
the attacker to cause a stack overflow, which could allow the attacker to
execute arbitrary code with administrative privileges, or to cause a
process crash, which could result in a reload of the device and cause 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-ios-nxos-onepk-rce-6Hhyt4dC
This advisory is part of the June 3, 2020, release of the Cisco IOS and IOS
XE Software Security Advisory Bundled Publication, which includes 23 Cisco
Security Advisories that describe 25 vulnerabilities. For a complete list
of the advisories and links to them, see Cisco Event Response: June 2020
Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled
Publication .
Affected Products
o Vulnerable Products
This vulnerability affects Cisco products that are running a vulnerable
release of Cisco IOS, IOS XE, or IOS XR Software and have the onePK feature
enabled.
This vulnerability also affects the following Cisco products if they are
running a vulnerable release of Cisco NX-OS Software and have the onePK
feature enabled:
Nexus 3000 Series Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether the onePK Feature Is Configured
To determine whether the onePK feature is configured, administrators can
use the show onep status command in the CLI. The following example shows
the output of the show onep status command on a device that has the onePK
feature enabled:
device#show onep status
Status: enabled by: Config,Virtual-Service
.
.
.
If the command does not exist, the feature is not supported and the device
is not 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, which run Cisco FXOS Software:
Firepower 1000 Series
Firepower 2100 Series
Firepower 4100 Series
Firepower 9300 Security Appliances
Cisco has also confirmed that this vulnerability does not affect the
following Cisco products, which run Cisco NX-OS Software:
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
UCS 6400 Series Fabric Interconnects
Workarounds
o There are no workarounds that address this vulnerability.
However, customers who do not use the onePK feature are advised to disable
it to eliminate the attack surface. Administrators can disable the feature
by using the no onep command in global configuration mode. To determine
whether the onePK feature has been used since the last reload,
administrators can use the show onep statistics command.
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 and Alerts 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 IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
and IOS XE Software, Cisco provides the Cisco Software Checker to identify
any Cisco Security Advisories that impact a specific software release and
the earliest release that fixes the vulnerabilities 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 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, a specific advisory, or all advisories in
the most recent bundled publication.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE
Software release-for example, 15.1(4)M2 or 3.13.8S :
[ ] [Check]
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 on Cisco.com and check the Medium check box in the
drop-down list under Impact Rating when customizing a search.
For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
releases, refer to the Cisco IOS XE 2 Release Notes , Cisco IOS XE 3S
Release Notes , or Cisco IOS XE 3SG Release Notes , depending on the Cisco
IOS XE Software release.
Note: The onePK feature is not supported in Cisco IOS Software releases
later than Release 15.6(1)T or Cisco IOS XE Software releases later than
Release 3.17.2. However, the code is still present and the feature can
still be enabled.
Cisco IOS XR Software
The onePK feature is not supported in Cisco IOS XR Software releases 6.0
and later and cannot be enabled. Customers who are using Cisco IOS XR
Software Release 5.2 or 5.3 are advised to migrate to a later release.
Customers who are using a Cisco IOS XR Software release earlier than
Release 5.2 are not affected by this vulnerability.
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:
[Cisco NX-OS Software ] [MDS 9000 Series Multilayer Switches]
[ ] [Check]
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.
Note: While the onePK feature has never been supported in Cisco NX-OS
Software for Nexus 9000 Series Switches and is not supported in the
following Cisco NX-OS Software releases, the code is still present in these
releases and the feature could still be enabled:
Nexus 3000 Series Switches: 6.0(2)U4(1) through 7.0(3)I7(7)
Nexus 3500 Series Switches: 6.0(2)A4(1) through 7.0(3)I7(7)
Nexus 5500 and 5600 Platform Switches: 7.3 through 7.3(6)N1(1)
Nexus 6000 Series Switches: 7.3 through 7.3(6)N1(1)
Nexus 7000 Series Switches: 7.3(2)D1(1) through 8.4(1)
In the following Cisco NX-OS Software releases, all onePK code has been
removed:
Nexus 3000 and 9000 Series Switches: 7.0(3)I7(8) and later and 9.2(1)
and later
Nexus 5500 and 5600 Platform Switches: 7.3(7)N1(1) and later
Nexus 6000 Series Switches: 7.3(7)N1(1) and later
Nexus 7000 Series Switches: 8.4(2) and later
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 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: June 2020 Semiannual Cisco IOS and IOS XE Software
Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ios-nxos-onepk-rce-6Hhyt4dC
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-JUN-03 |
+----------+---------------------------+----------+--------+--------------+
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