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AUSCERT External Security Bulletin Redistribution
ESB-2022.2043
Cisco Enterprise NFV Infrastructure Software Vulnerabilities
5 May 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Enterprise NFVIS
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20780 CVE-2022-20779 CVE-2022-20777
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-NFVIS-MUL-7DySRX9
Comment: CVSS (Max): 9.9 CVE-2022-20779 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
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Cisco Enterprise NFV Infrastructure Software Vulnerabilities
Priority: Critical
Advisory ID: cisco-sa-NFVIS-MUL-7DySRX9
First Published: 2022 May 4 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvz73971 CSCvz73973 CSCvz73988
CVE Names: CVE-2022-20777 CVE-2022-20779 CVE-2022-20780
CWEs: CWE-284 CWE-611
Summary
o Multiple vulnerabilities in Cisco Enterprise NFV Infrastructure Software
(NFVIS) could allow an attacker to escape from the guest virtual machine
(VM) to the host machine, inject commands that execute at the root level,
or leak system data from the host to the VM.
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-NFVIS-MUL-7DySRX9
Affected Products
o Vulnerable Products
These vulnerabilities affect Cisco Enterprise NFVIS in the default
configuration.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit another vulnerability. In
addition, a software release that is affected by one of the vulnerabilities
may not be affected by the other vulnerabilities.
Details about the vulnerabilities are as follows:
Cisco Enterprise NFVIS Guest Escape Vulnerability
A vulnerability in the Next Generation Input/Output (NGIO) feature of Cisco
Enterprise NFVIS could allow an authenticated, remote attacker to escape
from the guest VM to gain unauthorized root -level access on the NFVIS
host.
This vulnerability is due to insufficient guest restrictions. An attacker
could exploit this vulnerability by sending an API call from a VM that will
execute with root -level privileges on the NFVIS host. A successful exploit
could allow the attacker compromise the NFVIS host completely.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz73973
CVE ID: CVE-2022-20777
Security Impact Rating (SIR): Critical
CVSS Base Score: 9.9
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Cisco Enterprise NFVIS Command Injection Vulnerability
A vulnerability in the image registration process of Cisco Enterprise NFVIS
could allow an unauthenticated, remote attacker to inject commands that
execute at the root level on the NFVIS host during the image registration
process.
This vulnerability is due to improper input validation. An attacker could
exploit this vulnerability by persuading an administrator on the host
machine to install a VM image with crafted metadata that will execute
commands with root- level privileges during the VM registration process. A
successful exploit could allow the attacker to inject commands with root
-level privileges into the NFVIS host.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz73988
CVE ID: CVE-2022-20779
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Cisco Enterprise NFVIS XML External Entity Injection Vulnerability
A vulnerability in the import function of Cisco Enterprise NFVIS could
allow an unauthenticated, remote attacker to leak system data from the host
to any configured VM.
This vulnerability is due to the resolution of external entities in the XML
parser. An attacker could exploit this vulnerability by persuading an
administrator to import a crafted file that will read data from the host
and write it to any configured VM. A successful exploit could allow the
attacker to access system information from the host, such as files
containing user data, on any configured VM.
Note: An attacker who already has authenticated access on a VM that is
configured within the NFVIS host could obtain direct access to the
confidential system information.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvz73971
CVE ID: CVE-2022-20780
Security Impact Rating (SIR): High
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
Workarounds
o There are no workarounds that address these vulnerabilities.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
described in this advisory. Customers with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
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.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table(s):
Cisco Enterprise NFVIS Release First Fixed Release
Earlier than 4.0 Migrate to a fixed release.
4.0 4.7.1
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerabilities that are described in this advisory.
Source
o Cisco would like to thank Cyrille Chatras, Pierre Denouel, and Loic Restoux
of Orange Group for reporting these vulnerabilities.
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-NFVIS-MUL-7DySRX9
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-MAY-04 |
+----------+---------------------------+----------+--------+--------------+
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