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AUSCERT External Security Bulletin Redistribution
ESB-2023.1130
Cisco FXOS Software and UCS Manager Software Configuration
Backup Static Key Vulnerability
23 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: FXOS Software
UCS Manager Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20016
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA
Comment: CVSS (Max): 6.3 CVE-2023-20016 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
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Cisco FXOS Software and UCS Manager Software Configuration Backup Static Key
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ucsm-bkpsky-H8FCQgsA
First Published: 2023 February 22 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvm53827 CSCwc01592
CVE Names: CVE-2023-20016
Summary
o A vulnerability in the backup configuration feature of Cisco UCS Manager
Software and in the configuration export feature of Cisco FXOS Software
could allow an unauthenticated attacker with access to a backup file to
decrypt sensitive information stored in the full state and configuration
backup files.
This vulnerability is due to a weakness in the encryption method used for
the backup function. An attacker could exploit this vulnerability by
leveraging a static key used for the backup configuration feature. A
successful exploit could allow the attacker to decrypt sensitive
information that is stored in full state and configuration backup files,
such as local user credentials, authentication server passwords, Simple
Network Management Protocol (SNMP) community names, and other credentials.
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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA
This advisory is part of the February 2023 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 2023
Semiannual 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 FXOS or Cisco UCS Manager Software:
Firepower 4100 Series
Firepower 9300 Security Appliances
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
UCS 6500 Series Fabric Interconnects
Note: Cisco FXOS Software releases 2.6.1 and later are not affected by this
vulnerability. Only versions earlier than Release 2.6.1 are vulnerable.
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.
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:
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 ACI mode
Nexus 9000 Series Switches in standalone NX-OS mode
Secure Firewall 3100 Series
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 FXOS Software
To help customers determine their exposure to vulnerabilities in Cisco FXOS
Software, Cisco provides the Cisco Software Checker . This tool identifies
any Cisco security advisories that impact a specific 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 that are described in
all the advisories that the Software Checker identifies ("Combined First
Fixed").
To use the tool, go to the Cisco Software Checker page and follow the
instructions. Alternatively, use the following form to search for
vulnerabilities that affect a specific software release. To use the form,
follow these steps:
1. Choose which advisories the tool will search-only this advisory, only
advisories with a Critical or High Security Impact Rating (SIR) , or
all advisories.
2. Choose the appropriate platform.
3. Enter a release number-for example, 2.9.1.158 for Cisco Firepower 4100
Series Security Appliances.
4. Click Check .
Cisco UCS Software
At the time of publication, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability described in
this advisory and which release included the fix for this vulnerability.
Cisco UCS Software Release First Fixed Release
Earlier than 4.0 Migrate to a fixed release.
4.0 Migrate to a fixed release.
4.1 Migrate to a fixed release.
4.2 4.2(3c)
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 vulnerability that is described in this advisory.
Source
o Cisco would like to thank the following security researchers for
independently reporting this vulnerability:
Odd Rune Dahle of the Norwegian Tax Authority
Nate McDonald, Senior Security Consultant of GreenPages
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.
Subscribe to Cisco Security Notifications
o Subscribe
Related to This Advisory
o Cisco Event Response: February 2023 Semiannual Cisco FXOS and NX-OS
Software Security Advisory Bundled Publication
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsm-bkpsky-H8FCQgsA
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2023-FEB-22 |
+----------+---------------------------+----------+--------+--------------+
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