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AUSCERT External Security Bulletin Redistribution
ESB-2023.1716
Cisco Access Point Software Denial of Service Vulnerability
23 March 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Catalyst Series APs
Aironet Series APs
Embedded Services APs
Integrated APs
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20056
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-cli-dos-tc2EKEpu
Comment: CVSS (Max): 6.5 CVE-2023-20056 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
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Cisco Access Point Software Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ap-cli-dos-tc2EKEpu
First Published: 2023 March 22 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwc61122
CVE Names: CVE-2023-20056
Summary
o A vulnerability in the management CLI of Cisco access point (AP) software
could allow an authenticated, local attacker to cause a denial of service
(DoS) condition on an affected device.
This vulnerability is due to insufficient input validation of commands
supplied by the user. An attacker could exploit this vulnerability by
authenticating to a device and submitting crafted input to the affected
command. A successful exploit could allow the attacker to cause an affected
device to reload spontaneously, 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-cli-dos-tc2EKEpu
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable software release:
6300 Series Embedded Services APs
Aironet 1540 Series APs
Aironet 1560 Series APs
Aironet 1800 Series APs
Aironet 2800 Series APs
Aironet 3800 Series APs
Aironet 4800 APs
Catalyst 9100 APs
Catalyst IW6300 Heavy Duty Series APs
Integrated APs on 1100 Integrated Services Routers (ISRs)
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 any Cisco AP
series that is not listed in the Vulnerable Products section of this
advisory.
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.
Fixed Releases
At the time of publication, the release information in the following tables
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 that is
described in this advisory and which release included the fix for this
vulnerability.
APs Managed by Wireless LAN Controller (WLC) or Mobility Express (ME)
Cisco Wireless LAN Controller Software Release First Fixed Release
8.9 and earlier Migrate to a fixed release.
8.10 8.10.181.0 ^1
1. Release 8.10.181.0 has been deferred. Cisco recommends upgrading to
Release 8.10.183.0.
APs Managed by Catalyst 9800 Series Wireless Controller or Embedded
Wireless Controller (EWC)
Cisco Catalyst 9800 Series Wireless Controller First Fixed Release
Software Release
16.11 and earlier Migrate to a fixed
release.
16.12 16.12.8
17.1 Migrate to a fixed
release.
17.2 Migrate to a fixed
release.
17.3 17.3.6
17.4 Migrate to a fixed
release.
17.5 Migrate to a fixed
release.
17.6 17.6.5
17.7 Migrate to a fixed
release.
17.8 Migrate to a fixed
release.
17.9 17.9.2
17.10 and later Not vulnerable.
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 This vulnerability was found by Matthew Street of Cisco 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.
Subscribe to Cisco Security Notifications
o Subscribe
Related to This Advisory
o
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-cli-dos-tc2EKEpu
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2023-MAR-22 |
+----------+---------------------------+----------+--------+--------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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