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AUSCERT External Security Bulletin Redistribution
ESB-2024.1856
Cisco Access Point Software Secure Boot Bypass Vulnerability
28 March 2024
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AusCERT Security Bulletin Summary
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Product: Cisco Access Point (AP) Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2024-20265
Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-secureboot-bypass-zT5vJkSD
Comment: CVSS (Max): 5.9 CVE-2024-20265 (CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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Cisco Access Point Software Secure Boot Bypass Vulnerability
Priority: High
Advisory ID: cisco-sa-ap-secureboot-bypass-zT5vJkSD
First Published: 2024 March 27 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwf62026
CVE Names: CVE-2024-20265
CWEs: CWE-501
Summary
o A vulnerability in the boot process of Cisco Access Point (AP) Software
could allow an unauthenticated, physical attacker to bypass the Cisco
Secure Boot functionality and load a software image that has been tampered
with on an affected device.
This vulnerability exists because unnecessary commands are available during
boot time at the physical console. An attacker could exploit this
vulnerability by interrupting the boot process and executing specific
commands to bypass the Cisco Secure Boot validation checks and load an
image that has been tampered with. This image would have been previously
downloaded onto the targeted device. A successful exploit could allow the
attacker to load the image once. The Cisco Secure Boot functionality is not
permanently compromised.
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-secureboot-bypass-zT5vJkSD
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are 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
Business 100 Series APs and Mesh Extenders
Business 200 Series APs
Catalyst 9105AX Series APs
Catalyst 9115 Series APs
Catalyst 9120AX Series APs
Catalyst 9124AX Series APs
Catalyst 9130AX Series APs
Catalyst 9136 Series APs
Catalyst Cellular Gateways
Catalyst IW6300 Heavy Duty Series APs
Wide Pluggable Form Factor Wi-Fi 6 AP Module for Industrial Routers
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 this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Aironet 1530 Series APs
Aironet 1550 Series APs
Aironet 1570 Series APs
Catalyst 9162 Series APs
Catalyst 9164 Series APs
Catalyst 9166 Series APs
IOS XR Software
Meraki products
NX-OS Software
Small Business Wireless APs
Wireless LAN Controller (WLC) Software
Cisco has also 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 Cisco has released free software updates that address the vulnerability
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
In the following tables, the left column lists Cisco software releases. The
right column indicates whether a release is affected by the vulnerability
that is described in this advisory and the first release that includes the
fix for this vulnerability.
The process to upgrade an AP requires upgrading the wireless controller to
which the AP is registered. Customers are advised to upgrade to an
appropriate fixed software release as indicated in this section.
APs Managed by WLC or Mobility Express (ME)
Cisco Wireless LAN Controller Software First Fixed Release
Release
8.9 and earlier Migrate to a fixed release.
8.10 8.10.190.0
APs Managed by Catalyst 9800 Series Wireless Controller or Embedded
Wireless Controller (EWC)
Cisco Catalyst 9800 Series Wireless First Fixed Release
Controller Software Release
17.2 and earlier Migrate to fixed release.
17.3 17.3.8
17.4 Migrate to fixed release.
17.5 Migrate to fixed release.
17.6 17.6.6
17.7 Migrate to fixed release.
17.8 Migrate to fixed release.
17.9 17.9.4
17.10 Migrate to fixed release.
17.11 Migrate to fixed release.
17.12 Not vulnerable.
Business 140, 141, 142, 143, 145, and 240 APs and Mesh Extenders
Cisco Business Wireless AP Software Release First Fixed Release
10.8.1 and earlier Migrate to fixed release.
10.9.1 10.9.1.0
Business 150 and 151 APs and Mesh Extenders
Cisco Business Wireless AP Software Release First Fixed Release
10.5.2 and earlier Migrate to fixed release.
10.6.2 10.6.2.0
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 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-secureboot-bypass-zT5vJkSD
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2024-MAR-27 |
+----------+---------------------------+----------+--------+--------------+
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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