ESB-2023.3274.4 – UPDATE [Win] AnyConnect Secure Mobility Client and Secure Client: CVSS (Max): 7.8 [auscert.org.au]

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AUSCERT External Security Bulletin Redistribution

ESB-2023.3274.4
Cisco AnyConnect Secure Mobility Client Software for Windows and Cisco
Secure Client Software for Windows Privilege Escalation Vulnerability
10 July 2023

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AusCERT Security Bulletin Summary
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Product: AnyConnect Secure Mobility Client Software
Secure Client Software
Publisher: Cisco Systems
Operating System: Windows
Resolution: Patch/Upgrade
CVE Names: CVE-2023-20178

Original Bulletin:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ac-csc-privesc-wx4U4Kw

Comment: CVSS (Max): 7.8 CVE-2023-20178 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:U/C:H/I:H/A:H

Revision History: July 10 2023: Vendor updated not vulnerable products list
June 26 2023: Cisco PSIRT is aware of available proof-of-concept exploit code for the described vulnerability
June 9 2023: Vendor updated fixed release information
June 8 2023: Initial Release

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Cisco AnyConnect Secure Mobility Client Software for Windows and Cisco Secure
Client Software for Windows Privilege Escalation Vulnerability

Priority: High
Advisory ID: cisco-sa-ac-csc-privesc-wx4U4Kw
First Published: 2023 June 7 16:00 GMT
Last Updated: 2023 July 5 16:20 GMT
Version 1.4: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwe00252
CVE Names: CVE-2023-20178

Summary

o A vulnerability in the client update process of Cisco AnyConnect Secure
Mobility Client Software for Windows and Cisco Secure Client Software for
Windows could allow a low-privileged, authenticated, local attacker to
elevate privileges to those of SYSTEM. The client update process is
executed after a successful VPN connection is established.

This vulnerability exists because improper permissions are assigned to a
temporary directory that is created during the update process. An attacker
could exploit this vulnerability by abusing a specific function of the
Windows installer process. A successful exploit could allow the attacker to
execute code with SYSTEM privileges.

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-ac-csc-privesc-wx4U4Kw

Attention: Simplifying the Cisco portfolio includes the renaming of
security products under one brand: Cisco Secure. For more information, see
Meet Cisco Secure .

Affected Products

o Vulnerable Products

This vulnerability affects Cisco AnyConnect Secure Mobility Client Software
for Windows and Cisco Secure Client Software for Windows.

Note: For releases earlier than Release 5.0, Cisco Secure Client for
Windows is known as Cisco AnyConnect Secure Mobility Client for Windows.

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
products:

Cisco AnyConnect Secure Mobility Client for Linux
Cisco AnyConnect Secure Mobility Client for MacOS
Cisco AnyConnect Secure Mobility Client for Universal Windows Platform
Cisco Secure Client-AnyConnect for Android
Cisco Secure Client AnyConnect VPN for iOS
Cisco Secure Client (including AnyConnect) for Universal Windows
Platform
Cisco Secure Client for Linux
Cisco Secure Client for MacOS

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. Customers are advised to upgrade to an
appropriate fixed software release as indicated in this section.

Cisco AnyConnect Secure Mobility Client for Windows First Fixed
Software Release
4.10 and earlier 4.10MR7
(4.10.07061)

Cisco Secure Client for Windows Software First Fixed Release
5.0 5.0MR2 (5.0.02075)

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 aware that proof-of-concept exploit code is available
for the vulnerability that is described in this advisory.

Source

o Cisco would like to thank Filip Dragovic for reporting this vulnerability.

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

URL

o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ac-csc-privesc-wx4U4Kw

Revision History

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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