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AUSCERT External Security Bulletin Redistribution
ESB-2021.0702.2
Cisco AnyConnect Secure Mobility Client Denial of Service Vulnerability
26 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: AnyConnect Secure Mobility Client
Publisher: Cisco Systems
Operating System: Linux variants
Mac OS
Windows
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1450
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-55AYyxYr
Revision History: February 26 2021: Vendor confirmed Windows and MacOS version are also vulnerable.
February 25 2021: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco AnyConnect Secure Mobility Client Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-anyconnect-dos-55AYyxYr
First Published: 2021 February 24 16:00 GMT
Last Updated: 2021 February 25 23:23 GMT
Version 1.1: Interim
Workarounds: No workarounds available
Cisco Bug IDs: CSCvw29572
CVE Names: CVE-2021-1450
CWEs: CWE-20
Summary
o A vulnerability in the interprocess communication (IPC) channel of Cisco
AnyConnect Secure Mobility Client could allow an authenticated, local
attacker to cause a denial of service (DoS) condition on an affected
device. To exploit this vulnerability, the attacker would need to have
valid credentials on the device.
The vulnerability is due to insufficient validation of user-supplied input.
An attacker could exploit this vulnerability by sending one or more crafted
IPC messages to the AnyConnect process on an affected device. A successful
exploit could allow the attacker to stop the AnyConnect process, causing a
DoS condition on the device.
Note: The process under attack will automatically restart so no action is
needed by the user or admin.
There are no workarounds that address this vulnerability.
The vulnerability described in this advisory is still under investigation.
Cisco will update this advisory as needed, when additional information
becomes available.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-55AYyxYr
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected all versions of the
following products:
Cisco AnyConnect Secure Mobility Client for Windows
Cisco AnyConnect Secure Mobility Client for MacOS
Cisco AnyConnect Secure Mobility Client for Linux
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 Cisco
AnyConnect Secure Mobility Client for the Apple iOS, Android, and Universal
Windows platforms.
Details
o This vulnerability cannot be exploited remotely because it requires the
attacker to have local credentials on the end-user device in order to take
action on the local system.
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
For information about fixed software releases, see the Details section in
the bug ID(s) at the top of this advisory.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is aware that
proof-of-concept exploit code is available for the vulnerability described
in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that
is described in this advisory.
Source
o Cisco would like to thank Gerbert Roitburd of Secure Mobile Networking Lab
(TU Darmstadt) 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-dos-55AYyxYr
Revision History
o +---------+-------------------+-------------------+---------+-------------+
| Version | Description | Section | Status | Date |
+---------+-------------------+-------------------+---------+-------------+
| | Updated Windows | Affected | | |
| 1.1 | and MacOS | Products, | Interim | 2021-FEB-25 |
| | information. | Vulnerable | | |
| | | Products | | |
+---------+-------------------+-------------------+---------+-------------+
| 1.0 | Initial public | - | Interim | 2021-FEB-24 |
| | release. | | | |
+---------+-------------------+-------------------+---------+-------------+
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