Cisco Security Advisory
Cisco AnyConnect Secure Mobility Client Denial of Service Vulnerability
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CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
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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.
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-anyconnect-dos-55AYyxYr
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Vulnerable Products
At the time of publication, this vulnerability affected all releases earlier than 4.10.00093 of the following Cisco products:
- AnyConnect Secure Mobility Client for Windows
- AnyConnect Secure Mobility Client for MacOS
- 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.
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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.
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There are no workarounds that address this vulnerability.
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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, Cisco AnyConnect Secure Mobility Client releases 4.10.00093 and later contained the fix for this vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
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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.
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Cisco would like to thank Gerbert Roitburd of Secure Mobile Networking Lab (TU Darmstadt) for reporting this vulnerability.
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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.
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Show LessVersion Description Section Status Date 1.2 Added fixed release information. Summary, Vulnerable Products, and Fixed Releases Final 2021-APR-14 1.1 Updated Windows and MacOS information. Affected Products, Vulnerable Products Interim 2021-FEB-25 1.0 Initial public release. - Interim 2021-FEB-24
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