Time-of-check Time-of-use (TOCTOU) Race Condition in Cisco AnyConnect Secure Mobility Client - CVE-2021-34788

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Main Vulnerability Database Vulnerabilities #VU57124

Time-of-check Time-of-use (TOCTOU) Race Condition in Cisco AnyConnect Secure Mobility Client - CVE-2021-34788

Published: October 7, 2021


Vulnerability identifier: #VU57124
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-34788
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco AnyConnect Secure Mobility Client

Detailed vulnerability description

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to a race condition in the signature verification process for shared library files that are loaded on an affected device. A local user can send a series of crafted interprocess communication (IPC) messages and execute arbitrary code on the target device with root privileges.


How to mitigate CVE-2021-34788

Install updates from vendor's website.

Sources