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: 7.3 [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]
CVE-ID: CVE-2021-34788
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Cisco AnyConnect Secure Mobility Client
How to mitigate CVE-2021-34788
Install updates from vendor's website.
Cisco AnyConnect Secure Mobility Client - update to 4.10.03104