Privilege escalation in Cisco AnyConnect Secure Mobility Client for Linux and Mac OS

1) Time-of-check Time-of-use (TOCTOU) Race Condition

EUVDB-ID: #VU57124

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34788

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Exploit availability: No

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco AnyConnect Secure Mobility Client: before 4.10.03104

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-anyconnect-lib-hija-cAFB7x4q

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.