CVE-2021-34788 Race condition in Cisco AnyConnect Secure Mobility Client
Local authenticated attackers can execute arbitrary code with root privileges via a race condition in shared library loading if the HostScan module is installed.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34788?
CVE-2021-34788 is a high-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 6 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the shared library loading mechanism of Cisco AnyConnect Secure Mobility Client for Linux and Mac OS could allow an authenticated, local attacker to perform a shared library hijacking attack on an affected device if the VPN Posture (HostScan) Module is installed on the AnyConnect client. This vulnerability is due to a race condition in the signature verification process for shared library files that are loaded on an affected device. An attacker could exploit this vulnerability by sending a series of crafted interprocess communication (IPC) messages to the AnyConnect process. A successful exploit could allow the attacker to execute arbitrary code on the affected device with root privileges. To exploit this vulnerability, the attacker must have a valid account on the system.
Weakness: CWE-367
Which versions are affected by CVE-2021-34788?
It affects 1 product.
Products include Cisco Anyconnect Secure Mobility Client.
How do I fix CVE-2021-34788?
No fix has been published for CVE-2021-34788 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-34788 being exploited?
There is no known exploitation of CVE-2021-34788 in the wild and no public exploit code.
Other vulnerabilities in Cisco Anyconnect Secure Mobility Client
Sources
Also known as GHSA-mh72-74m7-v766.