CVE-2021-1567 Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability
Local attackers can execute arbitrary code with SYSTEM privileges via DLL hijacking in Cisco AnyConnect 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-2021-1567?
CVE-2021-1567 is a high-severity vulnerability in Cisco Anyconnect Secure Mobility Client, published on 16 Jun 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 DLL loading mechanism of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL 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 DLL 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 SYSTEM privileges. To exploit this vulnerability, the attacker must have valid credentials on the Windows system.
Which versions are affected by CVE-2021-1567?
It affects 1 product.
Products include Cisco Anyconnect Secure Mobility Client.
How do I fix CVE-2021-1567?
No fix has been published for CVE-2021-1567 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-1567 being exploited?
There is no known exploitation of CVE-2021-1567 in the wild and no public exploit code.
Other vulnerabilities in Cisco Anyconnect Secure Mobility Client
Sources
Also known as GHSA-wxfr-9v84-73vc.