CVE-2021-36809 Path traversal in SSL VPN client
A local attacker with administrator privileges can overwrite arbitrary system files via VPN client logs, causing denial of service and data loss.
- 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-2021-36809?
CVE-2021-36809 is a medium-severity path traversal vulnerability in Sophos SSL VPN client, published on 7 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A local attacker can overwrite arbitrary files on the system with VPN client logs using administrator privileges, potentially resulting in a denial of service and data loss, in all versions of Sophos SSL VPN client.
Which versions are affected by CVE-2021-36809?
It affects 1 product.
Products include Sophos Ssl Vpn Client.
How do I fix CVE-2021-36809?
No fix has been published for CVE-2021-36809 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-36809 being exploited?
There is no known exploitation of CVE-2021-36809 in the wild and no public exploit code.
Sources
Also known as GHSA-c7p5-h3xc-723m.