CVE-2021-29627 Use after free in FreeBSD
A use-after-free vulnerability in FreeBSD's listening socket accept filters allows attackers to potentially execute arbitrary code or escalate privileges.
- 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-2021-29627?
CVE-2021-29627 is a high-severity use after free vulnerability in Freebsd Freebsd, published on 7 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In FreeBSD 13.0-STABLE before n245050, 12.2-STABLE before r369525, 13.0-RC4 before p0, and 12.2-RELEASE before p6, listening socket accept filters implementing the accf_create callback incorrectly freed a process supplied argument string. Additional operations on the socket can lead to a double free or use after free.
Which versions are affected by CVE-2021-29627?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2021-29627?
No fix has been published for CVE-2021-29627 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-29627 being exploited?
There is no known exploitation of CVE-2021-29627 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-g6p6-whf8-4cqg.