CVE-2020-27347 tmux stack buffer overflow in function input_csi_dispatch_sgr_colon
A stack-based buffer overflow in tmux allows attackers to execute arbitrary code via malicious terminal output.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-27347?
CVE-2020-27347 is a high-severity memory corruption vulnerability in Ubuntu tmux, published on 6 Nov 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In tmux before version 3.1c the function input_csi_dispatch_sgr_colon() in file input.c contained a stack-based buffer-overflow that can be exploited by terminal output.
Which versions are affected by CVE-2020-27347?
It affects 1 product.
Products include Tmux Project Tmux.
How do I fix CVE-2020-27347?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-27347 being exploited?
There is no known exploitation of CVE-2020-27347 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as ALPINE-CVE-2020-27347, DEBIAN-CVE-2020-27347, GHSA-xp5q-c655-9565, JLSEC-2026-528, UBUNTU-CVE-2020-27347, USN-4618-1.