CVE-2018-20969 Command injection in n/a
GNU patch fails to block ed script commands starting with an exclamation mark, allowing attackers to execute arbitrary commands via crafted patches.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2018-20969?
CVE-2018-20969 is a high-severity command injection vulnerability in n/a, published on 16 Aug 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the same commit as for CVE-2019-13638, but the ! syntax is specific to ed, and is unrelated to a shell metacharacter.
Weakness: CWE-78
Which versions are affected by CVE-2018-20969?
It affects 1 product.
Products include Gnu Patch.
How do I fix CVE-2018-20969?
Apply the vendor's patch.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2018-20969 being exploited?
There is no known exploitation of CVE-2018-20969 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as ALPINE-CVE-2018-20969, AZL-35102, AZL-6786, CLEANSTART-2026-JU77269, DEBIAN-CVE-2018-20969, GHSA-g5pm-269j-95rr and 2 more.