CVE-2018-14600 Memory corruption in n/a

Critical 9.8 Published 24 Aug 2018 Updated 5 Aug 2024

A signedness error in libX11 allows out-of-bounds writes, enabling remote code execution or denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2018-14600?

CVE-2018-14600 is a critical memory corruption vulnerability in Canonical Ubuntu Linux, published on 24 Aug 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

Weakness: CWE-787

Which versions are affected by CVE-2018-14600?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, X.org Libx11.

How do I fix CVE-2018-14600?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2018-14600 being exploited?

There is no known exploitation of CVE-2018-14600 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as ALPINE-CVE-2018-14600, DEBIAN-CVE-2018-14600, GHSA-8j8v-r4qq-96r9, UBUNTU-CVE-2018-14600.