CVE-2018-20535 Use after free in n/a

Medium 5.5 Published 28 Dec 2018 Updated 5 Aug 2024

A use-after-free vulnerability in Netwide Assembler allows attackers to cause a denial of service via crafted input.

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-2018-20535?

CVE-2018-20535 is a medium-severity use after free vulnerability in Nasm Netwide Assembler, published on 28 Dec 2018. 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

There is a use-after-free at asm/preproc.c (function pp_getline) in Netwide Assembler (NASM) 2.14rc16 that will cause a denial of service during a line-number increment attempt.

Weakness: CWE-416

Which versions are affected by CVE-2018-20535?

It affects 1 product.

Products include Nasm Netwide Assembler.

How do I fix CVE-2018-20535?

Upgrade to a fixed version.

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-2018-20535 being exploited?

There is no known exploitation of CVE-2018-20535 in the wild and no public exploit code.

All Nasm Netwide Assembler vulnerabilities

Sources

Also known as DEBIAN-CVE-2018-20535, GHSA-rvm6-q4p6-g665, UBUNTU-CVE-2018-20535.