CVE-2021-21815 Memory corruption in AT&T

High 7.8 Published 13 Aug 2021 Updated 3 Aug 2024

A stack-based buffer overflow in Xmill allows attackers to execute arbitrary code via malicious command-line arguments.

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-2021-21815?

CVE-2021-21815 is a high-severity memory corruption vulnerability in AT&T, published on 13 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A stack-based buffer overflow vulnerability exists in the command-line-parsing HandleFileArg functionality of AT&T Labs' Xmill 0.7. Within the function HandleFileArg the argument filepattern is under control of the user who passes it in from the command line. filepattern is passed directly to strcpy copying the path provided by the user into a staticly sized buffer without any length checks resulting in a stack-buffer overflow. An attacker can provide malicious input to trigger this vulnerability.

Weakness: CWE-787

Which versions are affected by CVE-2021-21815?

It affects 1 product.

Products include Att Xmill.

How do I fix CVE-2021-21815?

No fix has been published for CVE-2021-21815 yet. Limit exposure of the affected software until one is available.

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

Is CVE-2021-21815 being exploited?

There is no known exploitation of CVE-2021-21815 in the wild and no public exploit code.

Sources

Also known as GHSA-8vmp-q2rf-gr57.