CVE-2021-21812: att xmill Out-of-bounds Write

Vulnerability summary

CVE-2021-21812 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in att xmill. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 25.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 13-08-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

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 static sized buffer without any length checks resulting in a stack-buffer overflow. An attacker can provide malicious input to trigger these vulnerabilities.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.