CVE-2019-3902: debian debian_linux Path Traversal

Vulnerability summary

CVE-2019-3902 is a medium (CVSS 5.9) Path Traversal vulnerability in debian debian_linux. EPSS estimates a 1.43% chance of exploitation in the next 30 days, higher than 72.5% of scored vulnerabilities.

Timeline

1. 22-04-2019
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

A flaw was found in Mercurial before 4.9. It was possible to use symlinks and subrepositories to defeat Mercurial's path-checking logic and write files outside a repository.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
• CWE-59Improper Link Resolution Before File Access ('Link Following')The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.