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Advisories

Hermes WebUI < 0.51.303 TOCTOU Race Condition via git_discard

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severity
medium
date
Affecting

  • Hermes WebUI < 0.51.303

CWE
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CVSS
4.3
CVSS V4 Vector
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
Credit
Chia Min Jun Lennon
Description
Hermes WebUI before version 0.51.303 contains a time-of-check time-of-use (TOCTOU) race condition vulnerability in the git_discard function within api/workspace_git.py that allows attackers to delete files outside the configured workspace boundary by replacing a validated path component with a symlink after validation but before deletion. Attackers can substitute a workspace-controlled path component with a symlink pointing to an external directory between the safe_resolve_ws() validation step and the subsequent Path.unlink() or shutil.rmtree() deletion call, causing the delete operation to follow the symlink and remove arbitrary files outside the workspace.

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