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Made with love by Amit Schendel & Alon Barad

CVE-2024-56731

Gogs RCE: The Symlink That Killed the Patch (CVE-2024-56731)

Amit Schendel
Amit Schendel
Senior Security Researcher

Jan 1, 2026·4 min read·156 visits

Executive Summary (TL;DR)

Gogs tried to stop hackers from deleting `.git` files by checking file names. Hackers bypassed this by using symbolic links (e.g., `evil_link` -> `.git/config`). By editing the symlink via the Web UI, attackers can overwrite Git hooks and achieve full RCE. CVSS 10.0.

A critical Remote Command Execution vulnerability in Gogs versions prior to 0.13.3. This flaw is a bypass of a previous fix (CVE-2024-39931), allowing authenticated users to overwrite internal Git files via symbolic links.

Official Patches

GogsGogs v0.13.3 Release Notes

Fix Analysis (1)

Technical Appendix

CVSS Score
10.0/ 10
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS Probability
0.42%
Top 88% most exploited
45,000
via Shodan

Affected Systems

Gogs (Self-Hosted Git Service)

Affected Versions Detail

Product
Affected Versions
Fixed Version
Gogs
Gogs
< 0.13.30.13.3
AttributeDetail
CWECWE-59 (Link Following)
Attack VectorNetwork (Authenticated)
CVSS10.0 (Critical)
ImpactRemote Command Execution (RCE)
PrivilegesLow (Any authenticated user)
Fix Version0.13.3

MITRE ATT&CK Mapping

T1559Inter-Process Communication
Execution
T1202Indirect Command Execution
Defense Evasion
CWE-59
Link Following

Improper Link Resolution Before File Access ('Link Following')

Known Exploits & Detection

GitHubDiscussion regarding the symlink bypass and initial disclosure

Vulnerability Timeline

Original flaw CVE-2024-39931 disclosed
2024-07-01
Bypass discovered and patched in commit 1cba9bc
2024-12-25
Gogs v0.13.3 Released
2024-12-27

References & Sources

  • [1]Fix Commit
  • [2]NIST NVD Entry
Related Vulnerabilities
CVE-2024-39931

Attack Flow Diagram

Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.

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