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How the CVE Works
The vulnerability exists in GitProxy’s push parser (parsePush.ts), which fails to properly validate multi-branch pushes. When a user pushes multiple branches simultaneously, only the first branch undergoes policy checks and approval, while subsequent branches bypass validation. This occurs because the parser processes only the first branch reference (refUpdates) and silently ignores the rest. Attackers or even legitimate users can exploit this by pushing an approved branch alongside an unapproved one containing malicious code or secrets. The fix enforces strict single-branch push validation, blocking any push containing multiple branch updates.
DailyCVE Form
Platform: GitProxy
Version: Pre-2.8.4
Vulnerability: Policy bypass
Severity: High
Date: 2023-10-15
Prediction: Patch expected by 2023-11-01
What Undercode Say
git push proxy safe-branch bad-branch Exploit command
if (refUpdates.length !== 1) { // Fix code
step.setError('Blocked: Multi-branch push.');
}
How Exploit
1. Push approved + unapproved branches.
2. Second branch skips checks.
Protection from this CVE
- Update to GitProxy 2.8.4+.
- Enforce single-branch pushes.
Impact
- Unauthorized code injection.
- Secrets leakage.
- Policy enforcement failure.
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
