CVE-2021-29417
📋 TL;DR
CVE-2021-29417 is a critical directory traversal vulnerability in gitjacker versions before 0.1.0 that allows remote attackers to execute arbitrary code by exploiting a crafted .git directory. This affects systems running vulnerable versions of gitjacker, particularly those used for security testing or Git repository analysis. Attackers can leverage this to achieve remote code execution on affected systems.
💻 Affected Systems
- gitjacker
📦 What is this software?
Gitjacker by Gitjacker Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, lateral movement, or deployment of ransomware.
Likely Case
Remote code execution allowing attackers to run arbitrary commands, steal sensitive data, or use the system as a foothold for further attacks.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Exploitation requires the attacker to control or manipulate a .git directory that gitjacker processes, making it particularly dangerous when scanning untrusted targets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.1.0
Vendor Advisory: https://github.com/liamg/gitjacker/releases/tag/v0.1.0
Restart Required: No
Instructions:
1. Stop using gitjacker. 2. Update to version 0.1.0 or later using 'go get github.com/liamg/gitjacker@v0.1.0' or download from GitHub releases. 3. Verify the update with 'gitjacker --version'.
🔧 Temporary Workarounds
Disable gitjacker usage
allCompletely stop using gitjacker until patched to prevent exploitation.
sudo rm /usr/local/bin/gitjacker
Remove any gitjacker binaries from system
Restrict network access
allLimit gitjacker to trusted networks only and avoid scanning untrusted targets.
Use firewall rules to restrict outbound connections from systems running gitjacker
🧯 If You Can't Patch
- Isolate systems running gitjacker in a restricted network segment with no internet access
- Implement strict input validation and monitoring for any gitjacker execution attempts
🔍 How to Verify
Check if Vulnerable:
Run 'gitjacker --version' and check if version is below 0.1.0. If command not found, check installed binaries for gitjacker.Check Version:
gitjacker --versionVerify Fix Applied:
Run 'gitjacker --version' and confirm version is 0.1.0 or higher. Test with known safe .git directories to ensure proper path handling.📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from gitjacker binary
- Error logs showing directory traversal attempts
- Unexpected network connections from gitjacker process
Network Indicators:
- Outbound connections from gitjacker to unexpected destinations
- HTTP requests to .git directories from gitjacker
SIEM Query:
process.name:"gitjacker" AND (process.cmdline:".." OR process.cmdline:".git")