CVE-2021-34081
📋 TL;DR
This CVE describes an OS command injection vulnerability in the gitsome npm package that allows attackers to execute arbitrary commands on the system by crafting malicious tag names in git repositories. Attackers can achieve remote code execution with the privileges of the gitsome process. Users of gitsome versions 0.2.3 and earlier are affected.
💻 Affected Systems
- gitsome
📦 What is this software?
Gitsome by Gitsome Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining shell access and executing arbitrary commands with the privileges of the gitsome process, potentially leading to data theft, lateral movement, or complete system takeover.
Likely Case
Remote code execution allowing attackers to run commands on the affected system, potentially installing malware, exfiltrating data, or using the system as a foothold for further attacks.
If Mitigated
Limited impact if gitsome runs with minimal privileges in isolated environments, though command execution would still be possible within those constraints.
🎯 Exploit Status
Exploitation requires the attacker to control or influence tag names in git repositories processed by gitsome. The vulnerability is in how gitsome handles tag names when executing git commands.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.4 or later
Vendor Advisory: https://www.npmjs.com/package/gitsome
Restart Required: No
Instructions:
1. Update gitsome to version 0.2.4 or later using npm update gitsome. 2. Verify the update with npm list gitsome. 3. Restart any applications or services using gitsome.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation for tag names before passing them to gitsome functions.
Run with minimal privileges
allRun gitsome processes with the least privileges necessary, using non-root users and restricted permissions.
🧯 If You Can't Patch
- Discontinue use of gitsome and replace with alternative git tools that are not vulnerable.
- Implement network segmentation to isolate systems using gitsome and restrict access to them.
🔍 How to Verify
Check if Vulnerable:
Check gitsome version with npm list gitsome. If version is 0.2.3 or earlier, the system is vulnerable.Check Version:
npm list gitsomeVerify Fix Applied:
After updating, verify with npm list gitsome that version is 0.2.4 or later.📡 Detection & Monitoring
Log Indicators:
- Unusual command executions from gitsome processes
- Suspicious git operations with crafted tag names
- Error logs showing command injection attempts
Network Indicators:
- Unexpected outbound connections from systems running gitsome
- Traffic patterns indicating data exfiltration
SIEM Query:
process.name:gitsome AND (cmdline:*;* OR cmdline:*&* OR cmdline:*|* OR cmdline:*`*)