CVE-2025-22137
📋 TL;DR
CVE-2025-22137 is a critical file overwrite vulnerability in Pingvin Share that allows attackers to overwrite arbitrary files on the server via HTTP POST requests. Both authenticated users and unauthenticated users (if anonymous shares are enabled) can exploit this vulnerability. This affects all Pingvin Share instances running vulnerable versions.
💻 Affected Systems
- Pingvin Share
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through overwriting critical system files, installation of backdoors, or denial of service by corrupting essential files.
Likely Case
Data loss, service disruption, or unauthorized access to sensitive information stored on the server.
If Mitigated
Limited impact if proper file permissions and network segmentation are in place, though file integrity could still be compromised.
🎯 Exploit Status
Exploitation requires only HTTP POST requests with crafted parameters. No special tools or advanced knowledge needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.4.0
Vendor Advisory: https://github.com/stonith404/pingvin-share/security/advisories/GHSA-rjwx-p44f-mcrv
Restart Required: Yes
Instructions:
1. Backup your current installation and data. 2. Stop the Pingvin Share service. 3. Update to version 1.4.0 using your deployment method (Docker, package manager, or manual update). 4. Restart the service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Disable Anonymous Shares
allPrevents unauthenticated exploitation by requiring authentication for all file sharing operations.
Edit configuration to set ALLOW_ANONYMOUS_SHARES=false
Restrict File System Permissions
linuxLimit the application's ability to write to sensitive directories.
chmod -R 755 /var/www/pingvin-share
chown -R www-data:www-data /var/www/pingvin-share
🧯 If You Can't Patch
- Disable anonymous shares in configuration immediately
- Implement strict network access controls to limit who can access the Pingvin Share instance
🔍 How to Verify
Check if Vulnerable:
Check if Pingvin Share version is below 1.4.0 by examining the web interface footer or checking the package version.Check Version:
docker exec pingvin-share cat /app/package.json | grep versionVerify Fix Applied:
Confirm version is 1.4.0 or higher and test that file overwrite attempts via POST requests are properly rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to file upload endpoints
- Failed file write attempts outside expected directories
- Multiple 403 or 500 errors from file operations
Network Indicators:
- HTTP POST requests with crafted file paths in parameters
- Unusual traffic patterns to file upload endpoints
SIEM Query:
source="pingvin-share" AND (method="POST" AND uri="/api/files" AND (status=403 OR status=500))