CVE-2025-55137
📋 TL;DR
LinkJoin versions through commit 882f196 lack proper type checking in password reset functionality, allowing attackers to bypass authentication controls. This vulnerability affects all systems running vulnerable versions of LinkJoin software. Attackers could potentially reset passwords without proper authorization.
💻 Affected Systems
- LinkJoin
⚠️ 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 account takeover through unauthorized password reset, leading to privilege escalation and data compromise.
Likely Case
Unauthorized password reset for targeted accounts, enabling access to user data and potentially lateral movement.
If Mitigated
Limited impact with proper authentication monitoring and rate limiting in place.
🎯 Exploit Status
Exploitation likely requires sending specially crafted requests to password reset endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 882f196
Vendor Advisory: https://github.com/Latkecrszy/linkjoin/pull/4
Restart Required: Yes
Instructions:
1. Update LinkJoin to version after commit 882f196
2. Restart the LinkJoin service
3. Verify the fix by testing password reset functionality
🔧 Temporary Workarounds
Disable password reset functionality
allTemporarily disable password reset endpoints until patching is complete
# Configuration dependent - modify application settings to disable password reset
Implement rate limiting
allAdd rate limiting to password reset endpoints to reduce attack surface
# Implementation varies by deployment - use web server or application-level rate limiting
🧯 If You Can't Patch
- Implement network segmentation to isolate LinkJoin from critical systems
- Enable detailed logging and monitoring of all password reset attempts
🔍 How to Verify
Check if Vulnerable:
Check LinkJoin version/commit hash; if at or before 882f196, system is vulnerableCheck Version:
# Check commit hash: git log --oneline -1Verify Fix Applied:
Test password reset functionality with invalid input types to ensure proper validation📡 Detection & Monitoring
Log Indicators:
- Multiple failed password reset attempts
- Password reset requests with unusual parameters
- Successful password resets from unexpected IPs
Network Indicators:
- Unusual traffic patterns to password reset endpoints
- Requests bypassing normal authentication flows
SIEM Query:
source="linkjoin" AND (event="password_reset" OR endpoint="/reset") AND status="success"