CVE-2023-4005
📋 TL;DR
CVE-2023-4005 is an insufficient session expiration vulnerability in fossbilling that allows attackers to maintain access to user sessions beyond intended logout times. This affects all fossbilling installations prior to version 0.5.5. Attackers could potentially hijack authenticated sessions to perform unauthorized actions.
💻 Affected Systems
- fossbilling
📦 What is this software?
Fossbilling by Fossbilling
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain persistent administrative access, allowing them to modify billing data, access sensitive customer information, or disrupt billing operations.
Likely Case
Session hijacking leading to unauthorized access to user accounts and potential data exposure.
If Mitigated
Limited impact with proper session management controls and monitoring in place.
🎯 Exploit Status
Exploitation requires session access but is straightforward once obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.5.5
Vendor Advisory: https://github.com/fossbilling/fossbilling/commit/20c23b051eb690cb4ae60a257f6bb46eb3aae2d1
Restart Required: Yes
Instructions:
1. Backup your current installation. 2. Update to fossbilling version 0.5.5 or later. 3. Restart the web server/service. 4. Verify session expiration is working correctly.
🔧 Temporary Workarounds
Manual Session Cleanup
allImplement custom session cleanup scripts to forcibly expire old sessions
# Custom implementation required based on your environment
Session Timeout Reduction
allReduce session timeout values in application configuration
# Modify session configuration in your fossbilling installation
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block suspicious session activity
- Enable detailed session logging and monitor for abnormal session durations
🔍 How to Verify
Check if Vulnerable:
Check your fossbilling version. If it's below 0.5.5, you are vulnerable.Check Version:
Check the version in your fossbilling admin panel or configuration filesVerify Fix Applied:
After updating to 0.5.5+, test that sessions properly expire after logout and timeout periods.📡 Detection & Monitoring
Log Indicators:
- Unusually long session durations
- Multiple sessions from same user overlapping
- Failed logout attempts
Network Indicators:
- Repeated session token reuse
- Session cookies with extended lifetimes
SIEM Query:
source="fossbilling" AND (session_duration>3600 OR logout_failure)🔗 References
- https://github.com/fossbilling/fossbilling/commit/20c23b051eb690cb4ae60a257f6bb46eb3aae2d1
- https://huntr.dev/bounties/f0aacce1-79bc-4765-95f1-7e824433b9e4
- https://github.com/fossbilling/fossbilling/commit/20c23b051eb690cb4ae60a257f6bb46eb3aae2d1
- https://huntr.dev/bounties/f0aacce1-79bc-4765-95f1-7e824433b9e4
