CVE-2023-26045
📋 TL;DR
This vulnerability in NodeBB forum software allows attackers to execute arbitrary JavaScript files on the server through a path traversal attack combined with object destructuring assignment. It affects NodeBB versions 2.5.0 through 2.8.6. Attackers can achieve remote code execution on vulnerable systems.
💻 Affected Systems
- NodeBB
📦 What is this software?
Nodebb by Nodebb
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing arbitrary code execution, data theft, and lateral movement within the network.
Likely Case
Remote code execution leading to data exfiltration, installation of backdoors, or cryptocurrency mining malware.
If Mitigated
Limited impact with proper network segmentation and minimal privileges, but still potential for data exposure.
🎯 Exploit Status
Exploitation requires authenticated access but the vulnerability is easily weaponized once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.8.7
Vendor Advisory: https://github.com/NodeBB/NodeBB/security/advisories/GHSA-vh2g-6c4x-5hmp
Restart Required: Yes
Instructions:
1. Backup your NodeBB installation and database. 2. Update NodeBB to version 2.8.7 or later using npm update. 3. Restart the NodeBB service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Manual patch cherry-pick
allApply the specific fix from commit ec58700f6dff8e5b4af1544f6205ec362b593092 to your codebase
git cherry-pick ec58700f6dff8e5b4af1544f6205ec362b593092
🧯 If You Can't Patch
- Restrict user export functionality to administrators only
- Implement strict input validation and sanitization for file path parameters
🔍 How to Verify
Check if Vulnerable:
Check NodeBB version: if between 2.5.0 and 2.8.6 inclusive, system is vulnerable.Check Version:
npm list nodebb | grep nodebbVerify Fix Applied:
Verify NodeBB version is 2.8.7 or higher and test user export functionality with malicious payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns in NodeBB logs
- Multiple failed user export attempts
- Suspicious JavaScript file execution attempts
Network Indicators:
- Unusual outbound connections from NodeBB server
- Traffic patterns indicating data exfiltration
SIEM Query:
source="nodebb.log" AND ("user.export" OR "path traversal" OR "../")🔗 References
- https://github.com/NodeBB/NodeBB/commit/ec58700f6dff8e5b4af1544f6205ec362b593092
- https://github.com/NodeBB/NodeBB/security/advisories/GHSA-vh2g-6c4x-5hmp
- https://security.netapp.com/advisory/ntap-20230831-0004/
- https://github.com/NodeBB/NodeBB/commit/ec58700f6dff8e5b4af1544f6205ec362b593092
- https://github.com/NodeBB/NodeBB/security/advisories/GHSA-vh2g-6c4x-5hmp
- https://security.netapp.com/advisory/ntap-20230831-0004/
