CVE-2024-38457
📋 TL;DR
This CVE describes a Cross-Site Request Forgery (CSRF) vulnerability in XenForo forum software versions before 2.2.16. Attackers can trick authenticated users into performing unintended actions on the forum without their knowledge. All XenForo installations running vulnerable versions are affected.
💻 Affected Systems
- XenForo
📦 What is this software?
Xenforo by Xenforo
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform administrative actions like creating new admin accounts, modifying forum settings, deleting content, or stealing sensitive data by tricking administrators into clicking malicious links.
Likely Case
Attackers trick regular users into changing their profile settings, posting malicious content, or performing other actions within their permission level.
If Mitigated
With proper CSRF protections and user awareness, impact is limited to actions within the victim's permission scope, but still represents a significant security risk.
🎯 Exploit Status
CSRF attacks typically require user interaction (clicking a malicious link) and the victim must be authenticated to the XenForo instance.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.16 or later
Restart Required: No
Instructions:
1. Backup your XenForo installation and database. 2. Download XenForo 2.2.16 or later from the customer area. 3. Upload the new files to your server, overwriting existing files. 4. Run the upgrade script via your browser. 5. Clear the system cache from the admin control panel.
🔧 Temporary Workarounds
Implement CSRF Tokens Manually
allAdd CSRF tokens to forms and validate them on submission
SameSite Cookie Attribute
allSet SameSite=Strict or Lax on session cookies to limit CSRF attacks
Set-Cookie: session=value; SameSite=Strict; Secure; HttpOnly
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block CSRF attempts
- Educate users about the risks of clicking unknown links while logged into the forum
🔍 How to Verify
Check if Vulnerable:
Check your XenForo version in the admin control panel under Tools > System Health > Version InformationCheck Version:
Check via admin panel or examine includes/config.php for version informationVerify Fix Applied:
Verify version is 2.2.16 or later and test form submissions with missing/invalid CSRF tokens are rejected📡 Detection & Monitoring
Log Indicators:
- Multiple failed form submissions from same IP
- Unusual administrative actions from non-admin IPs
- Requests missing expected CSRF tokens
Network Indicators:
- HTTP POST requests to XenForo endpoints without Referer headers or CSRF tokens
- Requests from unexpected origins to administrative endpoints
SIEM Query:
source="xenforo_logs" AND (action="admin_action" OR status="403") AND csrf_token="missing"🔗 References
- http://seclists.org/fulldisclosure/2024/Jul/11
- https://xenforo.com/community/threads/xenforo-2-1-15-patch-1-2-2-16-patch-2-and-xenforo-media-gallery-2-1-9-2-2-6-released-includes-security-fixes.222133/
- http://seclists.org/fulldisclosure/2024/Jul/11
- https://xenforo.com/community/threads/xenforo-2-1-15-patch-1-2-2-16-patch-2-and-xenforo-media-gallery-2-1-9-2-2-6-released-includes-security-fixes.222133/
