CVE-2024-8876
📋 TL;DR
This path traversal vulnerability in TpMeCMS allows attackers to access files outside the intended directory by manipulating the 'lang' parameter in the /index/ajax/lang endpoint. It affects all TpMeCMS installations up to version 1.3.3.1 that have this functionality exposed. Remote attackers can potentially read sensitive files on the server.
💻 Affected Systems
- xiaohe4966 TpMeCMS
📦 What is this software?
Tpmecms by Xiaohe4966
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive server files like configuration files, password files, or source code, potentially leading to further compromise of the system.
Likely Case
Attackers can read arbitrary files on the server, potentially exposing sensitive configuration data or application files.
If Mitigated
With proper file permissions and web server configuration, impact is limited to files accessible by the web server user.
🎯 Exploit Status
Exploit details have been publicly disclosed, making this easily exploitable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.3.2
Vendor Advisory: Not provided in references
Restart Required: No
Instructions:
1. Download TpMeCMS version 1.3.3.2 or later from the official source. 2. Backup your current installation and database. 3. Replace the vulnerable files with the patched version. 4. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Block vulnerable endpoint
allUse web server configuration to block access to /index/ajax/lang endpoint
# For Apache: add to .htaccess
RewriteRule ^index/ajax/lang - [F,L]
# For Nginx: add to server block
location ~ /index/ajax/lang { deny all; }
Input validation filter
allAdd input validation to sanitize the lang parameter
# PHP example for input validation
$lang = preg_replace('/[^a-zA-Z0-9_-]/', '', $_GET['lang']);
🧯 If You Can't Patch
- Implement strict file permissions to limit what the web server user can access
- Deploy a web application firewall (WAF) with path traversal protection rules
🔍 How to Verify
Check if Vulnerable:
Test if you can access files outside the web root by sending a request to /index/ajax/lang?lang=../../../etc/passwd (or similar traversal payload)Check Version:
Check the CMS version in the admin panel or look for version files in the installation directoryVerify Fix Applied:
After patching, test the same traversal payloads to confirm they no longer work and return appropriate error messages📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /index/ajax/lang with ../ sequences in parameters
- Unusual file access patterns from web server process
Network Indicators:
- HTTP requests containing path traversal sequences (../, ..\) to the vulnerable endpoint
SIEM Query:
web.url:*index/ajax/lang* AND (web.query:*../* OR web.query:*..\*)