CVE-2024-2636
📋 TL;DR
CVE-2024-2636 is an unrestricted file upload vulnerability in Cegid Meta4 HR that allows attackers to upload malicious JSP files to the server via the '/config/espanol/update_password.jsp' endpoint. By manipulating the 'M4_NEW_PASSWORD' parameter, attackers can execute arbitrary code when the uploaded file is loaded. Organizations using vulnerable versions of Cegid Meta4 HR are affected.
💻 Affected Systems
- Cegid Meta4 HR
⚠️ 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
Full server compromise leading to data theft, ransomware deployment, or complete system takeover
Likely Case
Unauthorized file upload leading to web shell installation and subsequent lateral movement
If Mitigated
File upload attempts blocked or detected before execution
🎯 Exploit Status
Simple HTTP POST request manipulation required; no authentication bypass needed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in available references
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-meta4-hr-cegid
Restart Required: Yes
Instructions:
1. Contact Cegid for latest security patches 2. Apply vendor-provided updates 3. Restart Meta4 HR services 4. Verify patch application
🔧 Temporary Workarounds
Block vulnerable endpoint
allRestrict access to /config/espanol/update_password.jsp via web application firewall or server configuration
# WAF rule to block path: /config/espanol/update_password.jsp
# IIS: URL Rewrite rule to deny access to this path
# Apache: <Location "/config/espanol/update_password.jsp"> Deny from all </Location>
File upload restrictions
allImplement strict file upload validation and store uploaded files outside web root
# Configure file upload restrictions in web.xml or application settings
# Set maximum file size limits
# Implement file type whitelisting
🧯 If You Can't Patch
- Implement network segmentation to isolate Meta4 HR servers from critical systems
- Deploy web application firewall with rules to detect and block malicious file upload patterns
🔍 How to Verify
Check if Vulnerable:
Test if /config/espanol/update_password.jsp accepts file uploads with modified M4_NEW_PASSWORD parameterCheck Version:
Check Meta4 HR version via administrative interface or consult vendor documentationVerify Fix Applied:
Attempt exploitation after patch application; endpoint should reject malicious uploads📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /config/espanol/update_password.jsp with unusual parameters
- File creation events in web directories with .jsp extensions
- Unusual process execution from web server context
Network Indicators:
- HTTP traffic to update_password.jsp endpoint with file upload patterns
- Outbound connections from web server to suspicious IPs
SIEM Query:
source="web_server" AND (url="/config/espanol/update_password.jsp" OR file_extension=".jsp") AND action="upload"