CVE-2025-25768
📋 TL;DR
MRCMS v3.1.2 contains a server-side template injection vulnerability in DispatcherServlet.java that allows attackers to execute arbitrary code on the server. This affects all systems running the vulnerable version of MRCMS. Attackers can potentially take full control of affected servers.
💻 Affected Systems
- MRCMS
📦 What is this software?
Mrcms by Mrcms
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, or use as a foothold for lateral movement within the network.
Likely Case
Remote code execution allowing attackers to install backdoors, modify content, or steal sensitive data from the CMS database.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and least-privilege principles are implemented.
🎯 Exploit Status
SSTI vulnerabilities typically require some knowledge of the template engine, but exploitation is straightforward once the payload is crafted.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Monitor official MRCMS channels for security updates. 2. If no patch is available, consider upgrading to a newer version if compatible. 3. Apply workarounds immediately.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and sanitization for all user inputs to the DispatcherServlet component.
# Add input validation in DispatcherServlet.java
# Example: Validate and sanitize all template parameters
# Use whitelisting for allowed template expressions
WAF Rule Implementation
allDeploy Web Application Firewall rules to block SSTI payload patterns.
# Example ModSecurity rule:
SecRule ARGS "\$\{.*\}" "id:1001,phase:2,deny,msg:'SSTI attempt detected'"
🧯 If You Can't Patch
- Isolate the MRCMS instance in a segmented network with strict egress filtering.
- Implement application-level monitoring and alerting for suspicious template execution patterns.
🔍 How to Verify
Check if Vulnerable:
Check if MRCMS version is 3.1.2 and review DispatcherServlet.java for template injection vulnerabilities.Check Version:
Check MRCMS configuration files or admin panel for version information.Verify Fix Applied:
Test with safe SSTI payloads to ensure they are properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual template execution patterns
- Suspicious payloads containing ${, #{, or <% in requests
- Unexpected Java class loading in logs
Network Indicators:
- HTTP requests with template injection payloads to /servlet/DispatcherServlet
- Unusual outbound connections from MRCMS server
SIEM Query:
source="mrcms.logs" AND ("${*" OR "#{" OR "<%" OR "DispatcherServlet")