CVE-2023-41544
📋 TL;DR
This is a Server-Side Template Injection (SSTI) vulnerability in jeecg-boot version 3.5.3 that allows remote attackers to execute arbitrary code via crafted HTTP requests to the /jmreport/loadTableData component. Attackers can achieve remote code execution (RCE) on affected systems, potentially compromising the entire server. Organizations using jeecg-boot 3.5.3 for low-code development are affected.
💻 Affected Systems
- jeecg-boot
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise with attacker gaining full control, data exfiltration, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to application compromise, data theft, and potential ransomware deployment.
If Mitigated
Limited impact with proper network segmentation, WAF protection, and minimal exposed attack surface.
🎯 Exploit Status
Public exploit code is available, making this easily weaponizable by attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.5.4 or later
Vendor Advisory: https://github.com/jeecgboot/jeecg-boot
Restart Required: Yes
Instructions:
1. Upgrade jeecg-boot to version 3.5.4 or later. 2. Restart the application server. 3. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Block vulnerable endpoint
allBlock access to /jmreport/loadTableData via web server or firewall rules
# Apache: RewriteRule ^/jmreport/loadTableData - [F]
# Nginx: location ~ ^/jmreport/loadTableData { return 403; }
# Firewall: iptables -A INPUT -p tcp --dport 80 -m string --string "/jmreport/loadTableData" --algo bm -j DROP
WAF rule implementation
allDeploy WAF rules to detect and block SSTI payloads
# ModSecurity: SecRule ARGS "\$\{.*\}" "id:1001,phase:2,deny,msg:'SSTI attempt'"
# Cloud WAF: Configure custom rule to block requests containing template injection patterns
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user inputs to the vulnerable endpoint
- Deploy network segmentation to isolate the vulnerable system and restrict access to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Test if /jmreport/loadTableData endpoint accepts template injection payloads like ${7*7} returning 49Check Version:
Check application version in web interface or examine pom.xml for jeecg-boot versionVerify Fix Applied:
Attempt the same SSTI payload after patching - should return error or sanitized output📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /jmreport/loadTableData with unusual parameters
- Java process spawning unexpected child processes
- Log entries containing template injection patterns like ${, #, @
Network Indicators:
- Unusual outbound connections from application server
- HTTP requests with encoded template syntax in parameters
SIEM Query:
source="web_logs" AND uri="/jmreport/loadTableData" AND (query="*${*" OR query="*#*" OR query="*@*")