CVE-2025-1113
📋 TL;DR
This critical vulnerability in tarzan-cms allows remote attackers to execute arbitrary code through insecure deserialization in the theme upload function. Attackers can exploit this to take control of affected systems. All users of tarzan-cms up to version 1.0.0 are affected.
💻 Affected Systems
- tarzan-cms
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Unauthorized file upload leading to web shell installation and subsequent server compromise.
If Mitigated
Attack blocked at network perimeter or detected by security controls before exploitation.
🎯 Exploit Status
Exploit requires admin access to the theme upload function; public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://gitee.com/taisan/tarzan-cms/issues/IBHZ0J
Restart Required: No
Instructions:
No official patch available. Consider migrating to alternative CMS or implementing strict workarounds.
🔧 Temporary Workarounds
Disable Theme Upload
allRemove or restrict access to the vulnerable theme upload endpoint
# Remove or rename the themes upload directory
# Example: mv /path/to/tarzan-cms/admin/themes /path/to/tarzan-cms/admin/themes.disabled
Web Application Firewall Rules
allBlock requests to the vulnerable endpoint using WAF
# Example ModSecurity rule: SecRule REQUEST_URI "@contains /admin#themes" "id:1001,phase:1,deny"
🧯 If You Can't Patch
- Isolate affected systems from internet access and restrict to internal network only
- Implement strict network segmentation and monitor all traffic to/from affected systems
🔍 How to Verify
Check if Vulnerable:
Check if tarzan-cms version is 1.0.0 or earlier and if /admin#themes endpoint is accessibleCheck Version:
# Check tarzan-cms version in configuration files or admin panelVerify Fix Applied:
Verify theme upload functionality is disabled or patched version is installed📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /admin#themes endpoint
- Deserialization errors in application logs
- Unexpected process execution from web server
Network Indicators:
- POST requests to /admin#themes with serialized data
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND uri="/admin#themes" AND method="POST" AND size>100000