CVE-2023-51350
📋 TL;DR
This vulnerability in ujcms v8.0.2 allows remote attackers to spoof IP addresses via the X-Forwarded-For header, potentially leading to information disclosure and arbitrary code execution. Any organization running the affected ujcms version is vulnerable to this attack.
💻 Affected Systems
- ujcms
📦 What is this software?
Ujcms by Ujcms
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Information disclosure and potential privilege escalation through header manipulation attacks.
If Mitigated
Limited impact with proper input validation and header sanitization in place.
🎯 Exploit Status
Exploitation requires crafting malicious X-Forwarded-For headers but appears straightforward based on the CVE description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest ujcms releases for security updates
Vendor Advisory: https://github.com/ujcms/ujcms/issues/7
Restart Required: Yes
Instructions:
1. Backup current installation. 2. Update ujcms to the latest patched version. 3. Restart the ujcms service. 4. Verify the fix is applied.
🔧 Temporary Workarounds
Header Sanitization
allImplement input validation and sanitization for X-Forwarded-For headers at the web server or application level.
# Configure web server (e.g., nginx) to sanitize headers
# Example: nginx configuration to validate headers
WAF Rule Implementation
allDeploy Web Application Firewall rules to block malicious X-Forwarded-For header patterns.
# WAF-specific configuration commands
🧯 If You Can't Patch
- Implement strict input validation for all HTTP headers
- Deploy network segmentation and restrict access to ujcms instances
🔍 How to Verify
Check if Vulnerable:
Check if running ujcms version 8.0.2 and test X-Forwarded-For header manipulation.Check Version:
Check ujcms version in admin panel or configuration filesVerify Fix Applied:
Verify ujcms version is updated beyond 8.0.2 and test that crafted X-Forwarded-For headers no longer cause issues.📡 Detection & Monitoring
Log Indicators:
- Unusual X-Forwarded-For header patterns
- Multiple failed authentication attempts from spoofed IPs
Network Indicators:
- Malformed HTTP headers in requests to ujcms instances
SIEM Query:
Search for requests with suspicious X-Forwarded-For header patterns to ujcms endpoints