CVE-2024-11311
📋 TL;DR
CVE-2024-11311 is a critical path traversal vulnerability in TRCore's DVC that allows unauthenticated remote attackers to upload arbitrary files to any directory. This can lead to remote code execution through webshell uploads. Organizations using vulnerable versions of TRCore DVC are affected.
💻 Affected Systems
- TRCore DVC
📦 What is this software?
Dvc by Trcore
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, data exfiltration, ransomware deployment, and lateral movement to other systems.
Likely Case
Attackers upload webshells to gain persistent access, execute arbitrary commands, and potentially pivot to internal networks.
If Mitigated
Limited impact with proper network segmentation and file upload restrictions preventing successful exploitation.
🎯 Exploit Status
The vulnerability requires no authentication and has straightforward exploitation via crafted file upload requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references, but vendor has released fixes
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-8247-83457-2.html
Restart Required: Yes
Instructions:
1. Contact TRCore for the latest patched version. 2. Backup configuration and data. 3. Apply the vendor-provided patch. 4. Restart the DVC service. 5. Verify the fix is applied.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict network access to DVC interface to trusted IPs only
iptables -A INPUT -p tcp --dport [DVC_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [DVC_PORT] -j DROP
Web Application Firewall Rules
allImplement WAF rules to block path traversal patterns and suspicious file uploads
🧯 If You Can't Patch
- Implement strict network segmentation to isolate DVC systems from critical assets
- Deploy file integrity monitoring to detect unauthorized file uploads and modifications
🔍 How to Verify
Check if Vulnerable:
Test if unauthenticated file upload with path traversal is possible by attempting to upload a file to a directory outside the intended upload locationCheck Version:
Check DVC version through admin interface or configuration files (specific command depends on installation)Verify Fix Applied:
Attempt the same path traversal file upload test after patching - it should be blocked or restricted📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns
- Requests containing '../' sequences
- Uploads of executable file types to unexpected directories
Network Indicators:
- Unusual outbound connections from DVC server
- HTTP POST requests with file uploads to DVC endpoint from untrusted sources
SIEM Query:
source="dvc_logs" AND (http_method="POST" AND uri="*/upload*" AND (user_agent="*" OR referer="*")) AND (message="*../*" OR message="*.php" OR message="*.jsp" OR message="*.asp")