CVE-2024-7742
📋 TL;DR
This critical vulnerability in wanglongcn ltcms 1.0.20 allows remote attackers to perform server-side request forgery (SSRF) through the /api/file/multiDownload endpoint. Attackers can manipulate the 'file' parameter to make the server send requests to internal systems, potentially accessing sensitive data or services. Organizations using ltcms 1.0.20 are affected.
💻 Affected Systems
- wanglongcn ltcms
📦 What is this software?
Ltcms by Ltcms
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or pivot to other systems within the network, potentially leading to full network compromise.
Likely Case
Attackers will use SSRF to scan internal networks, access metadata services, or interact with internal APIs to steal credentials and sensitive information.
If Mitigated
With proper network segmentation and egress filtering, impact is limited to the compromised server only.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute. The vendor did not respond to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch is available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Disable vulnerable endpoint
allBlock access to the /api/file/multiDownload endpoint via web server configuration or application firewall.
# For Apache: RewriteRule ^/api/file/multiDownload - [F]
# For Nginx: location ~ ^/api/file/multiDownload { deny all; }
Input validation filter
allImplement strict input validation to reject URLs pointing to internal IP ranges or localhost.
# Example PHP validation: if(preg_match('/^(127\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.|192\.168\.)/', $file)) { die('Invalid file'); }
🧯 If You Can't Patch
- Implement network segmentation to restrict the server's ability to reach internal services
- Deploy a web application firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Test if the /api/file/multiDownload endpoint accepts URLs pointing to internal services or localhost. Use curl: curl -X POST 'http://target/api/file/multiDownload' -d 'file=http://169.254.169.254/latest/meta-data/'Check Version:
Check the ltcms version in the application's admin panel or configuration files.Verify Fix Applied:
After implementing workarounds, repeat the test and verify that internal URL requests are blocked or rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /api/file/multiDownload with URL parameters
- Outbound requests from the server to internal IP addresses following API calls
Network Indicators:
- Server making HTTP requests to internal IP ranges (10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x) or localhost
SIEM Query:
source="web_server_logs" AND uri="/api/file/multiDownload" AND method="POST" AND (param="file" CONTAINS "http://" OR param="file" CONTAINS "https://")