CVE-2024-25187
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in 71cms v1.0.0 that allows remote unauthenticated attackers to make the server send HTTP requests to internal systems. Attackers can potentially access sensitive information from internal services that should not be externally accessible. All users running 71cms v1.0.0 are affected.
💻 Affected Systems
- 71cms
📦 What is this software?
71cms by Xiaocheng Keji
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal metadata services (like AWS/Azure instance metadata), internal APIs, database admin interfaces, or other sensitive internal systems, potentially leading to full system compromise.
Likely Case
Attackers will scan for and exploit this to access internal services, steal credentials from metadata services, or perform port scanning of internal networks.
If Mitigated
With proper network segmentation and egress filtering, impact is limited to what the server can reach internally.
🎯 Exploit Status
The GitHub issue shows exploitation details. SSRF vulnerabilities are commonly weaponized due to their utility in internal network reconnaissance and data exfiltration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: unknown
Vendor Advisory: https://github.com/xiaocheng-keji/71cms/issues/2
Restart Required: No
Instructions:
No official patch available. Check the GitHub repository for updates or consider migrating to a different CMS.
🔧 Temporary Workarounds
Block getweather.html endpoint
allUse web server configuration to block access to the vulnerable endpoint
# For Apache: RewriteRule ^getweather\.html$ - [F]
# For Nginx: location = /getweather.html { return 403; }
Implement input validation
allAdd validation to reject URLs pointing to internal IP ranges
# Implement in application code to validate URLs against internal IP ranges
🧯 If You Can't Patch
- Implement strict network egress filtering to limit what the server can connect to internally
- Deploy a Web Application Firewall (WAF) with SSRF protection rules
🔍 How to Verify
Check if Vulnerable:
Attempt to access /getweather.html with a URL parameter pointing to an internal service (like http://169.254.169.254/latest/meta-data/) and check if the server responds with internal data.Check Version:
Check the CMS version in the admin panel or configuration filesVerify Fix Applied:
After applying workarounds, test the same SSRF payloads to confirm they no longer work.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to getweather.html with URL parameters
- Outbound connections from the web server to internal IP addresses following getweather.html requests
Network Indicators:
- Web server making unexpected outbound HTTP requests to internal IP ranges
SIEM Query:
source="web_server_logs" AND uri="/getweather.html" AND query_string="*url=*"