CVE-2024-27565
📋 TL;DR
This Server-Side Request Forgery (SSRF) vulnerability in the ChatGPT-wechat-personal project allows attackers to force the application to make arbitrary HTTP requests to internal or external systems. It affects deployments using the vulnerable weixin.php component, potentially exposing internal services or enabling further attacks.
💻 Affected Systems
- ChatGPT-wechat-personal
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, perform port scanning of internal networks, or chain with other vulnerabilities to achieve remote code execution.
Likely Case
Unauthorized access to internal HTTP services, metadata services (like AWS/Azure instance metadata), or internal APIs that shouldn't be publicly accessible.
If Mitigated
Limited to accessing only whitelisted external services with proper input validation and network segmentation in place.
🎯 Exploit Status
SSRF vulnerabilities are commonly exploited and weaponization is straightforward given the public PoC
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://github.com/dirk1983/chatgpt-wechat-personal/issues/4
Restart Required: No
Instructions:
1. Review the GitHub issue for community patches
2. Implement proper input validation in weixin.php
3. Restrict URL schemes and destinations
4. Update to a patched version if available
🔧 Temporary Workarounds
Input Validation and Whitelisting
allImplement strict validation of user-supplied URLs, allowing only specific domains or patterns
Modify weixin.php to validate URLs against a whitelist before processing
Network Segmentation
linuxRestrict outbound network access from the vulnerable server
iptables -A OUTPUT -p tcp --dport 80 -j DROP
iptables -A OUTPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Implement WAF rules to block SSRF patterns in requests to weixin.php
- Isolate the vulnerable server in a restricted network segment with no access to internal services
🔍 How to Verify
Check if Vulnerable:
Test if weixin.php accepts arbitrary URLs by sending a request with a URL parameter pointing to a controlled serverCheck Version:
git log --oneline | grep a0857f6Verify Fix Applied:
Attempt the same SSRF test and verify the request is blocked or properly validated📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from the server
- Requests to internal IP addresses or metadata services
Network Indicators:
- HTTP traffic from server to unexpected internal/external destinations
- Port scanning patterns from the server
SIEM Query:
source="weixin.php" AND (url CONTAINS "169.254.169.254" OR url CONTAINS "metadata.google.internal" OR url CONTAINS "localhost")