CVE-2025-6762
📋 TL;DR
This critical vulnerability in diyhi bbs allows remote attackers to perform server-side request forgery (SSRF) by manipulating the Host header in the admin login component. Attackers can force the server to make unauthorized requests to internal or external systems. All users running diyhi bbs versions up to 6.8 are affected.
💻 Affected Systems
- diyhi bbs
📦 What is this software?
Bbs by Diyhi
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of internal network services, data exfiltration, or lateral movement to other systems through the vulnerable server.
Likely Case
Unauthorized access to internal services, information disclosure from internal endpoints, or potential credential theft.
If Mitigated
Limited impact if proper network segmentation and input validation are in place, though SSRF risks remain.
🎯 Exploit Status
Public proof-of-concept available on GitHub, exploitation requires only HTTP request manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to version 6.9+ if released, or apply workarounds.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allBlock or sanitize malicious Host header values at the WAF or reverse proxy level.
# Example nginx config: if ($http_host !~ "^yourdomain\.com$") { return 444; }
Input Validation
allImplement strict validation of Host header values in the application code.
# Validate Host header matches allowed domains only
🧯 If You Can't Patch
- Implement network segmentation to restrict the vulnerable server's outbound connections.
- Deploy a reverse proxy with strict Host header validation before requests reach the application.
🔍 How to Verify
Check if Vulnerable:
Test by sending a crafted HTTP request to /admin/login with a malicious Host header and observing server behavior.Check Version:
Check diyhi bbs version in admin panel or configuration files.Verify Fix Applied:
Verify that malicious Host headers are rejected or sanitized, and the server no longer makes unauthorized requests.📡 Detection & Monitoring
Log Indicators:
- Unusual Host header values in access logs
- Outbound requests from server to unexpected internal/external IPs
Network Indicators:
- HTTP requests with manipulated Host headers
- Server making requests to internal services not normally accessed
SIEM Query:
source="web_logs" AND (http_host!="expected_domain" OR http_host CONTAINS "internal_ip")🔗 References
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-02.md
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-02.md#steps-to-reproduce
- https://vuldb.com/?ctiid.314073
- https://vuldb.com/?id.314073
- https://vuldb.com/?submit.598896
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-02.md
