CVE-2025-6453
📋 TL;DR
A critical path traversal vulnerability in diyhi bbs 6.8 allows remote attackers to manipulate directory paths via the dirName parameter in the API component. This could enable unauthorized file access or manipulation. All systems running the affected version are vulnerable.
💻 Affected Systems
- diyhi bbs
📦 What is this software?
Bbs by Diyhi
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers could read, modify, or delete arbitrary files on the server, potentially leading to system compromise, data theft, or complete server takeover.
Likely Case
Attackers could access sensitive configuration files, user data, or source code, leading to information disclosure and potential further exploitation.
If Mitigated
With proper input validation and access controls, impact would be limited to directory traversal attempts being blocked with appropriate error logging.
🎯 Exploit Status
Public proof-of-concept demonstrates remote exploitation without authentication. The simple nature makes weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates or consider alternative software.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to reject directory traversal sequences in dirName parameter
Implement server-side validation to block strings containing '../', '..\\', or similar traversal patterns
Web Application Firewall Rules
allDeploy WAF rules to block path traversal attempts
Configure WAF to block requests containing path traversal patterns in parameters
🧯 If You Can't Patch
- Isolate the affected system behind a reverse proxy with strict input filtering
- Implement network segmentation to limit potential lateral movement if compromised
🔍 How to Verify
Check if Vulnerable:
Test the API endpoint with path traversal payloads in dirName parameter and check if unauthorized file access occursCheck Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Retest with traversal payloads after implementing fixes to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../', '..\\', or similar patterns in dirName parameter
- Unusual file access patterns from web application user
Network Indicators:
- HTTP requests with encoded traversal sequences in parameters
- Unusual outbound file transfers from web server
SIEM Query:
web.url:*dirName=*..%2f* OR web.url:*dirName=*..%5c*🔗 References
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-01.md
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-01.md#steps-to-reproduce
- https://vuldb.com/?ctiid.313560
- https://vuldb.com/?id.313560
- https://vuldb.com/?submit.598862
- https://github.com/ShenxiuSec/cve-proofs/blob/main/POC-20250618-01.md
