CVE-2025-61464
📋 TL;DR
This vulnerability allows attackers to perform second-order SQL injection attacks in gnuboard4 through the search_table parameter in bbs/search.php. Attackers can inject malicious SQL queries that get stored and executed later, potentially leading to data manipulation or extraction. All users running gnuboard4 v4.36.04 and earlier versions are affected.
💻 Affected Systems
- gnuboard gnuboard4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, modification, or deletion; potential privilege escalation to administrative access.
Likely Case
Unauthorized data access and extraction from the gnuboard database, potentially exposing user information, posts, and other sensitive content.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing successful injection.
🎯 Exploit Status
Second-order SQL injection requires understanding of application flow and persistence mechanisms; exploitation requires multiple steps to store then trigger malicious payload.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after v4.36.04 (check latest release)
Vendor Advisory: https://github.com/gnuboard/gnuboard4/issues/1
Restart Required: No
Instructions:
1. Backup your gnuboard installation and database. 2. Download the latest gnuboard4 version from the official repository. 3. Replace affected files, particularly bbs/search.php. 4. Verify the fix by testing search functionality with SQL injection test payloads.
🔧 Temporary Workarounds
Input Validation Filter
allAdd strict input validation to sanitize search_table parameter before processing
Modify bbs/search.php to include: $search_table = preg_replace('/[^a-zA-Z0-9_]/', '', $_GET['search_table']);
Disable Search Functionality
allTemporarily disable the vulnerable search feature until patching
Comment out or remove search functionality in bbs/search.php or restrict access via .htaccess
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block SQL injection patterns in search parameters
- Restrict database user permissions to read-only for the application database user
🔍 How to Verify
Check if Vulnerable:
Test search functionality with SQL injection payloads like: search_table=users' OR '1'='1Check Version:
Check version in common.php or config files; typically located in /config or root directoryVerify Fix Applied:
After patching, test with same SQL injection payloads and verify they are properly sanitized or rejected📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed search attempts with special characters
- Search parameters containing SQL keywords (SELECT, UNION, etc.)
Network Indicators:
- HTTP requests to search.php with suspicious parameters
- Abnormal search patterns from single IP addresses
SIEM Query:
web.url:*search.php* AND (web.param:*SELECT* OR web.param:*UNION* OR web.param:*OR '1'='1*)