CVE-2021-47915
📋 TL;DR
PHP Melody 3.0 contains a remote SQL injection vulnerability in the video edit module that allows authenticated attackers to execute arbitrary SQL commands. Attackers can exploit the unvalidated 'vid' parameter to compromise the database and potentially the entire web application. This affects all PHP Melody 3.0 installations with the video edit module enabled.
💻 Affected Systems
- PHP Melody
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, privilege escalation, and potential remote code execution via database functions.
Likely Case
Data exfiltration, user account compromise, and potential website defacement through database manipulation.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing successful exploitation.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated. Public proof-of-concept code exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 3.0.1 or later
Vendor Advisory: https://www.phpsugar.com/phpmelody.html
Restart Required: No
Instructions:
1. Download PHP Melody 3.0.1 or later from official sources. 2. Backup current installation. 3. Replace vulnerable files with patched version. 4. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize the 'vid' parameter before processing
Add parameter validation in video edit module: if(!is_numeric($_GET['vid'])) { die('Invalid parameter'); }
WAF Rule
allImplement web application firewall rules to block SQL injection attempts
Add WAF rule: Detect and block SQL keywords in 'vid' parameter
🧯 If You Can't Patch
- Disable video edit module functionality completely
- Implement strict network segmentation and limit database access from web server
🔍 How to Verify
Check if Vulnerable:
Check if PHP Melody version is 3.0 and video edit module is accessibleCheck Version:
Check PHP Melody configuration files or admin panel for version informationVerify Fix Applied:
Verify version is 3.0.1 or later and test 'vid' parameter with SQL injection payloads📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by video edit access
- SQL syntax errors in web server logs
Network Indicators:
- Unusual database connections from web server
- SQL injection patterns in HTTP requests
SIEM Query:
source="web_logs" AND (vid="*' OR*" OR vid="*UNION*" OR vid="*SELECT*" OR vid="*INSERT*")