CVE-2024-8929
📋 TL;DR
A memory disclosure vulnerability in PHP's MySQL client allows a malicious MySQL server to read heap memory from the client. This could expose sensitive data from previous SQL queries or other users' data. Affects PHP applications connecting to untrusted MySQL servers.
💻 Affected Systems
- PHP
📦 What is this software?
Php by Php
Php by Php
Php by Php
⚠️ Risk & Real-World Impact
Worst Case
Malicious MySQL server extracts sensitive application data, session tokens, or credentials from PHP heap memory, leading to full system compromise.
Likely Case
Information disclosure of SQL query data or application memory contents when connecting to compromised or untrusted MySQL servers.
If Mitigated
Limited impact if only connecting to trusted MySQL servers with proper network segmentation.
🎯 Exploit Status
Requires control of MySQL server to exploit; client must connect to malicious server. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: PHP 8.1.31, 8.2.26, 8.3.14
Vendor Advisory: https://github.com/php/php-src/security/advisories/GHSA-h35g-vwh6-m678
Restart Required: Yes
Instructions:
1. Update PHP to patched version using package manager (apt, yum, etc.). 2. Restart web server (Apache, Nginx, PHP-FPM). 3. Verify PHP version with php -v.
🔧 Temporary Workarounds
Restrict MySQL Connections
allOnly allow PHP applications to connect to trusted, internal MySQL servers.
Network Segmentation
linuxImplement firewall rules to restrict outbound MySQL connections from PHP servers.
iptables -A OUTPUT -p tcp --dport 3306 -j DROP
🧯 If You Can't Patch
- Isolate PHP servers from untrusted networks and external MySQL servers.
- Implement application-level encryption for sensitive data transmitted to MySQL.
🔍 How to Verify
Check if Vulnerable:
Run php -v and check if version is in affected range: 8.1.0-8.1.30, 8.2.0-8.2.25, 8.3.0-8.3.13.Check Version:
php -v | head -1Verify Fix Applied:
Confirm php -v shows 8.1.31+, 8.2.26+, or 8.3.14+.📡 Detection & Monitoring
Log Indicators:
- Unusual MySQL connection attempts from PHP to external IPs
- Errors in PHP logs related to MySQL memory allocation
Network Indicators:
- PHP servers making MySQL connections to untrusted external IPs
SIEM Query:
source="php.log" AND "mysql_connect" AND dest_ip NOT IN (trusted_mysql_ips)