CVE-2025-50103
📋 TL;DR
A vulnerability in MySQL Server's LDAP authentication component allows high-privileged attackers with network access to cause denial of service by crashing or hanging the server. This affects MySQL Server versions 9.0.0 through 9.3.0. The attack is difficult to exploit and requires administrative privileges.
💻 Affected Systems
- Oracle MySQL Server
📦 What is this software?
Mysql by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service where MySQL Server becomes unresponsive, requiring manual restart and causing service disruption.
Likely Case
Temporary service interruption requiring database restart, potentially affecting applications relying on MySQL.
If Mitigated
Minimal impact due to proper access controls and network segmentation limiting attack surface.
🎯 Exploit Status
Requires high privileged attacker (PR:H) and difficult to exploit (AC:H). No public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.3.1 or later (check Oracle Critical Patch Update)
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Check current MySQL version. 2. Download and apply latest patch from Oracle. 3. Restart MySQL service. 4. Verify patch installation.
🔧 Temporary Workarounds
Disable LDAP Authentication
allTemporarily disable LDAP authentication if not required
--skip-ldap-authentication in MySQL configuration
Restrict Network Access
linuxLimit network access to MySQL to trusted sources only
iptables -A INPUT -p tcp --dport 3306 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 3306 -j DROP
🧯 If You Can't Patch
- Implement strict access controls to limit high-privileged accounts
- Monitor MySQL logs for unusual authentication attempts or crash events
🔍 How to Verify
Check if Vulnerable:
Run: SELECT VERSION(); and check if version is between 9.0.0 and 9.3.0Check Version:
SELECT VERSION();Verify Fix Applied:
Run: SELECT VERSION(); and confirm version is 9.3.1 or higher📡 Detection & Monitoring
Log Indicators:
- MySQL crash logs
- Unexpected service restarts
- LDAP authentication failures
Network Indicators:
- Multiple authentication attempts from single source
- Unusual traffic patterns to MySQL LDAP ports
SIEM Query:
source="mysql.log" ("crash" OR "segmentation fault" OR "hang") AND version="9.*"