CVE-2024-21207
📋 TL;DR
This vulnerability in MySQL Server's InnoDB component allows high-privileged attackers with network access to cause a denial of service by crashing or hanging the server. It affects MySQL versions 8.0.38 and prior, 8.4.1 and prior, and 9.0.1 and prior. Attackers need administrative database privileges but can exploit it remotely via multiple protocols.
💻 Affected Systems
- Oracle MySQL Server
📦 What is this software?
Mysql by Oracle
Mysql by Oracle
Mysql by Oracle
Mysql by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Complete MySQL Server outage causing application downtime and service disruption until server restart.
Likely Case
Targeted DoS attacks against vulnerable MySQL instances by malicious insiders or compromised admin accounts.
If Mitigated
Limited impact due to proper access controls and network segmentation preventing unauthorized admin access.
🎯 Exploit Status
Oracle describes it as 'easily exploitable' but requires high database privileges (PR:H). No public exploit details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.0.39, 8.4.2, 9.0.2 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpuoct2024.html
Restart Required: Yes
Instructions:
1. Download latest MySQL version from Oracle website. 2. Backup databases. 3. Stop MySQL service. 4. Install updated version. 5. Start MySQL service. 6. Verify version with 'SELECT VERSION();'
🔧 Temporary Workarounds
Restrict Admin Network Access
allLimit network access to MySQL admin accounts to trusted IPs only
mysql> REVOKE ALL PRIVILEGES ON *.* FROM 'admin_user'@'%';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'admin_user'@'trusted_ip' IDENTIFIED BY 'password';
Implement Connection Rate Limiting
allLimit connection attempts to prevent rapid exploitation attempts
# In my.cnf: max_connections = 100
# In my.cnf: max_user_connections = 10
🧯 If You Can't Patch
- Implement strict access controls for MySQL admin accounts and monitor for unusual activity.
- Segment MySQL servers from untrusted networks and implement network-based DoS protection.
🔍 How to Verify
Check if Vulnerable:
Run 'SELECT VERSION();' in MySQL and compare against affected versions: 8.0.0-8.0.38, 8.4.0-8.4.1, 9.0.0-9.0.1Check Version:
mysql -u root -p -e 'SELECT VERSION();'Verify Fix Applied:
Confirm version is 8.0.39+, 8.4.2+, or 9.0.2+ using 'SELECT VERSION();'📡 Detection & Monitoring
Log Indicators:
- Unexpected MySQL crashes or restarts
- Multiple connection attempts from admin accounts
- InnoDB error messages in error log
Network Indicators:
- Unusual traffic patterns to MySQL port 3306 from admin accounts
- Multiple rapid connections followed by service disruption
SIEM Query:
source="mysql_error.log" AND ("crash" OR "hang" OR "InnoDB") OR source="mysql_slow.log" AND user IN (admin_users) AND connection_count > threshold