CVE-2023-22058: Oracle MySQL Server DOS Vulnerability

CVE-2023-22058 Overview

CVE-2023-22058 is a Denial of Service vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the Server: DDL (Data Definition Language) component. This vulnerability allows a high-privileged attacker with network access via multiple protocols to cause a complete denial of service condition, resulting in a hang or frequently repeatable crash of the MySQL Server.

Critical Impact

Successful exploitation enables attackers with administrative privileges to completely disrupt MySQL database availability through targeted DDL operations.

Affected Products

• Oracle MySQL Server 8.0.33 and prior versions
• Fedora 37, 38, and 39
• NetApp Active IQ Unified Manager (VMware vSphere and Windows)
• NetApp OnCommand Insight
• NetApp OnCommand Workflow Automation
• NetApp SnapCenter

Discovery Timeline

• 2023-07-18 - CVE-2023-22058 published to NVD
• 2023-07-18 - Oracle releases security patch in CPU July 2023
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-22058

Vulnerability Analysis

This vulnerability resides in the DDL component of MySQL Server, which handles database schema operations such as CREATE, ALTER, and DROP statements. The flaw allows a privileged attacker to trigger an uncontrolled resource consumption or logic error that leads to server instability. While the attack requires high privileges (administrative access), the impact on availability is significant as it can cause complete service disruption.

The vulnerability is difficult to exploit, requiring specific conditions and timing to trigger the crash condition. However, once exploited, the attack can be repeated frequently, making it a persistent threat to database availability in enterprise environments.

Root Cause

The root cause stems from improper handling of certain DDL operations within the MySQL Server engine. When specific sequences of schema manipulation commands are processed under certain conditions, the server fails to properly manage internal resources or state, leading to a crash or hang condition. Oracle has not disclosed the specific technical details of the flaw to prevent exploitation.

Attack Vector

The attack vector is network-based, requiring the attacker to have authenticated network access to the MySQL Server with high privileges (such as DBA or administrative roles). The attacker would need to:

1. Establish an authenticated connection to the MySQL Server
2. Execute specific DDL commands that trigger the vulnerability
3. Cause the server to enter a hung state or crash

Due to the high complexity of exploitation, this vulnerability requires specific knowledge of the triggering conditions and appropriate timing of DDL operations.

Since no verified exploit code is available, the vulnerability mechanism involves sending malformed or specifically crafted DDL statements that exploit the parsing or execution logic within the MySQL Server's DDL handler. Technical details are available in the Oracle Security Alert CPU July 2023.

Detection Methods for CVE-2023-22058

Indicators of Compromise

• Unexpected MySQL Server crashes or hangs correlating with DDL operations
• Abnormal patterns of DDL statements from privileged accounts
• MySQL error logs showing repeated crash signatures in DDL-related code paths
• Service availability interruptions following administrative database operations

Detection Strategies

• Monitor MySQL error logs for crash signatures referencing DDL component functions
• Implement audit logging for all DDL operations from privileged accounts
• Configure alerting for MySQL service restarts or availability interruptions
• Review slow query logs for unusual DDL statement patterns

Monitoring Recommendations

• Enable MySQL General Query Log temporarily to capture DDL activity during investigations
• Implement database activity monitoring (DAM) solutions to track privileged user actions
• Set up health checks to detect MySQL Server unavailability
• Configure SIEM rules to correlate MySQL crashes with preceding DDL operations

How to Mitigate CVE-2023-22058

Immediate Actions Required

• Upgrade MySQL Server to version 8.0.34 or later immediately
• Review and restrict administrative privileges to essential personnel only
• Implement network segmentation to limit access to MySQL Server ports
• Enable audit logging for all privileged database operations

Patch Information

Oracle has addressed this vulnerability in the Critical Patch Update (CPU) released in July 2023. The fix is included in MySQL Server version 8.0.34 and later. Organizations should apply the patch by following the official Oracle Security Alert CPU July 2023 guidance.

For systems using bundled MySQL through third-party products:

• Fedora users should apply updates per the Fedora Package Announcements
• NetApp customers should refer to NetApp Security Advisory NTAP-20230725-0005

Workarounds

• Implement strict access controls limiting DDL privileges to only essential administrators
• Deploy MySQL Proxy or firewall rules to filter potentially malicious DDL patterns
• Configure MySQL connection limits for administrative accounts
• Enable MySQL Enterprise Firewall if available to restrict query patterns

# Configuration example - Restrict administrative privileges
# Review and limit users with DDL privileges
mysql -u root -p -e "SELECT user, host FROM mysql.user WHERE Super_priv='Y' OR Create_priv='Y' OR Alter_priv='Y' OR Drop_priv='Y';"

# Revoke unnecessary DDL privileges from non-essential accounts
# REVOKE CREATE, ALTER, DROP ON *.* FROM 'username'@'host';

# Enable general query logging for audit purposes (use temporarily due to performance impact)
# SET GLOBAL general_log = 'ON';
# SET GLOBAL general_log_file = '/var/log/mysql/general.log';