CVE-2024-21096: Oracle MySQL Privilege Escalation Flaw

CVE-2024-21096 Overview

CVE-2024-21096 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the mysqldump client component. This vulnerability allows an unauthenticated attacker with local access to the infrastructure where MySQL Server executes to compromise the MySQL Server. Successful exploitation can result in unauthorized data modification, unauthorized read access to a subset of MySQL Server accessible data, and the ability to cause a partial denial of service.

Critical Impact

An attacker with local access can manipulate MySQL Server data, access sensitive information, and disrupt database availability without requiring authentication credentials.

Affected Products

• Oracle MySQL 8.0.36 and prior
• Oracle MySQL 8.3.0 and prior
• NetApp Active IQ Unified Manager (VMware vSphere and Windows)
• NetApp OnCommand Insight
• NetApp OnCommand Workflow Automation
• NetApp SnapCenter
• Fedora 39 and 40
• Debian Linux 11.0

Discovery Timeline

• April 16, 2024 - CVE-2024-21096 published to NVD
• December 6, 2024 - Last updated in NVD database

Technical Details for CVE-2024-21096

Vulnerability Analysis

This vulnerability resides in the mysqldump client utility, a widely-used tool for creating logical backups of MySQL databases. The vulnerability is classified as difficult to exploit, requiring the attacker to have local access to the system where MySQL Server is running. Once exploited, the attacker can achieve three distinct impacts: unauthorized modification of data (insert, update, or delete operations), unauthorized read access to database contents, and the ability to degrade service availability through partial denial of service conditions.

The local attack vector requirement means that remote exploitation over a network is not directly possible. However, in shared hosting environments, containerized deployments, or systems where multiple users have local access, this vulnerability presents a meaningful risk. The fact that no authentication is required for exploitation increases the attack surface among users with local system access.

Root Cause

While Oracle has not disclosed the specific root cause details (classified as NVD-CWE-noinfo), the vulnerability exists within the mysqldump client component's handling of data during backup operations. The high attack complexity suggests that specific conditions must be met for successful exploitation, potentially involving race conditions, improper input handling, or inadequate privilege separation within the mysqldump process.

Attack Vector

The attack requires local access to the infrastructure where MySQL Server executes. An unauthenticated attacker positioned on the same system can exploit this vulnerability without requiring database credentials. The exploitation path likely involves manipulating the mysqldump process during backup operations to gain unauthorized access to data or disrupt service availability.

The attack scenario would involve an attacker with local system access monitoring or interfering with mysqldump operations. Due to the high complexity rating, successful exploitation requires precise timing or specific system configurations rather than a straightforward attack methodology.

Detection Methods for CVE-2024-21096

Indicators of Compromise

• Unexpected mysqldump processes running under unusual user contexts or with anomalous command-line arguments
• Unauthorized database backup files appearing in unexpected locations
• Database audit logs showing unexplained read or modification operations coinciding with backup windows
• Anomalous system calls or file access patterns during mysqldump execution

Detection Strategies

• Enable MySQL Enterprise Audit or general query logging to capture all database operations during backup windows
• Implement file integrity monitoring on mysqldump binaries and backup destination directories
• Monitor process execution with tools that capture parent-child process relationships and command-line arguments
• Deploy endpoint detection solutions capable of identifying suspicious local process behavior

Monitoring Recommendations

• Configure alerts for mysqldump processes initiated by non-standard users or service accounts
• Monitor for database operations occurring outside scheduled backup windows
• Implement baseline monitoring for normal mysqldump behavior and alert on deviations
• Review system authentication logs for local access attempts correlating with backup schedules

How to Mitigate CVE-2024-21096

Immediate Actions Required

• Upgrade Oracle MySQL to version 8.0.37 or later, or 8.4.0 or later where the vulnerability has been addressed
• Restrict local system access to MySQL Server infrastructure to only essential personnel and service accounts
• Review and audit all users with local access to systems running MySQL Server
• Implement strict file system permissions on mysqldump binaries and backup directories

Patch Information

Oracle addressed this vulnerability in the April 2024 Critical Patch Update. Organizations should consult the Oracle Critical Patch Update for official patch guidance. Additionally, downstream vendors have released their own advisories:

• NetApp Security Advisory for affected NetApp products
• Fedora Package Announcements for Fedora 39 and 40
• Debian LTS Security Announcement for Debian Linux 11.0

Workarounds

• Implement strict access controls to limit local system access to the MySQL Server infrastructure
• Run mysqldump operations only from dedicated, hardened backup servers with restricted user access
• Use network segmentation to isolate database servers from general-purpose systems
• Consider implementing MySQL Enterprise Backup as an alternative to mysqldump for sensitive environments

# Restrict mysqldump binary permissions
chmod 750 /usr/bin/mysqldump
chown root:mysql /usr/bin/mysqldump

# Ensure backup directories have appropriate permissions
chmod 700 /var/backups/mysql
chown mysql:mysql /var/backups/mysql