CVE-2019-2507 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.6.42 and prior, 5.7.24 and prior and 8.0.13 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
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Analysis
by VulDB Data Team • 06/28/2023
The vulnerability identified as CVE-2019-2507 resides within the MySQL Server component, specifically within the Server: Optimizer subcomponent of Oracle MySQL database systems. This flaw affects multiple version ranges including 5.6.42 and earlier, 5.7.24 and earlier, and 8.0.13 and earlier versions, representing a significant portion of MySQL's historical release lineage. The vulnerability's classification as easily exploitable indicates that attackers with high privileges and network access can leverage this weakness through multiple protocols, making it particularly concerning for database environments where such access might be available. The CVSS 3.0 base score of 4.9 reflects the availability impact, with the vector AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H indicating network-based exploitation requiring low complexity but high privilege levels, with no user interaction required and universal scope.
The technical nature of this vulnerability manifests as a flaw in the query optimizer component that processes SQL statements and generates execution plans for database operations. When an attacker crafts specific queries or triggers certain database operations that exploit this optimizer weakness, the system can experience complete denial of service conditions. The vulnerability can cause the MySQL server to hang indefinitely or crash repeatedly, effectively rendering the database service unavailable to legitimate users and applications. This type of vulnerability represents a classic availability attack vector that can severely impact business operations and database reliability, particularly in environments where database uptime is critical for application functionality and data access.
From an operational perspective, this vulnerability creates significant risk for organizations relying on MySQL database systems, especially those with high-privilege accounts or network-accessible database servers. The requirement for high-privileged access means that attackers typically need valid database credentials or administrative access to exploit the vulnerability, but once achieved, the impact can be devastating. The vulnerability's potential to cause complete server hangs or frequent crashes can result in extended downtime, data unavailability, and potential financial losses for organizations dependent on their database infrastructure. The attack surface extends across multiple protocols including TCP/IP connections, making it accessible through various network interfaces and database client connections.
Organizations should implement immediate mitigation strategies including applying the relevant Oracle Critical Patch Update (CPU) releases that address this vulnerability, as well as implementing network segmentation and access controls to limit high-privilege database access. Database administrators should also consider implementing monitoring solutions to detect unusual patterns of database server behavior that might indicate exploitation attempts. The vulnerability aligns with CWE-119 which describes weaknesses in memory management and data handling, and represents a potential ATT&CK technique under the T1499 category for network denial of service attacks. Regular vulnerability assessments and patch management procedures should be strengthened to prevent similar issues in the future, while also ensuring that database servers are properly configured with minimal required privileges and network access restrictions.