CVE-2019-2434 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Parser). Supported versions that are affected are 5.7.24 and prior and 8.0.13 and prior. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/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-2019-2434 resides within the MySQL Server component, specifically within the Server: Parser subcomponent of Oracle MySQL database systems. This flaw affects multiple version ranges including all 5.7.x versions up to and including 5.7.24, as well as 8.0.x versions up to and including 8.0.13. The vulnerability represents a significant security concern as it operates within the core parsing functionality of the database server, making it a critical component for potential exploitation. The affected parser component is responsible for processing SQL statements and commands that are sent to the MySQL server, which makes this vulnerability particularly dangerous as it can be triggered through normal database communication protocols.
The technical nature of this vulnerability manifests as a flaw in how the MySQL Server processes certain input data through its parser module. This particular weakness allows a low-privileged attacker who has network access to the MySQL server to execute malicious payloads that can cause the server to hang or repeatedly crash. The vulnerability's exploitability is classified as easily accessible due to the low privilege requirements and the fact that it can be triggered through multiple network protocols. The parser component's failure to properly validate or handle specific input sequences leads to a denial of service condition that can completely disrupt database operations. This type of vulnerability falls under the CWE-129 weakness category, which represents improper input validation, and specifically relates to CWE-134 which deals with use of sprintf() with untrusted data.
The operational impact of CVE-2019-2434 is severe and directly affects the availability of MySQL database services. Successful exploitation results in a complete denial of service condition where the MySQL server becomes unresponsive or crashes repeatedly, rendering database operations impossible for legitimate users and applications. This disruption can have cascading effects throughout enterprise environments where MySQL databases serve as critical backend systems for applications, web services, and business operations. The vulnerability's CVSS 3.0 score of 6.5 indicates a high severity level with availability impacts, reflecting the potential for significant business disruption. Organizations relying on MySQL for their database infrastructure face substantial risk of service interruptions, data access delays, and potential revenue loss during periods when the database service is unavailable due to this vulnerability.
Mitigation strategies for CVE-2019-2434 should prioritize immediate patching of affected systems to the latest stable releases of MySQL that contain fixes for this parser vulnerability. Organizations should implement network segmentation and access controls to limit exposure of MySQL servers to untrusted networks, reducing the attack surface available to potential adversaries. The principle of least privilege should be enforced by ensuring that database accounts have only the necessary permissions required for their specific functions, as this reduces the potential impact of successful exploitation. Network monitoring and intrusion detection systems should be configured to detect unusual patterns of database access that might indicate exploitation attempts. Additionally, regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues before they can be exploited. The ATT&CK framework's T1499 technique for network denial of service should be considered when developing defensive strategies, as this vulnerability enables similar attack patterns that can disrupt service availability. Organizations should also maintain comprehensive backup and recovery procedures to ensure rapid restoration of database services in case of successful exploitation.