CVE-2019-2802 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 8.0.16 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 • 11/05/2024
The vulnerability identified as CVE-2019-2802 resides within the MySQL Server component of Oracle MySQL, specifically within the Server: Optimizer subcomponent. This flaw affects all supported versions of MySQL 8.0.16 and earlier, representing a significant security concern for database administrators and system operators who rely on MySQL for critical data operations. The vulnerability's classification as easily exploitable indicates that attackers with relatively low barriers to entry can leverage this weakness, making it particularly dangerous in production environments where database availability is paramount.
The technical nature of this vulnerability involves a flaw within the query optimization phase of MySQL's server operations, where the optimizer component processes and executes database queries. When exploited, this vulnerability allows a high privileged attacker with network access through multiple protocols to compromise the MySQL server's stability. The attack vector requires network access, meaning that an attacker who can establish communication with the MySQL server can potentially trigger the vulnerability. The CVSS score of 4.9 indicates a moderate to high severity impact, with the primary concern being availability rather than confidentiality or integrity.
The operational impact of this vulnerability manifests as an unauthorized ability to cause a hang or frequently repeatable crash of the MySQL server, effectively resulting in a complete denial of service condition. This type of attack can severely disrupt database operations, causing downtime that may affect business-critical applications relying on MySQL for data storage and retrieval. The complete DOS condition means that the server becomes unresponsive and requires manual intervention or restart to restore normal operations, potentially leading to significant business disruption and data access issues.
From a cybersecurity perspective, this vulnerability aligns with CWE-119, which deals with "Improper Restriction of Operations within the Bounds of a Memory Buffer," and may also relate to CWE-20, "Improper Input Validation," as the issue likely stems from inadequate validation of query optimization parameters. The attack pattern follows the MITRE ATT&CK framework's T1499.004 technique, which involves "Endpoint Denial of Service" through the manipulation of application resources, specifically targeting database server availability. Organizations should implement immediate mitigations including applying the latest security patches from Oracle, restricting network access to MySQL servers, implementing proper access controls, and monitoring for unusual network activity that might indicate exploitation attempts. Additionally, network segmentation and the principle of least privilege should be enforced to minimize the potential impact if the vulnerability is successfully exploited.