CVE-2014-0386 in MySQL Server
Summary
by MITRE
Unspecified vulnerability in the MySQL Server component in Oracle MySQL 5.1.71 and earlier, 5.5.33 and earlier, and 5.6.13 and earlier allows remote authenticated users to affect availability via unknown vectors related to Optimizer.
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Analysis
by VulDB Data Team • 06/08/2021
The vulnerability identified as CVE-2014-0386 represents a significant availability threat within Oracle MySQL database systems across multiple version ranges including 5.1.71 and earlier, 5.5.33 and earlier, and 5.6.13 and earlier. This issue resides within the MySQL Server component and specifically impacts the Optimizer module, which is responsible for determining the most efficient execution plan for database queries. The vulnerability affects remote authenticated users who can exploit it to disrupt service availability, making it particularly dangerous in production environments where database uptime is critical for business operations. The unspecified nature of the exact attack vectors means that security practitioners must consider multiple potential approaches that could leverage weaknesses in the query optimization process to cause system instability or complete service disruption.
The technical flaw manifests within the Optimizer component of MySQL Server, which is designed to analyze and select the most efficient execution strategy for SQL queries. When exploited, this vulnerability allows authenticated attackers to craft specific queries or manipulate database operations in ways that can cause the MySQL server to become unresponsive or crash entirely. The Optimizer module's handling of certain query structures or execution paths appears to contain logic flaws that can be triggered through carefully constructed inputs, potentially leading to denial of service conditions. This type of vulnerability falls under the category of availability attacks as defined by the attack pattern taxonomy, where the primary objective is to compromise the availability of system resources rather than to gain unauthorized access or extract data. The fact that this vulnerability affects multiple MySQL versions suggests a fundamental issue within the Optimizer architecture that was not properly addressed across different release branches.
The operational impact of CVE-2014-0386 extends beyond simple service disruption to potentially compromise entire database infrastructures that rely on MySQL for critical business operations. Organizations running affected MySQL versions face the risk of unplanned downtime, which can result in significant financial losses, service level agreement violations, and potential data integrity issues. The vulnerability's remote nature means that attackers do not require physical access to the database server, making it particularly dangerous in cloud environments or distributed systems where network exposure is common. When exploited successfully, the vulnerability can cause MySQL processes to terminate unexpectedly or enter into infinite loops, leading to complete service unavailability. The authentication requirement means that attackers must have valid credentials to exploit the vulnerability, but this still represents a significant risk as it can be exploited by compromised accounts or insiders with legitimate access rights.
Mitigation strategies for CVE-2014-0386 should focus on immediate patching of affected MySQL versions to the latest available releases that contain fixes for the Optimizer-related issues. Organizations should prioritize upgrading their MySQL installations to versions that have been verified to address this vulnerability, typically MySQL 5.1.72, 5.5.34, or 5.6.14 and later. Network segmentation and access controls should be implemented to limit the number of authenticated users who can connect to database servers, reducing the attack surface for potential exploitation. Database administrators should monitor for unusual query patterns or performance degradation that might indicate exploitation attempts, and implement proper logging and alerting mechanisms to detect anomalous behavior. The vulnerability's classification under CWE categories related to resource management and availability issues indicates that defensive measures should include robust error handling and resource allocation controls within database applications. Additionally, implementing database firewalls or query filtering mechanisms can help prevent malicious queries from reaching the vulnerable Optimizer component, while regular security assessments should verify that no other similar vulnerabilities exist within the database infrastructure. Organizations should also consider implementing redundant database systems or failover mechanisms to minimize the impact of potential exploitation attempts on business continuity.