CVE-2016-5443 in MySQL Server
Summary
by MITRE
Unspecified vulnerability in Oracle MySQL 5.7.12 and earlier allows local users to affect availability via vectors related to Server: Connection.
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Analysis
by VulDB Data Team • 09/08/2022
The vulnerability identified as CVE-2016-5443 represents a significant availability threat within Oracle MySQL database systems, specifically affecting versions 5.7.12 and earlier. This unspecified weakness resides within the server connection handling mechanisms of the MySQL database engine, creating potential pathways for local attackers to disrupt service availability. The vulnerability's classification as a local privilege escalation issue indicates that exploitation requires local system access, though the impact on system availability makes it particularly concerning for database administrators and security professionals. The affected component specifically relates to connection management within the MySQL server architecture, suggesting that improper handling of connection states or resource allocation could lead to service disruption.
The technical nature of this vulnerability stems from inadequate handling of connection-related operations within the MySQL server implementation. When local users interact with the database server through connection mechanisms, certain conditions can trigger unexpected behavior that results in service unavailability. This typically involves scenarios where connection resources are not properly managed or released, leading to resource exhaustion or deadlock conditions that prevent legitimate database operations from proceeding. The vulnerability may manifest through various connection protocols or authentication methods that the MySQL server supports, creating multiple potential attack vectors for local adversaries who understand the database internals. The unspecified nature of the vulnerability description suggests that the exact implementation flaw within the connection handling code has not been publicly detailed, though the impact on availability indicates a critical failure in the server's resource management or state transition handling.
From an operational perspective, this vulnerability poses substantial risks to database availability and system reliability in environments where local access is possible. Organizations running affected MySQL versions face potential service disruption that could impact business operations, data availability, and overall system stability. The local nature of the attack means that adversaries must already have access to the system, but this access is often more readily obtained than remote access to database systems. Database administrators and security teams must consider the potential for denial of service attacks that could render critical database services unavailable, potentially affecting applications that depend on MySQL for data persistence. The impact extends beyond simple service interruption to include potential data integrity concerns if connection failures occur during critical transactions or operations.
Mitigation strategies for CVE-2016-5443 should prioritize immediate patching of affected MySQL installations to the latest available versions that contain fixes for this vulnerability. Organizations should implement strict access controls and privilege management to limit local system access where possible, reducing the attack surface for potential exploitation. Regular monitoring of database connection activity and system resource usage can help detect anomalous behavior that might indicate exploitation attempts. System administrators should also consider implementing intrusion detection systems that can identify unusual connection patterns or resource consumption that may suggest exploitation of this vulnerability. The remediation process should include comprehensive testing of patched systems to ensure that the vulnerability is properly addressed without introducing compatibility issues with existing applications or database operations. Security teams should also review their incident response procedures to ensure they can quickly address any availability issues that may arise from exploitation attempts. This vulnerability aligns with CWE-119 which addresses memory safety issues, and may relate to ATT&CK techniques involving privilege escalation and denial of service operations.