CVE-2016-5437 in MySQL Server
Summary
by MITRE
Unspecified vulnerability in Oracle MySQL 5.7.12 and earlier allows remote administrators to affect availability via vectors related to Server: Log.
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Analysis
by VulDB Data Team • 09/08/2022
The vulnerability identified as CVE-2016-5437 represents a significant availability risk within Oracle MySQL database systems, specifically affecting versions 5.7.12 and earlier. This flaw resides within the server logging component of the database management system, creating potential for remote administrators to disrupt system operations and compromise service availability. The unspecified nature of the vulnerability suggests that the exact technical mechanism remains undisclosed, though the impact is clearly defined as affecting system availability through logging-related vectors. This type of vulnerability is particularly concerning in database environments where continuous availability is critical for business operations, as it could enable attackers to cause denial of service conditions that would impact data accessibility and application functionality. The vulnerability's classification as affecting remote administrators indicates that the attack vector does not require physical access or local system privileges, making it accessible to attackers with network-level access to the database server.
The technical implementation of this vulnerability appears to be rooted in how MySQL handles logging operations within its server component, particularly in versions leading up to 5.7.12. When examining the broader context of database security, logging mechanisms are fundamental to system monitoring, auditing, and operational integrity, yet they can also become attack surfaces when not properly secured against malicious input or manipulation. The fact that this vulnerability specifically targets the Server: Log component suggests that the flaw may involve improper handling of log data, buffer overflows in log processing, or potential resource exhaustion through malicious log entries. This aligns with common patterns found in database security vulnerabilities where logging subsystems become entry points for availability attacks, particularly when systems do not properly validate or sanitize log inputs from remote administrators. From a cybersecurity perspective, this vulnerability demonstrates how seemingly benign system components like logging can become critical attack vectors when not properly secured against malicious manipulation.
The operational impact of CVE-2016-5437 extends beyond simple service disruption to potentially compromise entire database infrastructure availability. When remote administrators can manipulate logging components to affect system availability, it creates a scenario where attackers could cause database outages, data unavailability, or complete service degradation that would impact business continuity and data integrity. The consequences could be severe for organizations relying on MySQL databases for critical applications, as database availability directly correlates with application performance and user access. Organizations might experience cascading failures if database unavailability affects dependent applications, leading to broader business disruptions. This vulnerability particularly affects environments where database administrators have remote access capabilities, as the attack surface expands to include any administrative interface that interacts with logging mechanisms. The impact is amplified in high-availability environments where database systems are expected to maintain uptime and reliability, making such availability-focused vulnerabilities particularly dangerous.
Mitigation strategies for CVE-2016-5437 should focus on immediate patching of affected MySQL versions to 5.7.13 or later, where Oracle has addressed this specific vulnerability. Organizations should implement network segmentation and access controls to limit remote administrative access to database servers, reducing the potential attack surface for this type of availability-focused attack. Monitoring and logging of administrative activities should be enhanced to detect unusual patterns that might indicate exploitation attempts targeting the logging subsystem. Security teams should also consider implementing database firewalls or network access controls that specifically restrict access to logging-related administrative interfaces. The vulnerability's classification aligns with CWE-119 which addresses improper restriction of operations within a memory buffer, and may also relate to CWE-400 which covers resource exhaustion vulnerabilities. From an ATT&CK framework perspective, this vulnerability would map to techniques involving privilege escalation and denial of service, potentially enabling adversaries to move laterally within database environments or disrupt critical business services. Organizations should also conduct vulnerability assessments to identify other potential logging-related vulnerabilities and implement comprehensive database security monitoring to detect and respond to exploitation attempts.