CVE-2016-5634 in MySQL Server
Summary
by MITRE
Unspecified vulnerability in Oracle MySQL 5.7.13 and earlier allows remote administrators to affect availability via vectors related to RBR.
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Analysis
by VulDB Data Team • 09/25/2024
The vulnerability identified as CVE-2016-5634 represents a significant availability risk within Oracle MySQL database systems, specifically affecting versions 5.7.13 and earlier. This issue manifests as an unspecified weakness that can be exploited by remote administrative actors to compromise system availability, making it particularly dangerous in production environments where database uptime is critical. The vulnerability's classification under the broader category of database availability issues indicates that attackers can potentially disrupt normal database operations through manipulation of specific replication mechanisms.
The technical flaw is specifically associated with Row-Based Replication (RBR) within the MySQL database engine, which suggests that the vulnerability exploits weaknesses in how the system handles row-level replication operations. Row-Based Replication is a critical feature in MySQL that allows for more granular control over data synchronization between master and slave servers, but this particular weakness indicates that the replication process contains a flaw that can be leveraged to cause system instability. The vulnerability's designation as affecting "administrators" suggests that it requires elevated privileges for exploitation, though the impact extends beyond simple privilege escalation to system availability compromise.
From an operational perspective, this vulnerability creates substantial risk for database administrators and system operators who rely on MySQL's replication capabilities for data consistency and disaster recovery. When exploited, the vulnerability can lead to complete service disruption, requiring manual intervention to restore database availability. The remote nature of the attack vector means that adversaries can potentially exploit this weakness from outside the organization's network, amplifying the security implications. Organizations running affected MySQL versions face potential data loss, service interruptions, and increased operational overhead during incident response activities.
The security implications extend beyond simple availability disruption to encompass broader system integrity concerns, as replication failures can lead to data inconsistencies across database clusters. This vulnerability aligns with CWE-119, which addresses weaknesses in memory handling and data access patterns that can lead to system instability. The attack surface is particularly concerning given that many organizations depend on MySQL's replication features for high availability configurations, making the exploitation of this vulnerability potentially devastating for business continuity. Security professionals should consider this weakness in the context of the MITRE ATT&CK framework, specifically under the availability impact category where attackers can leverage database-specific weaknesses to disrupt services.
Mitigation strategies should prioritize immediate patching of affected MySQL installations to the latest available versions that contain fixes for this vulnerability. Organizations should also implement network segmentation to limit access to database administrative interfaces and establish monitoring protocols to detect unusual replication behavior that might indicate exploitation attempts. Additionally, implementing redundant database configurations and regular backup procedures can help minimize the impact of potential exploitation while patches are deployed. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date database software and the need for comprehensive security testing of replication mechanisms in database environments.