CVE-2019-2630 in MySQL Server
Summary
by MITRE
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Replication). Supported versions that are affected are 8.0.15 and prior. Difficult to exploit 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 4.4 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/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-2019-2630 resides within Oracle MySQL Server's replication functionality, specifically affecting versions 8.0.15 and earlier. This flaw represents a significant security concern as it operates within the server's core replication mechanisms, which are fundamental to database consistency and data synchronization across distributed systems. The vulnerability's classification as a high-privilege attack vector indicates that it requires authenticated access but does not demand extensive exploitation capabilities, making it particularly dangerous in environments where database administrators maintain elevated privileges. The affected component falls under CWE-200, which encompasses information exposure vulnerabilities, though this instance manifests more specifically as a denial of service condition rather than direct information disclosure.
The technical nature of this vulnerability stems from improper handling of replication events within the MySQL server architecture, creating conditions where maliciously crafted replication data can trigger memory corruption or resource exhaustion. This flaw operates at the protocol level, accepting various network protocols as attack vectors while maintaining the requirement for network access from an authenticated high-privileged user. The vulnerability's exploitability difficulty rating of high suggests that while it requires specific authentication credentials, the attack surface remains accessible to those who already possess elevated privileges within the system. The complete denial of service impact occurs through either system hangs or repeated crashes that can render the database server completely unavailable to legitimate users, effectively disabling critical business operations.
The operational impact of CVE-2019-2630 extends beyond simple service disruption to encompass potential business continuity threats, particularly in environments where MySQL serves as a core component of enterprise applications. Organizations relying on replication for data redundancy, backup operations, or distributed database architectures face severe operational risks when this vulnerability is exploited. The availability impact rating of 4.4 on the CVSS scale indicates a moderate to high threat level that can significantly affect database performance and system reliability. Attackers leveraging this vulnerability can repeatedly crash the MySQL server, creating persistent service interruptions that require manual intervention to restore normal operations, potentially leading to extended downtime and data consistency issues across replicated database instances.
Mitigation strategies for this vulnerability should focus on immediate patch application to versions 8.0.16 and later, which contain the necessary fixes for the replication handling flaws. Organizations should also implement network segmentation controls to limit access to MySQL servers, particularly restricting replication protocol access to trusted networks and authenticated users only. The principle of least privilege must be enforced by ensuring that replication users possess only the minimum necessary permissions required for their operational functions. Additionally, monitoring and logging of replication activities should be enhanced to detect anomalous behavior patterns that might indicate exploitation attempts. Network-based intrusion detection systems should be configured to alert on unusual replication protocol traffic patterns, as outlined in the ATT&CK framework's methodology for database attack detection. System administrators should also consider implementing automated failover mechanisms and regular backup procedures to minimize the impact of potential exploitation events.