CVE-2016-1246 in libdbd-mysql-perl
Summary
by MITRE
Buffer overflow in the DBD::mysql module before 4.037 for Perl allows context-dependent attackers to cause a denial of service (crash) via vectors related to an error message.
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Analysis
by VulDB Data Team • 09/21/2022
The vulnerability identified as CVE-2016-1246 represents a critical buffer overflow flaw within the DBD::mysql Perl module, affecting versions prior to 4.037. This module serves as a database driver interface for connecting Perl applications to mysql databases, making it a fundamental component in many web applications and server environments. The vulnerability manifests when the module processes error messages, creating a scenario where malicious input can trigger memory corruption that leads to application instability.
The technical implementation of this buffer overflow occurs during error handling within the DBD::mysql module's interaction with mysql database connections. When the module encounters certain error conditions, it attempts to format and display error messages that exceed the allocated buffer space, causing memory corruption. This flaw falls under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability is context-dependent, meaning attackers must craft specific inputs that trigger the error handling path within the module's codebase, typically involving malformed database connection parameters or unexpected database responses.
The operational impact of this vulnerability extends beyond simple denial of service, as it can potentially enable more sophisticated attacks depending on the execution environment. When exploited, the buffer overflow causes the Perl application using the vulnerable DBD::mysql module to crash, resulting in service disruption for applications relying on database connectivity. In web application contexts, this translates to potential application downtime, user experience degradation, and possible information exposure through crash-related memory dumps. The vulnerability is particularly concerning in high-availability environments where database connectivity is essential for application functionality, as it can be leveraged to create persistent denial of service conditions.
Mitigation strategies for CVE-2016-1246 primarily focus on immediate patching of the DBD::mysql module to version 4.037 or later, which includes proper bounds checking for error message handling. System administrators should also implement network-level protections such as input validation firewalls and intrusion detection systems that can identify and block malicious input patterns targeting database connection interfaces. Additionally, application-level defenses including proper error handling, input sanitization, and regular security assessments can reduce the attack surface. Organizations should consider implementing the principle of least privilege for database connections and monitor for unusual error patterns that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability aligns with techniques involving privilege escalation and denial of service, specifically targeting the application layer and database interaction components. The vulnerability demonstrates how seemingly minor input validation flaws in database drivers can create significant security implications, emphasizing the importance of comprehensive security testing for all components in the application stack.