CVE-2012-5383 in MySQL
Summary
by MITRE
** DISPUTED ** Untrusted search path vulnerability in the installation functionality in Oracle MySQL 5.5.28, when installed in the top-level C:\ directory, might allow local users to gain privileges via a Trojan horse DLL in the "C:\MySQL\MySQL Server 5.5\bin" directory, which may be added to the PATH system environment variable by an administrator, as demonstrated by a Trojan horse wlbsctrl.dll file used by the "IKE and AuthIP IPsec Keying Modules" system service in Windows Vista SP1, Windows Server 2008 SP2, Windows 7 SP1, and Windows 8 Release Preview. NOTE: CVE disputes this issue because the unsafe PATH is established only by a separate administrative action that is not a default part of the MySQL installation.
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Analysis
by VulDB Data Team • 08/13/2025
The vulnerability described in CVE-2012-5383 represents a classic untrusted search path issue that exploits the trust placed in system directories during software installation processes. This weakness specifically affects Oracle MySQL 5.5.28 when installed in the root C:\ directory, creating a dangerous privilege escalation vector for local attackers. The flaw operates through a combination of installation path configuration and system PATH environment variable manipulation, allowing malicious actors to inject malicious code that executes with elevated privileges.
The technical exploitation mechanism relies on the Windows operating system's dynamic link library (DLL) loading behavior, where the system searches for required libraries in the order specified by the PATH environment variable. When MySQL is installed in C:\, and the installation process or subsequent administrative actions modify the PATH to include the MySQL bin directory, any malicious DLL placed in that location can be loaded and executed by legitimate system processes. The vulnerability is particularly concerning because it leverages the wlbsctrl.dll Trojan horse file, which is associated with the IKE and AuthIP IPsec Keying Modules service, a legitimate Windows component that runs with elevated privileges. This creates a perfect storm where malicious code can execute with system-level permissions.
This vulnerability aligns with CWE-427, which specifically addresses Uncontrolled Search Path Element, and demonstrates how improper PATH handling can lead to privilege escalation attacks. The operational impact extends beyond simple code execution, as it can enable attackers to establish persistent access, escalate privileges, or compromise the entire system. The attack vector is particularly insidious because it requires minimal user interaction beyond the initial administrative action that modifies the PATH, making it difficult to detect and prevent through standard security measures.
The vulnerability's disputed nature stems from the fact that the unsafe PATH configuration is not part of the default MySQL installation process but rather results from separate administrative actions. However, this does not diminish its security implications, as it highlights a critical design flaw in how installation processes interact with system security configurations. The issue demonstrates the importance of least privilege principles and proper security hardening during software deployment. Organizations should be aware that even seemingly benign installation procedures can create dangerous security vulnerabilities when combined with administrative practices that modify system paths without proper security consideration.
From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and persistence mechanisms, specifically leveraging the T1068 (Exploitation for Privilege Escalation) and T1547.001 (Registry Run Keys / Startup Folder) tactics. The attack requires the adversary to first gain access to a local account and then manipulate the PATH environment variable, which aligns with T1078 (Valid Accounts) and T1037 (Proxy Execution) techniques. The vulnerability's exploitation demonstrates how attackers can leverage legitimate system services to execute malicious code, making detection challenging and emphasizing the need for comprehensive monitoring of PATH modifications and DLL loading activities.
Security practitioners should implement several mitigation strategies to address this vulnerability, including conducting thorough security reviews of installation processes, implementing proper PATH management practices, and regularly auditing system PATH configurations. The most effective defense involves ensuring that installation procedures do not modify system PATH variables in ways that introduce security risks, combined with regular security assessments to identify and remediate any unauthorized PATH modifications. Additionally, organizations should implement application whitelisting policies and monitor for suspicious DLL loading activities to detect potential exploitation attempts.