CVE-2019-6858 in MSX Configurator
Summary
by MITRE
A CWE-427:Uncontrolled Search Path Element vulnerability exists in MSX Configurator (Software Version prior to V1.0.8.1), which could cause privilege escalation when injecting a malicious DLL.
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Analysis
by VulDB Data Team • 03/25/2024
The vulnerability identified as CVE-2019-6858 represents a critical security flaw in MSX Configurator software versions prior to V1.0.8.1, classified under CWE-427: Uncontrolled Search Path Element. This weakness occurs when an application searches for files using a path that includes user-controllable elements without proper validation or sanitization. The vulnerability specifically manifests in the software's dynamic link library loading mechanism where the application fails to properly restrict the search paths used to locate required DLL files. Attackers can exploit this by placing a malicious DLL in a directory that appears earlier in the search path, allowing the system to load the malicious code instead of the legitimate library. This flaw creates a dangerous privilege escalation vector because the application typically runs with elevated privileges during configuration processes, making the malicious DLL execution potentially system-wide. The vulnerability stems from poor input validation practices and improper path resolution mechanisms within the software's library loading process, which violates fundamental security principles of least privilege and secure coding practices.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to gain elevated system privileges through a relatively straightforward attack vector. When MSX Configurator loads DLLs from a path that includes user-controllable elements, any user with the ability to create or modify files in the search path can inject malicious code that will execute with the privileges of the running application. This behavior aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. The vulnerability is particularly dangerous because it can be exploited during normal software usage when the application performs configuration tasks that require loading external libraries. Attackers can leverage this weakness to establish persistent backdoors, escalate privileges to system level access, or perform lateral movement within a network. The flaw essentially allows for arbitrary code execution with the privileges of the MSX Configurator process, which may include administrative rights depending on how the application is configured and deployed in enterprise environments.
Mitigation strategies for CVE-2019-6858 must address both the immediate vulnerability and broader security practices to prevent similar issues. The primary remediation involves updating MSX Configurator to version V1.0.8.1 or later, where the software properly validates search paths and implements secure library loading mechanisms. Organizations should also implement strict path validation controls, ensuring that applications only load DLLs from predetermined, secure directories. This includes implementing the principle of least privilege by running applications with minimal required permissions and avoiding the use of user-controllable paths in library resolution. Additional protective measures include implementing application whitelisting policies, using Windows Defender Application Control or similar technologies to restrict code execution, and conducting regular security assessments of software components. From a compliance perspective, this vulnerability highlights the importance of adhering to secure coding practices outlined in standards such as OWASP Top 10 and NIST SP 800-53, particularly controls related to input validation and privilege management. System administrators should also monitor for suspicious file creation patterns in application directories and implement proper file integrity monitoring to detect unauthorized DLL injections. The vulnerability serves as a reminder of the critical importance of secure software development practices and the need for regular security updates to protect against known exploitation techniques.