CVE-2017-8137 in HedEx
Summary
by MITRE
HedEx Earlier than V200R006C00 versions has a dynamic link library (DLL) hijacking vulnerability due to calling the DDL file by accessing a relative path. An attacker could exploit this vulnerability to tamper with the DLL file, leading to DLL hijacking.
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Analysis
by VulDB Data Team • 01/11/2023
The vulnerability identified as CVE-2017-8137 affects HedEx software versions prior to V200R006C00, representing a critical dynamic link library hijacking weakness that stems from improper file path resolution mechanisms. This flaw manifests when the application attempts to load dynamic link libraries through relative paths rather than absolute paths, creating an exploitable condition where malicious actors can manipulate the loading process. The vulnerability resides in the software's failure to properly validate or secure the library loading sequence, allowing unauthorized code execution through manipulation of the dynamic link library components.
The technical implementation of this vulnerability follows a well-established pattern of DLL hijacking attacks where the target application searches for required libraries in a predictable sequence of directories. When HedEx software encounters a relative path reference for a DLL file, it traverses the system's search order, typically starting with the current working directory followed by system directories. This behavior creates an opportunity for attackers to place malicious DLL files in the current working directory or other locations within the search path, causing the application to load and execute unauthorized code instead of the legitimate library components. The vulnerability directly maps to CWE-426, which describes the insecure use of a command or library that allows attackers to manipulate the execution flow.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with persistent access to systems running affected HedEx versions. Once successfully exploited, the malicious DLL can execute with the privileges of the affected application, potentially enabling privilege escalation attacks or serving as a foothold for further system compromise. The attack vector is particularly concerning because it requires minimal user interaction and can be automated, making it attractive for widespread exploitation. This vulnerability aligns with ATT&CK technique T1059.001, which covers command and scripting interpreter usage, as the malicious code execution occurs through legitimate system interfaces that are not properly secured against manipulation.
Mitigation strategies for this vulnerability should focus on implementing absolute path references for all dynamic link library loading operations within the HedEx application. Software vendors should ensure that all library loading calls specify full paths rather than relying on relative paths or system search order resolution. Additionally, implementing proper access controls and file system permissions can prevent unauthorized modification of critical library files. System administrators should consider deploying application whitelisting solutions and monitoring for suspicious DLL loading activities. The remediation process requires careful application testing to ensure that absolute path implementations do not break existing functionality while addressing the security weakness. Organizations should also implement regular vulnerability assessments and maintain updated software versions to prevent exploitation of known vulnerabilities in legacy systems.