CVE-2017-2215 in Setup File of Advance Preparation
Summary
by MITRE
Untrusted search path vulnerability in Installer of "Setup file of advance preparation" (jizen_setup.exe) (The version which was available on the website prior to 2017 June 12) allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.
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Analysis
by VulDB Data Team • 10/24/2019
The vulnerability identified as CVE-2017-2215 represents a critical untrusted search path issue within the installer component of a software package known as "Setup file of advance preparation" or jizen_setup.exe. This flaw specifically affects versions of the software that were distributed prior to June 12, 2017, indicating that the vulnerability has been present for an extended period without proper remediation. The installer process demonstrates a classic privilege escalation vector through dynamic link library (DLL) loading mechanisms that fail to properly validate the source and integrity of dynamically loaded modules.
The technical root cause of this vulnerability stems from the installer's improper handling of the Windows DLL search order mechanism. When the jizen_setup.exe installer executes, it searches for required DLL dependencies in a predictable sequence that includes the current working directory and user-writable locations. This behavior creates an opportunity for attackers to place malicious DLL files in directories that are searched before legitimate system libraries, allowing the attacker's code to execute with the privileges of the installer process. The vulnerability manifests as a failure to implement proper DLL isolation and path validation, which aligns with CWE-426, a well-documented weakness related to the execution of untrusted code through insecure search paths.
The operational impact of this vulnerability is significant as it enables attackers to achieve privilege escalation from standard user level to system level execution. When a user executes the vulnerable installer, the malicious DLL loaded from an attacker-controlled directory can execute with elevated privileges, potentially allowing for complete system compromise. This type of vulnerability is particularly dangerous because it can be exploited without requiring special privileges or complex attack vectors, making it accessible to adversaries with minimal technical expertise. The attack vector involves placing a specially crafted DLL file in a directory that will be searched by the installer, effectively creating a Trojan horse scenario where legitimate installation processes become attack vectors.
From a cybersecurity perspective, this vulnerability demonstrates the importance of proper software supply chain security and the dangers of insecure dynamic loading practices. The ATT&CK framework classification for this type of vulnerability would include techniques such as "DLL Side-Loading" and "Exploitation for Privilege Escalation" under the execution and privilege escalation categories respectively. Organizations should implement comprehensive mitigation strategies including application whitelisting, proper file system permissions, and regular security audits of installation packages. The vulnerability also underscores the necessity of implementing secure coding practices that enforce explicit path resolution for DLL loading operations, ensuring that only trusted and verified modules are loaded into memory. Additionally, system administrators should conduct regular vulnerability assessments to identify and remediate similar issues in legacy software components that may continue to be in use within enterprise environments.