CVE-2018-0543 in Jtrim
Summary
by MITRE
Untrusted search path vulnerability in Jtrim 1.53c and earlier (Installer) allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.
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Analysis
by VulDB Data Team • 01/12/2020
The vulnerability identified as CVE-2018-0543 represents a critical untrusted search path issue within the Jtrim installer component version 1.53c and earlier. This flaw resides in the installer's dynamic link library loading mechanism, where the software fails to properly validate or sanitize the search paths used to locate required DLL dependencies. The vulnerability stems from the installer's reliance on a predictable but insecure search order that includes user-writable directories, creating an opportunity for privilege escalation attacks.
The technical implementation of this vulnerability allows an attacker to place a malicious Trojan horse DLL in an unspecified directory that is searched before legitimate system directories. When the vulnerable installer executes, it loads the malicious DLL instead of the intended legitimate library, effectively executing arbitrary code with the privileges of the installer process. This behavior directly aligns with CWE-426 Untrusted Search Path vulnerability classification, which specifically addresses the risk of executable code being loaded from untrusted locations due to insecure search path handling.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exfiltration. Attackers can leverage this weakness to install backdoors, modify system configurations, or establish persistent access points within targeted environments. The vulnerability affects organizations using Jtrim 1.53c or earlier versions, particularly those with less restrictive file system permissions or in environments where users have write access to directories in the system search path. This weakness creates a significant attack surface for adversaries who can exploit it during initial compromise phases or as part of broader attack campaigns.
Mitigation strategies should focus on immediate patching of affected Jtrim versions to 1.54 or later, which contain the necessary fixes for proper DLL search path validation. System administrators should implement strict file system permissions and audit access to directories in the search path, ensuring that only authorized users can write to these locations. The principle of least privilege should be enforced through careful configuration of installer execution contexts and system path management. Additionally, organizations should conduct comprehensive vulnerability assessments to identify other software components that may exhibit similar untrusted search path behaviors, aligning with ATT&CK technique T1068 for privilege escalation through insecure library loading. Network segmentation and monitoring solutions should be deployed to detect anomalous installer behavior or unexpected DLL loading activities that could indicate exploitation attempts.