CVE-2017-2248 in Lhaz+
Summary
by MITRE
Untrusted search path vulnerability in Installer of Lhaz+ version 3.4.0 and earlier allows an attacker to gain privileges via a Trojan horse DLL in an unspecified directory.
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Analysis
by VulDB Data Team • 10/26/2019
The vulnerability identified as CVE-2017-2248 represents a critical untrusted search path issue within the Installer component of Lhaz+ software version 3.4.0 and earlier. This flaw resides in the installer's dynamic link library loading mechanism, which fails to properly validate the source and integrity of dynamically loaded modules. The vulnerability stems from the installer's tendency to search for required DLL files in multiple directories without implementing proper security controls to verify the authenticity and origin of these modules. According to CWE-427, this constitutes an uncontrolled search path weakness where the application searches for libraries in directories that may be manipulated by adversaries, creating a potential privilege escalation vector.
The technical implementation of this vulnerability allows an attacker to place a malicious Trojan horse DLL in an unspecified directory that the installer will subsequently load. This occurs because the installer does not enforce strict path validation or use secure library loading practices. When the installer executes and attempts to load required dynamic libraries, it follows a predictable search order that includes user-writable directories. This behavior aligns with ATT&CK technique T1059.001 for execution through command-line interfaces and T1546.009 for DLL side-loading attacks. The vulnerability is particularly dangerous because it operates at the installation phase, where the system typically runs with elevated privileges, potentially allowing an attacker to execute code with administrative rights.
The operational impact of this vulnerability extends beyond simple code execution, as it enables privilege escalation attacks that can compromise entire systems. Attackers can exploit this weakness during the installation process of Lhaz+ or potentially during system maintenance activities when the installer runs with elevated permissions. The vulnerability affects any system where Lhaz+ is installed or where an attacker can influence the installation environment. This creates a persistent threat vector that can be leveraged across multiple systems, particularly in enterprise environments where software installation processes are automated or where users may not be security-aware. The flaw is especially concerning in environments where security controls are minimal and where attackers have the ability to manipulate system directories.
Mitigation strategies for CVE-2017-2248 should focus on implementing secure coding practices and system hardening measures. Organizations should immediately upgrade to Lhaz+ version 3.4.1 or later, which contains the necessary patches to address the untrusted search path vulnerability. System administrators should implement strict directory permissions and monitor for unauthorized DLL placements in system directories. The principle of least privilege should be enforced during installation processes, and the installer should be configured to use absolute paths for all library dependencies. Additionally, security monitoring should include detection of suspicious DLL loading activities and implementation of application control measures to prevent execution of unauthorized modules. Network segmentation and endpoint protection solutions should be configured to detect and block potential exploitation attempts. According to NIST SP 800-53 security controls, this vulnerability requires implementation of access control mechanisms and security awareness training to prevent exploitation through social engineering or automated attacks.