CVE-2024-42439 in Workplace Desktop App
Summary
by MITRE • 08/14/2024
Untrusted search path in the installer for Zoom Workplace Desktop App for macOS and Zoom Meeting SDK for macOS before 6.1.0 may allow a privileged user to conduct an escalation of privilege via local access.
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Analysis
by VulDB Data Team • 08/29/2024
The vulnerability identified as CVE-2024-42439 represents a critical security flaw in the Zoom Workplace Desktop App for macOS and Zoom Meeting SDK for macOS versions prior to 6.1.0. This issue stems from an untrusted search path implementation within the installer component that creates opportunities for privilege escalation through local access vectors. The flaw specifically affects systems where the installer process does not properly validate or sanitize the search path used during installation, potentially allowing malicious actors with local privileges to manipulate the installation process and elevate their privileges.
The technical implementation of this vulnerability manifests through improper handling of the dynamic link library search path during the installation process. When the Zoom installer executes, it follows a predetermined sequence of directories to locate required libraries and components. The installer fails to properly validate or restrict this search path, allowing an attacker with local access to manipulate the environment by placing malicious libraries in directories that are searched before legitimate system directories. This behavior aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses situations where applications search for libraries or executables in directories that can be manipulated by attackers. The vulnerability creates a condition where the installer process loads malicious code from attacker-controlled locations, effectively bypassing normal security controls that would otherwise prevent such unauthorized code execution.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass broader system compromise capabilities. An attacker with local user access can leverage this flaw to execute arbitrary code with elevated privileges, potentially leading to complete system compromise. This vulnerability is particularly concerning in enterprise environments where Zoom applications are widely deployed, as it could enable attackers to gain administrative access to workstations and potentially move laterally within networks. The local access requirement means that the vulnerability is accessible to anyone with physical or remote access to a target system, making it particularly dangerous in shared or unsecured environments. The privilege escalation capability directly maps to ATT&CK technique T1068 Privilege Escalation, where adversaries use legitimate system tools to gain higher privileges and access to restricted resources.
Mitigation strategies for CVE-2024-42439 should focus on immediate remediation through the installation of Zoom updates to version 6.1.0 or later, which addresses the untrusted search path implementation. Organizations should also implement additional security controls including regular system audits to verify the integrity of installed applications and their associated libraries. System administrators should consider implementing application whitelisting policies to restrict which executables can run on systems, particularly those that might be exploited through search path manipulation. The security community should also consider deploying endpoint detection and response solutions that can monitor for suspicious library loading behaviors and unauthorized privilege escalation attempts. Furthermore, organizations should conduct comprehensive vulnerability assessments to identify any other applications that might be susceptible to similar search path vulnerabilities, as this type of flaw is not unique to Zoom and can occur in many software installations. Regular security training for system administrators should emphasize the importance of validating installation processes and monitoring for unusual system behaviors that might indicate exploitation attempts.