CVE-2023-39211 in Desktop Client
Summary
by MITRE • 08/09/2023
Improper privilege management in Zoom Desktop Client for Windows and Zoom Rooms for Windows before 5.15.5 may allow an authenticated user to enable an information disclosure via local access.
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Analysis
by VulDB Data Team • 09/13/2023
The vulnerability identified as CVE-2023-39211 represents a critical privilege management flaw within the Zoom Desktop Client for Windows and Zoom Rooms for Windows software versions prior to 5.15.5. This issue stems from inadequate access control mechanisms that fail to properly enforce privilege boundaries, creating a pathway for authenticated users to exploit local system access for information disclosure purposes. The flaw specifically targets the Windows operating system implementations of these Zoom applications, which are widely deployed in enterprise environments for video conferencing and collaboration services.
The technical root cause of this vulnerability lies in the improper handling of user privileges and access controls within the Zoom client applications. When a user authenticates to the system, the software fails to adequately validate or restrict the permissions granted to that user session, particularly in scenarios involving local system access. This misconfiguration allows an authenticated user to escalate their privileges or access system resources that should otherwise be restricted. The vulnerability operates at the operating system level where the Zoom client maintains local processes and file access permissions, creating a potential attack surface that can be exploited through local access methods. According to CWE classification, this represents a weakness in privilege management where the system fails to properly enforce access control policies, specifically categorized under CWE-276 which deals with improper privileges.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a persistent security risk that can be exploited by both internal and external threat actors with local access to affected systems. An authenticated user who gains access to a machine running an unpatched Zoom client can potentially extract sensitive data from the system, including configuration files, user credentials, or other system information that may be stored locally. This risk is particularly concerning in enterprise environments where Zoom clients are frequently deployed across multiple devices and where users may have legitimate access to systems but could abuse their privileges. The vulnerability can be exploited through local access methods such as command line interfaces, file system access, or direct process manipulation, making it difficult to detect and prevent without proper security controls.
Security professionals should implement multiple layers of mitigation to address this vulnerability effectively. The primary recommendation involves immediate deployment of Zoom client updates to version 5.15.5 or later, which contain the necessary patches to correct the privilege management implementation. Organizations should also enforce strict access control policies and conduct regular privilege audits to ensure that users only have access to necessary system resources. Network segmentation and endpoint protection solutions should be configured to monitor for suspicious local access patterns and unauthorized privilege escalation attempts. Additionally, security teams should review and update their incident response procedures to account for potential information disclosure events that could result from this vulnerability, ensuring proper detection and containment protocols are in place. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques where adversaries leverage weak access control to gain elevated system privileges, making it essential for organizations to maintain robust security monitoring and access control mechanisms to prevent exploitation of such weaknesses.