CVE-2023-34115 in Meeting SDK
Summary
by MITRE • 06/13/2023
Buffer copy without checking size of input in Zoom Meeting SDK before 5.13.0 may allow an authenticated user to potentially enable a denial of service via local access. This issue may result in the Zoom Meeting SDK to crash and need to be restarted.
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Analysis
by VulDB Data Team • 07/13/2023
The vulnerability identified as CVE-2023-34115 represents a classic buffer overflow condition within the Zoom Meeting SDK affecting versions prior to 5.13.0. This flaw occurs when the software copies data into a buffer without properly validating the size of the incoming input data, creating a potential attack surface for malicious actors who can manipulate the data flow. The vulnerability specifically impacts authenticated users who possess valid credentials to access the Zoom Meeting SDK environment, making it particularly concerning for organizations that rely heavily on secure video conferencing solutions. The issue stems from inadequate input validation mechanisms that should have been implemented to prevent buffer overflows during data processing operations.
The technical implementation of this vulnerability allows an authenticated user to exploit the buffer copy operation by providing input data that exceeds the allocated buffer size. When the Zoom Meeting SDK processes this oversized input without proper bounds checking, it can overwrite adjacent memory locations, leading to unpredictable behavior and system instability. This memory corruption directly results in the application crashing and requiring manual restart to restore functionality. The nature of the flaw places it squarely within the scope of CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient checks are performed on input data before copying it into fixed-size buffers. The vulnerability's local access requirement means that attackers must already have authenticated access to the system to exploit it, though this authentication requirement does not diminish its potential impact on system availability and service continuity.
From an operational standpoint, this vulnerability presents a significant risk to organizations relying on Zoom Meeting SDK for their communication infrastructure. The denial of service condition can disrupt critical business meetings, collaborative sessions, and remote work operations, potentially causing substantial productivity losses and financial impact. The need for manual system restarts creates additional operational overhead and can compound the disruption during critical communication periods. Security teams must consider this vulnerability as part of their broader threat landscape, particularly when evaluating the security posture of their video conferencing infrastructure and the potential for privilege escalation attacks that could lead to more severe consequences. The vulnerability's classification aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and represents a specific implementation weakness in the software's memory management practices that could potentially be leveraged for more sophisticated attacks if combined with other vulnerabilities.
Organizations should immediately implement the remediation measures provided by Zoom, including upgrading to version 5.13.0 or later, which contains the necessary patches to address the buffer overflow condition. System administrators should also conduct comprehensive vulnerability assessments to identify any other instances of similar buffer overflow conditions within their Zoom Meeting SDK implementations and related applications. Additionally, implementing network segmentation and access controls can help limit the potential impact of authenticated attacks by reducing the attack surface available to malicious users. The vulnerability highlights the critical importance of proper input validation and memory management practices in software development, particularly for applications handling sensitive communication data. Regular security testing and code reviews should be implemented to identify and remediate similar issues before they can be exploited in production environments, ensuring robust protection against both known and emerging threats in the cybersecurity landscape.