CVE-2025-30663: Escalation of Privilege Vulnerability in Zoom Workplace Apps

Overview

The cybersecurity landscape is continually evolving, with new vulnerabilities being discovered regularly. One such vulnerability, identified as CVE-2025-30663, has been found in certain Zoom Workplace Apps. This vulnerability allows an authenticated user to escalate their privileges via local access due to a time-of-check time-of-use race condition. This kind of vulnerability, if left unpatched, can lead to severe consequences for the affected systems, including potential system compromise or data leakage.
Zoom’s popularity and widespread use, especially in the current remote working environment, makes this vulnerability particularly concerning. It is crucial for organizations that use Zoom Workplace Apps to understand the nature of this vulnerability and take appropriate mitigation measures.

Vulnerability Summary

CVE ID: CVE-2025-30663
Severity: High (CVSS score: 8.8)
Attack Vector: Local
Privileges Required: User
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Zoom Workplace App | All versions prior to the latest patch

How the Exploit Works

The exploit leverages a time-of-check time-of-use (TOCTOU) race condition that exists in certain Zoom Workplace Apps. A TOCTOU race condition occurs when a system’s state changes between the checking of a condition (the time of check) and the use of the results of that check (the time of use). An attacker who has authenticated access to the system can exploit this race condition to elevate their privileges.

Conceptual Example Code

The actual code would depend on the specific details of the vulnerability. However, conceptually, an attacker might exploit this vulnerability by first checking the condition (for example, checking the permissions of a file), then manipulating the state of the system (such as changing the file’s permissions) before the system uses the result of the initial check.

# Time of check
if [ "$(stat -c %a file.txt)" = "644" ]; then
# Time of use
chmod 777 file.txt
fi

In this conceptual example, the attacker checks if the permissions of `file.txt` are `644`. If they are, the attacker changes the permissions to `777`, potentially giving them unauthorized access to the file. The system, meanwhile, proceeds based on the initial check and does not realize that the permissions have changed.
Please note that this is a simplified example and actual exploitation of the CVE-2025-30663 vulnerability would likely be more complex.