CVE-2025-30663: Zoom Meeting SDK Privilege Escalation Flaw

CVE-2025-30663 Overview

Time-of-check time-of-use race condition in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via local access.

Critical Impact

This vulnerability can be exploited locally to escalate privileges, potentially leading to unauthorized access and control of systems running affected Zoom Workplace applications.

Affected Products

• zoom meeting_software_development_kit
• zoom rooms
• zoom rooms_controller

Discovery Timeline

• 2025-05-14 - CVE CVE-2025-30663 published to NVD
• 2025-11-06 - Last updated in NVD database

Technical Details for CVE-2025-30663

Vulnerability Analysis

This vulnerability is a race condition identified within Zoom Workplace applications that could lead to privilege escalation. Time-of-check time-of-use (TOCTOU) flaws occur when a system check is followed by an operation, but the conditions validating the check may change in the interim, allowing attackers to insert malicious operations.

Root Cause

The race condition is primarily due to improper synchronization in critical code paths, allowing attackers to manipulate file permissions or access controls during the vulnerable window.

Attack Vector

Local access is required for successful exploitation, meaning the attacker needs authenticated access to the system.

// Example exploitation code (sanitized)
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

int main() {
    printf("Exploiting TOCTOU...");
    // Simulate race condition
    if (access("/tmp/vulnerable_file", W_OK) == 0) {
        chmod("/tmp/vulnerable_file", 0777);
        printf("Escalation achieved!");
    }
    return 0;
}

Detection Methods for CVE-2025-30663

Indicators of Compromise

• Unexpected changes in file permissions
• Unauthorized privilege elevations
• Changes in access control settings

Detection Strategies

Deploy monitoring to detect anomalous file permission changes, and use behavior-based detection methods to identify race condition exploits proactively.

Monitoring Recommendations

Implement file integrity monitoring on critical components and enable auditing of access and modification events in sensitive directories.

How to Mitigate CVE-2025-30663

Immediate Actions Required

• Conduct a security audit on file permissions
• Enforce strict user privilege management
• Educate users on security best practices

Patch Information

Refer to Zoom's Security Bulletin for patch details and application updates.

Workarounds

In environments where patches cannot be immediately applied, restrict local access and monitor for unusual behavior.

# Configuration example
chmod -R 0755 /path/to/zoom/apps
chown -R root:root /path/to/zoom/apps