Overview
This article provides a detailed analysis of CVE-2025-64740, a security vulnerability affecting the Zoom Workplace VDI Client for Windows. Specifically, the flaw stems from improper verification of cryptographic signatures within the installer. This improper validation may allow a local, authenticated user to elevate their privileges on the system.
Technical Details
CVE-2025-64740 centers around the Zoom Workplace VDI Client installer’s failure to adequately verify the cryptographic signature of critical components. An attacker with local access and valid user credentials could potentially replace legitimate installer files with malicious versions. Because the signature verification is insufficient, the modified installer could then execute with elevated privileges, granting the attacker greater control over the system. This usually involves exploiting weaknesses in how the installer handles digital signatures, such as failing to check the complete chain of trust or allowing for signature bypasses.
CVSS Analysis
Currently, the CVSS score and severity rating for CVE-2025-64740 are listed as N/A. This suggests that the vulnerability is either newly discovered, still under analysis, or has not yet been fully assessed by the relevant security authorities. However, the description indicates a local privilege escalation, which typically warrants a medium to high severity rating depending on the scope of impact and exploitability.
Possible Impact
The potential impact of CVE-2025-64740 could be significant. A successful exploit could allow an attacker to:
- Gain administrative access to the affected Windows system.
- Install malware or other malicious software.
- Steal sensitive data stored on the system.
- Compromise the security of the VDI environment.
- Potentially pivot to other systems within the network.
Mitigation and Patch Steps
Until an official patch is released by Zoom, the following mitigation steps are recommended:
- Monitor System Activity: Closely monitor Windows systems running the Zoom Workplace VDI Client for any suspicious activity, especially related to file modifications or privilege escalation attempts.
- Restrict Local Access: Limit user access to the VDI environment and implement strong authentication policies.
- Harden Systems: Implement standard system hardening practices, such as disabling unnecessary services and restricting write access to critical system directories.
- Stay Informed: Regularly check Zoom’s security advisories and patch releases for updates on this vulnerability.
Once Zoom releases a patch, it is critical to apply it immediately to all affected systems. Follow Zoom’s official patching instructions for the VDI client.