CVE-2025-46788: Zoom Workplace Desktop Info Disclosure

CVE-2025-46788 Overview

CVE-2025-46788 is a critical improper certificate validation vulnerability affecting Zoom Workplace for Linux before version 6.4.13. This security flaw may allow an unauthorized user to conduct information disclosure via network access. The vulnerability stems from inadequate certificate validation mechanisms, which could enable attackers to intercept or manipulate encrypted communications between Zoom clients and servers.

Critical Impact

Unauthorized users can exploit this certificate validation flaw to intercept sensitive communications and potentially disclose confidential information transmitted through Zoom Workplace on Linux systems.

Affected Products

• Zoom Workplace Desktop for Linux (versions prior to 6.4.13)

Discovery Timeline

• 2025-07-10 - CVE-2025-46788 published to NVD
• 2025-08-05 - Last updated in NVD database

Technical Details for CVE-2025-46788

Vulnerability Analysis

This vulnerability is classified under CWE-295 (Improper Certificate Validation), a category of cryptographic flaws where applications fail to properly verify the authenticity of SSL/TLS certificates during secure communications. When certificate validation is improperly implemented, applications may accept fraudulent or self-signed certificates, effectively neutralizing the security guarantees of encrypted communications.

In the context of Zoom Workplace for Linux, this flaw could allow a network-positioned attacker to present a malicious certificate that the application would incorrectly trust. This creates an opportunity for man-in-the-middle attacks where an adversary could intercept, view, or modify data transmitted between the Zoom client and Zoom's servers.

The vulnerability requires network access to exploit, meaning an attacker must be positioned to intercept network traffic between the victim and Zoom infrastructure. This could occur on compromised networks, public Wi-Fi hotspots, or through other network-level attack vectors.

Root Cause

The root cause of CVE-2025-46788 lies in the improper implementation of certificate validation routines within Zoom Workplace for Linux. Proper certificate validation should verify multiple aspects of a presented certificate, including:

• Certificate chain verification to a trusted root Certificate Authority (CA)
• Certificate expiration and validity period checks
• Hostname verification to ensure the certificate matches the intended server
• Certificate revocation status checks

When any of these validation steps are missing, improperly implemented, or can be bypassed, attackers can exploit the gap to present fraudulent certificates that the application will accept as legitimate.

Attack Vector

The attack vector for this vulnerability is network-based and does not require any privileges or user interaction. An attacker positioned on the network path between a Zoom Workplace Linux client and Zoom servers could:

1. Intercept TLS handshake requests from the vulnerable Zoom client
2. Present a fraudulent certificate (self-signed or issued by an untrusted CA)
3. Complete the TLS handshake due to the improper validation
4. Decrypt, inspect, or modify communications in transit
5. Re-encrypt and forward traffic to maintain the appearance of normal operation

This type of attack could expose sensitive meeting content, authentication credentials, chat messages, file transfers, and other confidential data processed by the Zoom application.

Detection Methods for CVE-2025-46788

Indicators of Compromise

• Unexpected certificate warnings or errors in network security monitoring tools when Zoom traffic is inspected
• TLS connections from Zoom clients accepting certificates not issued by legitimate Zoom infrastructure
• Network traffic anomalies showing Zoom connections routed through unexpected intermediary servers
• Unusual SSL/TLS handshake patterns in network logs involving Zoom endpoints

Detection Strategies

• Deploy network intrusion detection systems (NIDS) to monitor for certificate anomalies in Zoom traffic
• Implement certificate pinning validation at the network perimeter to detect mismatched certificates
• Use endpoint detection and response (EDR) solutions to monitor for suspicious Zoom process behavior
• Enable TLS inspection on network security appliances to validate certificate chains for Zoom communications

Monitoring Recommendations

• Monitor endpoint software inventory to identify systems running vulnerable Zoom Workplace versions (prior to 6.4.13)
• Review network logs for Zoom connections that may have been established with invalid or suspicious certificates
• Implement alerting for any Zoom Workplace for Linux installations that have not been updated to the patched version
• Track outbound connections from Zoom processes to identify any unexpected destination servers

How to Mitigate CVE-2025-46788

Immediate Actions Required

• Update Zoom Workplace for Linux to version 6.4.13 or later immediately on all affected systems
• Audit all Linux systems in the environment to identify installations of vulnerable Zoom Workplace versions
• Advise users to avoid using Zoom on untrusted networks until the patch is applied
• Consider temporarily restricting Zoom usage on Linux systems that cannot be immediately updated

Patch Information

Zoom has released version 6.4.13 of Zoom Workplace for Linux to address this vulnerability. Organizations should prioritize deployment of this update across all affected Linux systems. For detailed patch information and download links, refer to the Zoom Security Bulletin ZSB-25023.

Workarounds

• Restrict use of Zoom Workplace on Linux to trusted, secure networks until the patch can be applied
• Implement network-level certificate validation through security appliances as an additional defense layer
• Use VPN connections when accessing Zoom on potentially compromised networks to add an encryption layer
• Consider temporarily using Zoom's web client or alternative platforms on Linux systems pending the update

# Verify Zoom Workplace version on Linux systems
zoom --version

# Update Zoom Workplace via package manager (Debian/Ubuntu)
sudo apt update && sudo apt install zoom

# Update Zoom Workplace via package manager (RHEL/CentOS/Fedora)
sudo dnf update zoom