CVE-2022-22787 in Client for Meetings
Summary
by MITRE • 05/18/2022
The Zoom Client for Meetings (for Android, iOS, Linux, macOS, and Windows) before version 5.10.0 fails to properly validate the hostname during a server switch request. This issue could be used in a more sophisticated attack to trick an unsuspecting users client to connect to a malicious server when attempting to use Zoom services.
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Analysis
by VulDB Data Team • 05/26/2022
The vulnerability identified as CVE-2022-22787 represents a critical hostname validation flaw within the Zoom Client for Meetings across multiple operating systems including Android, iOS, Linux, macOS, and Windows platforms. This issue stems from insufficient input validation mechanisms that fail to properly verify the authenticity and legitimacy of hostnames when users attempt to switch between different Zoom servers. The vulnerability exists in versions prior to 5.10.0 and creates a significant security risk by allowing potential attackers to manipulate the client's server connection behavior through deceptive hostname manipulation techniques.
The technical flaw manifests when the Zoom client processes server switch requests without adequate hostname validation, enabling attackers to craft malicious hostnames that could redirect users to compromised servers. This weakness falls under the broader category of insecure input validation as defined by CWE-20, specifically addressing improper validation of hostname parameters during network communication setup. The vulnerability creates an attack surface where threat actors can exploit the client's trust in server responses to perform man-in-the-middle attacks or redirect users to phishing servers that mimic legitimate Zoom infrastructure. The flaw operates at the application layer of the network stack, affecting the client's ability to establish secure connections and maintain proper authentication boundaries.
The operational impact of this vulnerability extends beyond simple redirection attacks, as it enables sophisticated social engineering campaigns where users might be unknowingly directed to malicious servers that appear legitimate. Attackers can leverage this weakness to intercept user credentials, capture session data, or deploy malware through compromised server connections. The vulnerability particularly affects organizations relying on Zoom for secure meetings, as it undermines the integrity of the client-server communication channel and creates opportunities for credential theft or data exfiltration. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1190, which describes the use of phishing and social engineering to gain access to systems through manipulated network connections, making it a significant concern for enterprise security postures.
Organizations should prioritize immediate remediation by upgrading all Zoom client installations to version 5.10.0 or later, which includes proper hostname validation mechanisms. Security teams should implement network monitoring to detect unusual hostname resolution patterns or connections to unknown servers. Additional mitigations include deploying network access controls that restrict outbound connections to known Zoom infrastructure, implementing DNS security measures, and conducting user awareness training about suspicious connection prompts. The vulnerability demonstrates the importance of proper input validation in client applications and highlights the need for robust certificate pinning mechanisms to prevent unauthorized server impersonation. Organizations should also consider implementing zero-trust network principles where all connections are validated regardless of source or destination, reducing the attack surface available to threat actors exploiting this particular weakness in the Zoom client implementation.