CVE-2023-36535 in Zoom
Summary
by MITRE • 08/08/2023
Client-side enforcement of server-side security in Zoom clients before 5.14.10 may allow an authenticated user to enable information disclosure via network access.
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Analysis
by VulDB Data Team • 09/27/2024
The vulnerability identified as CVE-2023-36535 represents a critical security flaw in Zoom client software versions prior to 5.14.10 where the client-side implementation fails to properly enforce server-side security controls. This issue stems from a fundamental breakdown in the security architecture where the client application relies on server-side validation mechanisms that are not adequately replicated or enforced at the client level. The flaw specifically affects the authentication and authorization processes within the Zoom ecosystem, creating a scenario where an authenticated user can potentially bypass intended security restrictions through network-level manipulation. This represents a classic case of privilege escalation and information disclosure vulnerability that undermines the core security model of the platform.
The technical implementation of this vulnerability exploits a weakness in the client-server communication protocol where the Zoom client fails to independently validate security policies that should be enforced locally. When a user authenticates to the Zoom service, the client application should maintain strict adherence to server-side security configurations, including access controls and data protection measures. However, in affected versions, the client-side code does not properly implement the security checks that would normally prevent unauthorized information access. This allows malicious actors who have gained authenticated access to potentially manipulate network traffic or exploit client-side configurations to gain access to information that should otherwise be restricted. The vulnerability manifests when network access is leveraged to bypass the normal security enforcement mechanisms that should prevent unauthorized data disclosure.
The operational impact of CVE-2023-36535 extends beyond simple information disclosure to encompass potential compromise of sensitive meeting data, user communications, and organizational information. Attackers who exploit this vulnerability can potentially access confidential data from meetings, participant information, and other sensitive communications that are normally protected by Zoom's security architecture. This vulnerability is particularly concerning in enterprise environments where Zoom is used for business-critical communications, as it could lead to significant data breaches and compliance violations. The risk is amplified by the fact that the vulnerability requires only authenticated access, meaning that an attacker who has obtained valid credentials can exploit this flaw without requiring additional privileges or complex attack vectors. This aligns with ATT&CK technique T1078.004 which covers valid accounts as a means of gaining access and maintaining persistence within systems.
Organizations affected by this vulnerability should immediately implement mitigation strategies including mandatory client software updates to version 5.14.10 or later, which contain the necessary security patches to address the enforcement mechanism failures. Network administrators should also consider implementing additional monitoring and logging of Zoom client activities to detect potential exploitation attempts. The fix addresses the core issue by strengthening client-side validation of server-side security policies and ensuring that all security controls are properly enforced regardless of network conditions. Security teams should conduct comprehensive vulnerability assessments to identify systems running affected versions and implement proper access controls to limit the potential impact of any exploitation attempts. This vulnerability highlights the importance of maintaining proper separation between client-side and server-side security enforcement mechanisms, a principle that aligns with CWE-693 which addresses protection mechanism failures in security systems. The remediation process should include thorough testing of updated client configurations to ensure that all security controls function correctly and that no regressions have been introduced in the client application's behavior.