CVE-2020-3463 in Webex Meeting
Summary
by MITRE
A vulnerability in the web-based management interface of Cisco Webex Meetings could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of the affected service. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of the affected service. An attacker could exploit this vulnerability by persuading a user to click a malicious link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
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Analysis
by VulDB Data Team • 11/10/2020
The vulnerability identified as CVE-2020-3463 represents a critical cross-site scripting flaw within Cisco Webex Meetings' web-based management interface, demonstrating a fundamental weakness in input validation mechanisms that directly impacts the security posture of enterprise communication platforms. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as a reflected XSS attack vector that exploits insufficient sanitization of user-supplied data within the web application's input processing pipeline.
The technical exploitation of this vulnerability occurs through the manipulation of the web interface's input handling mechanisms, where the application fails to properly validate and sanitize all user-provided data before incorporating it into dynamic web page content. Attackers can craft malicious links containing crafted script payloads that, when clicked by an authenticated user within the management interface, execute within the context of the victim's browser session. This creates a persistent threat vector that can be leveraged for session hijacking, credential theft, or further escalation within the compromised environment.
The operational impact of CVE-2020-3463 extends beyond simple script execution, as it provides attackers with the capability to access sensitive browser-based information and potentially execute arbitrary code within the user's session context. This vulnerability particularly affects organizations relying on Cisco Webex Meetings for enterprise collaboration, where the management interface typically requires elevated privileges and contains sensitive configuration data. The unauthenticated nature of the attack means that even users without prior access credentials can potentially exploit this vulnerability, making it especially dangerous in environments where users might be tricked into clicking malicious links through social engineering campaigns.
The exploitation chain for this vulnerability follows established ATT&CK framework patterns, specifically mapping to techniques such as T1566 for social engineering and T1059 for command and script injection. The attack requires minimal privileges from the attacker's perspective, as the vulnerability exists within the web interface itself rather than requiring system-level access or authentication. Organizations should consider implementing comprehensive input validation controls, including HTML escaping, Content Security Policy enforcement, and regular security assessments of web applications to prevent similar vulnerabilities from emerging in their infrastructure. The vulnerability highlights the critical importance of robust input sanitization practices in web applications and the necessity of adhering to secure coding standards to prevent such persistent threats in enterprise collaboration platforms.
This vulnerability represents a significant risk to organizations using Cisco Webex Meetings, as it enables attackers to potentially gain unauthorized access to sensitive management functions and compromise the integrity of enterprise communication systems. The combination of the web-based interface exposure and the lack of proper input validation creates a dangerous attack surface that can be exploited through simple phishing campaigns or malicious link distribution, making it essential for organizations to implement immediate mitigations and monitor for exploitation attempts.