CVE-2020-3361 in Webex Meetings
Summary
by MITRE
A vulnerability in Cisco Webex Meetings and Cisco Webex Meetings Server could allow an unauthenticated, remote attacker to gain unauthorized access to a vulnerable Webex site. The vulnerability is due to improper handling of authentication tokens by a vulnerable Webex site. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Cisco Webex Meetings Server site. If successful, the attacker could gain the privileges of another user within the affected Webex site.
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Analysis
by VulDB Data Team • 10/25/2020
The vulnerability identified as CVE-2020-3361 represents a critical authentication flaw in Cisco Webex Meetings and Cisco Webex Meetings Server platforms that exposes organizations to unauthorized remote access threats. This weakness stems from inadequate validation and handling of authentication tokens within the webex infrastructure, creating a pathway for malicious actors to impersonate legitimate users. The vulnerability affects organizations that rely on Cisco Webex for video conferencing and collaboration services, potentially compromising sensitive meeting data and user privileges across enterprise networks. Security researchers have classified this issue as a significant risk due to its remote exploitability and the potential for privilege escalation within the affected systems.
The technical root cause of this vulnerability lies in the improper validation of authentication tokens within the Webex platform's session management mechanism. When users authenticate to the Webex service, the system generates authentication tokens that should be properly validated and managed throughout the session lifecycle. However, the flaw allows attackers to manipulate or forge these tokens through crafted HTTP requests, bypassing the normal authentication process entirely. This improper token handling creates a condition where an unauthenticated attacker can submit malicious requests that appear to originate from legitimate authenticated users, effectively allowing them to assume the identity and privileges of other users within the same Webex site. The vulnerability demonstrates weaknesses in the token-based authentication model and highlights inadequate input validation mechanisms within the Webex server-side processing.
The operational impact of CVE-2020-3361 extends beyond simple unauthorized access to encompass potential data breaches, privilege escalation, and service disruption within affected organizations. Attackers exploiting this vulnerability could gain access to confidential meeting recordings, participant lists, and sensitive business communications that are typically restricted to authorized users. The ability to impersonate other users means that an attacker could potentially access restricted features, modify meeting configurations, or even conduct malicious activities under the guise of legitimate employees. This vulnerability particularly threatens organizations that use Webex for executive meetings, financial discussions, or other sensitive business operations where unauthorized access could result in significant financial or reputational damage. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the internet without requiring physical access or prior credentials.
Organizations affected by this vulnerability should implement immediate mitigations including applying Cisco's security patches and updates as released through their official security advisories. Network administrators should consider implementing additional access controls and monitoring mechanisms to detect unusual authentication patterns or suspicious request behaviors. The vulnerability aligns with CWE-287 which addresses improper authentication issues, and represents a specific implementation flaw that could be categorized under ATT&CK technique T1078 for valid accounts and T1566 for credential harvesting. Security teams should also consider deploying web application firewalls and implementing strict access controls to limit exposure to external threats. Regular security assessments and monitoring of authentication logs should be conducted to identify potential exploitation attempts, while user education regarding suspicious meeting invitations or unexpected access patterns remains crucial for comprehensive defense against this and similar authentication-related vulnerabilities.