CVE-2020-3603 in WebEx Network Recording Player
Summary
by MITRE • 11/07/2020
Multiple vulnerabilities in Cisco Webex Network Recording Player for Windows and Cisco Webex Player for Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerabilities are due to insufficient validation of certain elements of a Webex recording that is stored in the Advanced Recording Format (ARF) or Webex Recording Format (WRF). An attacker could exploit these vulnerabilities by sending a user a malicious ARF or WRF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the targeted user.
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Analysis
by VulDB Data Team • 12/03/2020
The vulnerability identified as CVE-2020-3603 affects Cisco Webex Network Recording Player and Cisco Webex Player applications for Windows operating systems, representing a critical security flaw that could enable remote code execution attacks. These applications are designed to handle multimedia recordings in Advanced Recording Format (ARF) and Webex Recording Format (WRF) file types, which are commonly used for storing and sharing video conference recordings. The vulnerability stems from inadequate input validation mechanisms within the software's parsing routines for these specific file formats, creating a pathway for malicious actors to compromise affected systems through social engineering attacks.
The technical flaw manifests in the insufficient validation of elements within ARF and WRF files, where the affected software fails to properly sanitize or verify the structure and content of these recording files before processing them. This weakness allows attackers to craft specially malformed files that contain malicious code or exploit sequences designed to trigger buffer overflows, memory corruption, or other execution-based vulnerabilities within the application's processing pipeline. The vulnerability is classified under CWE-20, which represents "Improper Input Validation," and aligns with ATT&CK technique T1203, "Exploitation for Client Execution," where adversaries leverage client-side applications to execute malicious code.
The operational impact of this vulnerability is severe as it enables attackers to execute arbitrary code on targeted systems with the privileges of the currently logged-in user, potentially leading to complete system compromise. Attackers can exploit this vulnerability through social engineering campaigns that deliver malicious ARF or WRF files via email attachments or malicious links, requiring only user interaction to initiate the exploit. Once successfully exploited, the compromised system could serve as a foothold for further lateral movement within networks, data exfiltration, or deployment of additional malware. The attack vector is particularly concerning because it relies on user behavior rather than system-level vulnerabilities, making it difficult to defend against through traditional network security measures alone.
Organizations should implement immediate mitigations including disabling automatic execution of potentially malicious files, implementing strict email filtering policies to block suspicious attachments, and ensuring users are trained to recognize social engineering attempts. Cisco has released patches and updates to address this vulnerability, which should be deployed immediately across all affected systems. Additionally, network segmentation and monitoring should be enhanced to detect unusual file access patterns or attempts to execute unknown binaries. The vulnerability highlights the importance of validating all external input data and implementing defense-in-depth strategies that protect against both network-level and endpoint-level attacks, particularly when dealing with multimedia applications that process potentially untrusted content.