CVE-2020-3573 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-2020-3573 affects Cisco Webex Network Recording Player and Cisco Webex Player software for Windows operating systems, representing a critical security flaw that enables remote code execution. This vulnerability stems from inadequate validation mechanisms within the affected software when processing Webex recording files stored in Advanced Recording Format (ARF) or Webex Recording Format (WRF). The flaw creates a pathway for attackers to compromise systems through social engineering tactics that诱导 users to open maliciously crafted recording files. The affected software fails to properly sanitize input from these specific file formats, allowing malicious code embedded within the recording metadata or content to be executed when the file is opened by an unsuspecting user. This represents a classic attack vector where user interaction is required, making it particularly dangerous in enterprise environments where users may not be adequately trained to recognize phishing attempts or malicious attachments.
The technical exploitation of this vulnerability occurs through the manipulation of ARF or WRF file structures, which are designed to store multimedia recordings along with associated metadata and control information. When the vulnerable software processes these files, it does not adequately validate the integrity and safety of the embedded elements, allowing attackers to inject malicious code that executes with the privileges of the currently logged-in user. This privilege escalation aspect is particularly concerning as it can potentially lead to full system compromise if the targeted user has administrative rights. The vulnerability aligns with CWE-129, which addresses insufficient input validation, and demonstrates how improper handling of external data sources can create dangerous execution paths. Attackers can craft malicious files that appear legitimate to users but contain hidden code that exploits the validation gaps in the Webex player software. The attack requires minimal technical sophistication from the attacker while potentially delivering maximum impact to the victim's system.
From an operational perspective, this vulnerability poses significant risks to organizations that rely on Webex for collaboration and communication, particularly in environments where users frequently open email attachments or click on links from external sources. The attack surface is broad as it leverages common user behaviors such as opening email attachments or following links that lead to malicious files. The exploitation process does not require specialized tools or deep technical knowledge, making it accessible to threat actors across the spectrum. Security teams must consider that users may inadvertently trigger this vulnerability through legitimate business activities such as receiving meeting recordings from colleagues or accessing shared files. The impact extends beyond individual system compromise to potential lateral movement within networks, especially if the compromised user has access to sensitive systems or data. Organizations that have not updated their Webex software versions or implemented additional security controls face heightened risk of successful exploitation.
Mitigation strategies for CVE-2020-3573 should prioritize immediate software updates from Cisco, as the vendor has released patches addressing the validation issues in affected versions. Organizations should implement email filtering solutions that can identify and quarantine suspicious attachments, particularly those with ARF or WRF file extensions. Network segmentation and privilege reduction measures can limit the potential impact if exploitation occurs, ensuring that even if a user's system is compromised, attackers cannot easily escalate privileges or move laterally. Security awareness training programs should emphasize the dangers of opening unexpected attachments and clicking on suspicious links, as these are the primary methods attackers use to deliver malicious payloads. Additionally, implementing application whitelisting policies that restrict execution of untrusted software can provide an additional layer of protection. The vulnerability demonstrates the importance of maintaining up-to-date software and following security best practices as outlined in the ATT&CK framework, specifically addressing techniques related to execution through malicious files and social engineering attacks. Organizations should also consider monitoring for suspicious file access patterns and implementing automated security controls that can detect and prevent exploitation attempts.