CVE-2019-1771 in WebEx Network Recording Player for Microsoft Windows
Summary
by MITRE
A vulnerability in the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerability exist because the affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file via 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.
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Analysis
by VulDB Data Team • 09/21/2023
The vulnerability identified as CVE-2019-1771 represents a critical remote code execution flaw within Cisco Webex Network Recording Player and Cisco Webex Player software for Microsoft Windows environments. This security weakness stems from inadequate input validation mechanisms within the affected applications when processing Advanced Recording Format and Webex Recording Format files. The vulnerability manifests due to the software's failure to properly sanitize and validate file structures before attempting to parse and render these multimedia recording formats, creating an exploitable condition that adversaries can leverage for unauthorized system access.
The technical exploitation of this vulnerability occurs through a sophisticated social engineering campaign where attackers craft malicious ARF or WRF files designed to trigger the code execution flaw upon user interaction. When a victim opens the specially crafted file using the vulnerable Webex player software, the malformed file structure bypasses normal validation checks and executes malicious code within the context of the user's session. This process aligns with attack patterns documented in the MITRE ATT&CK framework under the T1203 technique for legitimate user execution, where adversaries leverage trusted applications to execute malicious payloads. The vulnerability specifically maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-125, which addresses out-of-bounds read vulnerabilities that can lead to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple privilege escalation, as successful exploitation allows attackers to gain full control over affected systems without requiring additional authentication or specialized access. Attackers can leverage this vulnerability to install persistent backdoors, exfiltrate sensitive data, establish command and control channels, or use the compromised system as a launch point for further network infiltration. The widespread adoption of Webex software across enterprise environments significantly amplifies the potential impact, as organizations may have numerous vulnerable endpoints that could be targeted through mass email campaigns or compromised web links. Organizations utilizing these applications face elevated risk of advanced persistent threats and insider attack scenarios where malicious actors exploit the trust relationship between users and the legitimate software applications.
Mitigation strategies for CVE-2019-1771 should prioritize immediate software patching through Cisco's official security advisories and updates, as this represents the most effective defense against the vulnerability. Network administrators should implement strict file validation policies that prevent automatic execution of potentially malicious files, particularly those with ARF and WRF extensions, and establish sandboxing environments for file analysis. The implementation of email security filters that scan attachments for known malicious patterns and the deployment of endpoint detection and response solutions can provide additional layers of protection. Organizations should also conduct comprehensive vulnerability assessments to identify all systems running the affected software versions and establish user awareness training programs to reduce susceptibility to social engineering attacks. According to industry best practices outlined in NIST SP 800-40 and the CWE top 25 most dangerous software weaknesses, addressing such input validation vulnerabilities requires systematic code review processes and the implementation of secure coding practices that prevent buffer overflows and improper file handling scenarios.