CVE-2018-15418 in WebEx Network Recording Player
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 an email attachment and persuading the user to open the file by using the affected software. A successful exploit could allow the attacker to execute arbitrary code on the affected system.
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Analysis
by VulDB Data Team • 05/22/2023
The vulnerability identified as CVE-2018-15418 represents a critical code execution flaw in Cisco Webex Network Recording Player and Cisco Webex Player software for Microsoft Windows environments. This security weakness stems from insufficient input validation mechanisms within the affected applications when processing Advanced Recording Format and Webex Recording Format files. The vulnerability falls under the category of improper input validation as classified by CWE-20, which is a fundamental weakness that allows malicious inputs to bypass security controls and potentially lead to system compromise. The flaw specifically affects the parsing logic of these media file formats, creating an attack surface where untrusted data can be manipulated to execute arbitrary commands within the context of the affected application.
The exploitation mechanism for this vulnerability relies on social engineering techniques combined with file-based attacks. Attackers can craft malicious ARF or WRF files that contain specially formatted payloads designed to trigger the code execution vulnerability when opened by the affected software. This approach leverages the trust relationship between the user and the application, as users typically expect to be able to open legitimate recording files without security concerns. The attack vector is particularly dangerous because it can be delivered through common communication channels such as email attachments or web links, making it accessible to threat actors with minimal technical expertise. The successful exploitation results in arbitrary code execution capabilities that can be leveraged to gain full control over the compromised system.
The operational impact of CVE-2018-15418 extends beyond simple privilege escalation as it provides attackers with complete system compromise potential. Once executed, the malicious code can perform various malicious activities including but not limited to data exfiltration, installation of additional malware, creation of backdoors, or establishing persistent access to the compromised environment. The vulnerability's presence in widely used collaboration software means that organizations with multiple users could face widespread compromise if a single user opens a malicious file. This scenario aligns with ATT&CK technique T1204.002 which describes the use of social engineering to gain system access through malicious file execution. The vulnerability's severity is amplified by the fact that it operates at the application level, potentially bypassing traditional network-based security controls that focus on network traffic inspection rather than endpoint file validation.
Organizations should implement immediate mitigation strategies to address this vulnerability including applying the official Cisco security patches released for the affected software versions. System administrators should also consider implementing email filtering rules to block suspicious file attachments and establish user awareness training programs to reduce the effectiveness of social engineering attacks. Network monitoring should be enhanced to detect unusual file access patterns and potential exploitation attempts. The vulnerability's classification as a remote code execution flaw makes it particularly attractive to threat actors, as demonstrated by various threat intelligence reports showing its use in targeted attacks. Security teams should also consider implementing application whitelisting policies that restrict execution of unauthorized software and file types to prevent exploitation of similar input validation vulnerabilities in other applications.