CVE-2018-15431 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-2018-15431 represents a critical security flaw in Cisco Webex Network Recording Player and Cisco Webex Player software for Microsoft Windows platforms. This issue stems from improper validation mechanisms within the affected software's handling of Advanced Recording Format and Webex Recording Format files, creating a significant attack surface that could be exploited by malicious actors. The vulnerability specifically targets the file parsing and processing capabilities of these media players, which are commonly used for viewing recorded web conferences and meetings. The flaw exists in the software's input validation routines that fail to properly sanitize and verify the structure and content of ARF and WRF files before processing them, allowing attackers to craft malicious files that can bypass normal security checks.
The technical exploitation of this vulnerability occurs through a classic social engineering attack vector where an attacker crafts specially malformed ARF or WRF files designed to trigger buffer overflow conditions or code execution vulnerabilities within the affected software. When a victim opens such a malicious file using the vulnerable Webex player, the software's inadequate validation routines process the malformed data without proper bounds checking or content sanitization, leading to arbitrary code execution on the target system. This type of vulnerability falls under the CWE-121 category of buffer overflow conditions, specifically involving stack-based buffer overflows that occur when the software attempts to write data beyond the allocated memory boundaries. The attack requires minimal user interaction beyond opening the malicious file, making it particularly dangerous as it can be delivered through email attachments or web links that appear legitimate to unsuspecting users.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a potential foothold for further system compromise and lateral movement within network environments. Successful exploitation could enable attackers to install malware, establish backdoors, or gain unauthorized access to sensitive information stored on the compromised system. The vulnerability affects organizations that rely on Cisco Webex for collaborative meetings and training sessions, potentially exposing corporate networks to persistent threats. Attackers could leverage this vulnerability to conduct reconnaissance, escalate privileges, or use the compromised system as a launching point for attacks against other network resources. The security implications are particularly severe in enterprise environments where Webex players are widely deployed for internal communications and training purposes, as a single compromised endpoint could provide attackers with access to sensitive business information and operational data.
Organizations should implement immediate mitigations including disabling automatic playback of potentially malicious files, updating to patched versions of Cisco Webex software, and implementing network-based controls to block access to suspicious file types. The vulnerability demonstrates the importance of proper input validation and secure coding practices, aligning with ATT&CK technique T1059 for command and script injection. Security teams should deploy endpoint detection and response solutions to monitor for suspicious file execution patterns and consider implementing application whitelisting policies to prevent unauthorized software execution. Regular security awareness training for employees is essential to reduce the risk of successful social engineering attacks that exploit this vulnerability. Cisco has released patches addressing this issue, and organizations should prioritize updating their Webex player installations to prevent exploitation. The vulnerability also highlights the need for comprehensive security testing of media processing applications and adherence to secure coding standards that prevent buffer overflow conditions and other memory corruption vulnerabilities.