Cisco Webex Network Recording Player Arbitrary Code Execution Vulnerabilities

Vulnerability

CVE-2019-1640 is a buffer overflow vulnerability in the Cisco Webex Network Recording Player and Cisco Webex Player for Microsoft Windows. The affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files [1]. Specifically, the vulnerability exists in the parsing of these file formats, allowing an attacker to craft a malicious file that triggers a buffer overflow when processed. The affected versions include Cisco Webex Network Recording Player and Cisco Webex Player prior to the fixes detailed in the advisory [1].

Exploitation

To exploit this vulnerability, an attacker must craft a malicious ARF or WRF file and deliver it to a target user, typically via a link or email attachment [1]. The attacker then needs to persuade the user to open the file with the affected Cisco Webex player software. No additional authentication or network position is required beyond user interaction — the attack is entirely client-side [1].

Impact

Successful exploitation could allow the attacker to execute arbitrary code on the affected system [1]. The attacker gains the ability to run commands or install programs with the privileges of the logged-in user, potentially leading to full compromise of the system, including data theft, installation of malware, or further lateral movement within a network [1].

Mitigation

Cisco has released free software updates to address CVE-2019-1640 [1]. Users should upgrade to the fixed versions specified in Cisco Security Advisory cisco-sa-20190123-webex-rce. There are no workarounds available that mitigate the vulnerability, and Cisco does not list this CVE on the Known Exploited Vulnerabilities (KEV) catalog [1].