CVE-2018-0380

Vulnerability

Multiple vulnerabilities exist in the Cisco Webex Network Recording Player for Advanced Recording Format (.arf) files and the Webex Player for Webex Recording Format (.wrf) files [1]. These flaws are triggered when the player parses specially crafted .arf or .wrf files. Affected versions include the players distributed via Cisco Webex Meetings Suite, Webex Meetings Online, and Webex Meetings Server [1]. Exact version details are available from the referenced Cisco bug IDs (e.g., CSCvh70253) [1]. The ARF player can be automatically installed when a user accesses a recording, while the WRF player is downloaded manually [1].

Exploitation

An attacker can exploit these vulnerabilities by providing a user with a malicious .arf or .wrf file, for example via email or by hosting it on a URL, and convincing the user to open the file in the corresponding Webex recording player [1]. No authentication or special network access is required beyond the ability to deliver the file and induce the user to launch it [1]. The exploitation sequence relies on social engineering: the user double-clicks the file, triggering the vulnerable parsing code.

Impact

Successful exploitation causes the Webex player to crash, resulting in a denial of service (DoS) condition [1]. The attacker does not gain code execution or data access; the impact is limited to application termination, requiring the user to restart the player [1]. The DoS can be repeated each time the user opens the malicious file.

Mitigation

Cisco has released software updates to address these vulnerabilities, as documented in the security advisory [1]. Users should update their Webex Network Recording Player or Webex Player to the latest version provided by Cisco. As a workaround, users should exercise caution when opening .arf or .wrf files from untrusted sources and avoid clicking links or attachments from unknown senders [1]. For systems that have reached end of software maintenance, customers should contact Cisco support [1].