A Vulnerability in Cisco WebEx Network Recording Player for Advanced Recording Format Files Could Allow for Arbitrary Code Execution

ITS Advisory Number: 
2018-051
Date(s) Issued: 
Wednesday, May 2, 2018
Subject: 
A Vulnerability in Cisco WebEx Network Recording Player for Advanced Recording Format Files Could Allow for Arbitrary Code Execution
Overview: 

A vulnerability in the Cisco WebEx Network Recording Player for Advanced Recording Format (ARF) files could allow an unauthenticated, remote attacker to execute arbitrary code on the system of a targeted user. The WebEx meeting service is a hosted multimedia conferencing solution that is managed and maintained by Cisco WebEx. The ARF player is an application that is used to play back and edit ARF recording files. Successful exploitation of this vulnerability could allow for arbitrary code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:
There are currently no reports of this vulnerability being actively exploited in the wild.

Systems Affected: 

• Cisco WebEx Business Suite (WBS31) client builds prior to T31.23.4
• Cisco WebEx Business Suite (WBS32) client builds prior to T32.12
• Cisco WebEx Meetings with client builds prior to T32.12
• Cisco WebEx Meeting Server builds prior to 3.0 Patch 1

RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
Low
Description: 

A vulnerability in the Cisco WebEx Network Recording Player for Advanced Recording Format (ARF) files could allow an unauthenticated, remote attacker to execute arbitrary code on the system of a targeted user. An attacker could exploit this vulnerability by sending the user a link or email attachment with a malicious ARF file and persuading the user to follow the link or open the file.

Successful exploitation could allow the attacker to execute arbitrary code on the user’s system. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

Actions: 

• After appropriate testing, immediately install updates provided by Cisco.
• Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
• Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
• Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
• Apply the Principle of Least Privilege to all systems and services.