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Multiple Vulnerabilities in Cisco WebEx Recording Format and Advanced Recording Format Players Could Allow for Arbitrary Code Execution

MS-ISAC ADVISORY NUMBER:

2017-117

DATE(S) ISSUED:

11/30/2017

OVERVIEW:

Multiple vulnerabilities has been discovered in the Cisco WebEx Network Recording Player for Advanced Recording Format (ARF) and WebEx Recording Format (WRF) Players, the most severe of which could allow for arbitrary code execution. The WebEx meeting service is a hosted multimedia conferencing solution that is managed and maintained by Cisco WebEx. The ARF and WRF Players are applications that are used to play back and edit ARF and WRF recording files. Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution.

THREAT INTELLIGENCE:

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

SYSTEMS AFFECTED:

  • Cisco WebEx Business Suite (WBS30) client builds prior to T30.20
  • Cisco WebEx Business Suite (WBS31) client builds prior to T31.14.1
  • Cisco WebEx Business Suite (WBS32) client builds prior to T32.2
  • Cisco WebEx Meetings with client builds prior to T31.14
  • Cisco WebEx Meeting Server builds prior to 2.7MR3

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: HIGH
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: HIGH
Home Users:
LOW

TECHNICAL SUMMARY:

Multiple vulnerabilities has been discovered in the Cisco ARF and WRF Players, the most severe of which could allow for arbitrary code execution. An attacker who can convince an affected user to visit an attacker-controlled web page or launch an attacker-supplied link with a malicious ARF or WRF file could exploit the vulnerability. If successful, the attacker could execute arbitrary code with the privileges of the affected browser. Successful exploitation of this vulnerability could result in the attacker gaining control of the affected system. (CVE-2017-12367, CVE-2017-12368, CVE-2017-12369, CVE-2017-12370, CVE-2017-12371, CVE-2017-12372, CVE-2017-12359)

RECOMENDATIONS:

We recommend the following actions be taken:

  • Install the update provided by Cisco immediately after appropriate testing.
  • 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 websites or follow links provided by unknown or untrusted 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.

REFERENCES:

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