Rewterz Threat Advisory – CVE-2017-3823 Cisco WebEx Browser Extension Remote Code Execution Vulnerability

Severity

High

Analysis Summary

A vulnerability in Cisco WebEx browser extensions could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the affected browser on an affected system.

The vulnerability is due to a design defect in an application programming interface (API) response parser within the plugin. An attacker that can convince an affected user to visit an attacker-controlled web page or follow an attacker-supplied link with an affected browser could exploit the vulnerability.  If successful, the attacker could execute arbitrary code with the privileges of the affected browser.

Impact

Execution of arbitrary code

Affected Vendors

Cisco

Affected Products

• Cisco WebEx extensions and plugins for Windows
• Versions prior to 1.0.7 of the Cisco WebEx Extension on Google Chrome
• Versions prior to 106 of the ActiveTouch General Plugin Container on Mozilla Firefox
• Versions prior to the first fixed version of the GpcContainer Class ActiveX control plugin on Internet Explorer

Remediation

Vendor has released updates for Google Chrome, Firefox and internet explorer that address this vulnerability.