The WebexUCFObject ActiveX control, which comes with Cisco WebEx Meeting Manager, contains a stack buffer overflow, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
Cisco WebEx is an online meeting and collaboration software package. WebEx Meeting Manager is the client-side application that is used by the WebEx meeting service. WebEx Meeting Manager includes an ActiveX control called WebexUCFObject, which is provided by the file atucfobj.dll. The WebexUCFObject ActiveX control contains a stack buffer overflow in the NewObject() method.
Limited testing has indicated that not every version of the WebexUCFObject ActiveX control is marked as Safe For Scripting, which means that some versions of the control may not be exploitable by using a default configuration of Internet Explorer. The Cisco Security Advisory indicates that WBS 23, WBS25, and WBS26 are vulnerable.
By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user.
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This vulnerability was publicly reported by Elazar Broad.
This document was written by Will Dormann.