The British Telecommunications Consumer webhelper ActiveX control contains multiple buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
The registration process for British Telecommunications (BT) internet services uses an ActiveX control called webhelper. This ActiveX control is provided by the file btwebcontrol.dll. The BT Consumer webhelper ActiveX control contains multiple buffer overflow vulnerabilities.
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. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.
This issue is addressed in version 22.214.171.124 of the Consumer webhelper ActiveX control. However, customers who have already gone through the registration process will not likely get the updated control. Therefore, please consider the following workarounds
Disable the BT Consumer webhelper ActiveX control in Internet Explorer
This vulnerability was reported by Will Dormann of CERT/CC.
This document was written by Will Dormann.
|Date First Published:||2007-05-29|
|Date Last Updated:||2007-05-30 17:37 UTC|