The VeriSign Configuration Checker ActiveX control contains a stack buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
The VeriSign Configuration Checker ActiveX control is provided by web-based digital certificate enrollment sites and also by the VeriSign Managed PKI OnSiteMSI package. This control is vulnerable to a stack buffer overflow in the VerCompare() method, which can allow an overwrite of the process Structured Exception Handler (SEH).
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.
Apply an update
VeriSign Japan has published a page to check if the vulnerable ActiveX control is installed. If the vulnerable control is found, a download link to an update is provided. This update removes the VSCnfChk.dll file, which provides the vulnerable ActiveX control. Please note that this update will not prevent the vulnerable control from being installed again in the future. Therefore, we recommend the following workarounds:
This vulnerability was reported by VeriSign Japan.
This document was written by Will Dormann and Chris Taschner.
|Date First Published:||2007-02-22|
|Date Last Updated:||2007-03-26 14:10 UTC|