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4. Windows Certificate Enrollment Control Vulnerability Patch (Windows XP) Download

Fix a Windows flaw to stop a Web site or HTML e-mail from deleting digital certificates on your computer.

Windows Certificate Enrollment Control Vulnerability Patch (Windows XP) Editor's review

All versions of Windows ship with an ActiveX control known as the Certificate Enrollment Control, the purpose of which is to allow Web-based certificate enrollments. The control contains a flaw that could enable a Web page, through an extremely complex process, to invoke the control in a way that would delete certificates on a user?s system. An attacker who successfully exploited the vulnerability could corrupt trusted root certificates, EFS encryption certificates, e-mail signing certificates, and any other certificates on the system, thereby preventing the user from using these features.

A new version of the control is available that corrects the vulnerability and can be installed via the patch. As discussed in the Caveats section, customers who operate Web sites that use the Certificate Enrollment Control will need to make minor revisions to their Web applications in order to use the new control. Microsoft Knowledge Base article Q323172 details how to do this. In addition, the patch addresses a similar, but less serious vulnerability discovered in the SmartCard Enrollment control. This control ships with Windows 2000 and Windows XP. A new version of this control is also provided.

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