MS05-013 is not categorized as virus, worm, Trojan or backdoor. It is a critical vulnerability in the DHTML (Dynamic HTML) Editing Component ActiveX control in Windows 2003/XP/2000/Me/98 computers, which allows to remotely execute arbitrary code in the vulnerable computer, or also information disclosure.
If exploited successfully, MS05-013 allows hackers to gain remote control of the affected computer with the same privileges as the logged on user. If this user had administrator rights, the hacker could take complete control of the system: create, modify or delete files, install programs, create new user accounts, etc. Additionally, the hacker would be able to access information from other visited websites, files in the computer, etc.
This vulnerability is exploited by creating a malicious web page and enticing users into accessing it. An e-mail message in HTML format could also be used.
If you have a Windows 2003/XP/2000/Me/98 computer, it is recommendable to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.