MS07-056 is not categorized as virus, worm, Trojan or backdoor. It is a critical vulnerability in Outlook Express and Windows Mail, which allows arbitrary code to be remotely executed in the vulnerable computer.
The affected versions are:
- Outlook Express 5.5 on Windows 2000 computers.
- Outlook Express 6 on Windows 2003/XP/2000 computers.
- Windows Mail in Windows Vista.
If exploited successfully, MS07-056 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.
This vulnerability is usually exploited by creating a specially crafted web page and enticing users into accessing it. The link to the website can be distributed using several methods, such as email, instant messaging programs, etc.
If you have any of the vulnerable versions of Outlook Express or Windows Mail installed your computer, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch. However, provided that this is a cumulative patch, make sure that you download the latest security patch available.