MS07-053 is not categorized as virus, worm, Trojan or backdoor. It is an important vulnerability in several versions of Windows Services for UNIX, which allows local privilege escalation in the vulnerable computer.
The affected versions are: Subsystem for UNIX-based Applications, Windows Services for UNIX 3.5 and Windows Services for UNIX 3.0.
If exploited successfully, MS07-053 allows to gain unauthorized privileges on a computer or network. An example of privilege elevation would be an unprivileged user who could manage to be added to the Administrator's group. In such case, the hacker could take complete control of the system: create, modify or delete files, install programs, create new user accounts, etc.
This vulnerability is exploited by running specially crafted setuid binary files in the vulnerable computer. In order to do so, a hacker must be able to log on locally to the system.
If you have any of the vulnerable versions mentioned above, it is recommended to download and apply the security patch for this vulnerability. Click here to access the web page for downloading the patch.