MS07-040 is not categorized as virus, worm, Trojan or backdoor. It is a group of critical vulnerabilities in several versions .NET Framework on Windows Vista/2003/XP/2000 computers, which allows arbitrary code to be remotely executed in the vulnerable computer or information to be disclosed. The affected versions of .NET Framework are: 1.0, 1.1 and 2.0.
The addressed vulnerabilities are:
- .NET PE Loader vulnerability: a remote code execution vulnerability.
- ASP.NET Null Byte Termination vulnerability: an information disclosure vulnerability.
It could allow an attacker to bypass the security features of an ASP.NET website to download the contents of any web page.
- .NET JIT Compiler vulnerability: a remote code execution vulnerability.
If exploited successfully, MS07-040 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.
These vulnerabilities are usually exploited by creating a specially crafted web page or URL 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 affected components installed on Windows Vista/2003/XP/2000 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.