Blaster worm wreaking havoc
The security hole that the Blaster Worm exploits was publicized as one of the first major holes in Microsoft's Windows 2003 operating system. This same security hole also exists on Windows XP, Windows 2000, and Windows NT 4.0.
Once a machine is infected by the Blaster worm (also referred to as the "Lovesan", "MSBlaster", and "Poza" ) it begins to infect other machines and also begins an attack on Microsoft's Windows Update site - Microsoft's primary distribution point for Windows operating system updates and security fixes.
This worm has the potential to spread as quickly as Code Red or Slammer, the security exploit which the worm uses to replicate gives the attacker operating system level access to the infected computer. This basically gives the attacker permission to read, write and delete files, install or remove programs, and make configuration changes on the infected systems.
If you are using one of the affected versions of Windows, it is *highly* recommended to make sure that your anti-virus software is up to date and that you have applied the Microsoft security patch that addresses this specific problem.