Server Message Block (SMB) is used by Windows to share files and print documents over a network.
In a blog posting, Microsoft acknowledged that Metasploit tools were already available on the internet to exploit the SMB flaw.
Metasploit is an open-source toolkit which hackers and penetration testers use to build attack code. According to Metasploit, the flaw Microsoft patched goes back to March 2001, when a hacker published code showing how the attack was done.
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