Hackers have released code that could be used to take control of a server running Microsoft's Host Integration Server 2006, used to connect mainframe applications to Windows PCs. The software was released Wednesday as part of the Metasploit hacking toolkit.

Microsoft released a patch for this flaw on Tuesday, as part of its monthly security updates. The bug lies in the SNA (Systems Network Architecture) remote procedure call used by the server to communicate with the mainframe.

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