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    Home Cybersecurity
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    Microsoft Urges Organizations to Patch Server Vulnerability as New Attacks Surface

    By
    Brian Prince
    -
    January 2, 2009
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      Microsoft advised organizations yet again to deploy the patch for a flaw affecting the Windows Server service that was fixed in October.

      The latest attacks are coming courtesy of a new variant of the Conficker worm, identified by Microsoft as Win32/Conficker.B. According to the company, the variant is hitting machines that have not applied the fix, while also spreading via network shares by attempting to log in to machines using a list of weak passwords.

      The worm exploits a vulnerability caused by the Server service failing to properly handle specifically crafted RPC (remote procedure call) requests. If an exploit is successful, it could allow an attacker to execute code remotely when file sharing is enabled.

      The issue was the subject of a rare out-of-band security patch by Microsoft on Oct. 23. As attacks mounted, Microsoft issued a follow-up advisory on its Security Response Center blog a month later.

      “We encourage all customers to apply our most recent security updates to help ensure that their computers are protected from attempted criminal attacks,” a Microsoft spokesperson said.

      The Windows firewall also provides a defense against attacks in a default setting because as it blocks hackers from reaching the RPC interface.

      The flaw affects users of Microsoft Windows 2000, Windows XP and Windows Vista, as well as Windows Server 2003 and Server 2008. On Windows 2000, XP and Server 2003, any anonymous user with access to the target network can deliver a specially crafted network packet to exploit the vulnerability. However, on Vista and Server 2008 systems, only an authenticated user with access to the target network can deliver the packet.

      “By default, Microsoft Windows XP, Windows Vista, Windows Server 2003 and Windows Server 2008 customers will have this update applied automatically through Automatic Updates,” the spokesperson said. “We encourage all customers to apply our most recent security updates to help ensure that their computers are protected from attempted criminal attacks.”

      Brian Prince

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