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    Microsoft: Use MS Word in Safe Mode

    By
    Ryan Naraine
    -
    May 23, 2006
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      Use Microsoft Word in safe mode to protect against targeted zero-day attacks.

      Thats the advice from Microsofts security response team to counter known attacks against a serious code execution vulnerability in the widely used word processing program.

      In a pre-patch security advisory, Microsoft said the flaw can be exploited when a user opens a specially crafted Word file using a malformed object pointer.

      This corrupts system memory in such a way that an attacker could execute arbitrary code.

      The flaw can be exploited via the Web or via e-mail but, in both scenarios, an attacker would have to trick a user into opening the rigged Word file.

      In the absence of a patch, independent security researcher Matthew Murphy has released a registry script fix that sets a Software Restriction Policy that runs any instance of winword.exe with the Basic User policy.

      Because the current attack vector requires that the target is running the admin rights, the implementation of software restriction policies can reduce the effects the attack.

      Microsofts advisory also contains step-by-step instructions for running the vulnerable Word 2002 and Word 2003 in safe mode.

      The company is recommending that users first disable the Outlook feature to use Word as the default mail editor before changing settings to run Word in safe mode.

      “Safe mode disables the functionality and prevents vulnerable code from being exploited,” according to the advisory.

      /zimages/6/28571.gifClick here to read more about the early warnings about the MS Word zero-day attacks.

      Microsoft is also offering the following guidelines for Office documents in safe mode:

      • Do not open Word files that are embedded in other applications, such as Excel, PowerPoint and others.
      • Even after applying the workarounds, do not open Word files directly from any mail clients—for example, Outlook or Hotmail—by double-clicking them. Save your Word document to a disk or onto your desktop and use the “Word Safe Mode” Shortcut.
      • Do not open “.doc” files from a Web site via Internet Explorer or any other browser.
      • If you do not see “Safe Mode” in Word title bar, you are not running Word in safe mode. Do not attempt to open any Word files as you may be vulnerable to the malicious “.doc” files.
      • Use Word Viewer 2003 to open and view files. The free Word Viewer 2003 does not contain the vulnerable code and is not susceptible to this attack.

      In the attacks seen against select targets, two e-mail subject lines have been used. One is simply the word “Notice” and the other reads: “RE Plan for final agreement.”

      Two e-mail “.doc” attachments have been reported: “NO.060517.doc.doc,” and “PLANNINGREPORT5-16-2006.doc.”

      /zimages/6/28571.gifCheck out eWEEK.coms for the latest security news, reviews and analysis. And for insights on security coverage around the Web, take a look at eWEEK.com Security Center Editor Larry Seltzers Weblog.

      Ryan Naraine

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