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Microsoft releases advisory and workarounds for IE 7 XML flaw

Microsoft has released a security advisory with a suggested workaround for protecting vulnerable machines against attacks on the unpatched XML vulnerability in Internet Explorer 7 that came to light earlier this week. The advisory suggests that customers at risk from the attacks do several things: enable DEP, set the Internet and intranet security settings to high, and configure IE to prompt the user before running active scripting, or disable active scripting altogether in the Internet and local intranet security zones.

Microsoft said it’s seen limited attacks against the vulnerability, and there are numerous reports or working exploits being seen in use. In its advisory, Microsoft confirmed that IE 7 on Vista and Windows Server 2008 is vulnerable to this attack, as are machines running XP SP2 and SP3 and Windows Server 2003. However, the company also said that running IE in protected mode mitigates the vulnerability. Microsoft did not rule out the possibility of issuing an out-of-band patch for the flaw.

We are actively investigating the vulnerability these attacks attempt to exploit. We will continue to monitor the threat environment and update this advisory if this situation changes. On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through a service pack, our monthly security update release process, or an out-of-cycle security update, depending on customer needs.

If the attacks continue to build, Microsoft may issue an emergency fix, given they just released their patches for December and it will be nearly a month before the next set of regular fixes are released.

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