I noticed this advisory on Microsoft’s site this morning.

Microsoft is investigating new public reports of a vulnerability in the way Windows resolves hostnames that do not include a fully-qualified domain name (FQDN). The technology that the vulnerability affects is Web Proxy Auto-Discovery (WPAD). Microsoft has not received any information to indicate that this vulnerability has been publicly used to attack customers, and Microsoft is not aware of any customer impact at this time. Microsoft is aggressively investigating the public reports. Customers whose domain name begins in a third-level or deeper domain, such as “contoso.co.us”, or for whom the following mitigating factors do not apply, are at risk from this vulnerability.

Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.

Read on for workarounds.

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[tags]WPAD, Web Proxy Auto-Discovery, Microsoft Advisory 945713[/tags]

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