A vulnerability has been identified in the handling of TCP packets in Microsoft Windows 2000 and Windows XP, which potentially can expose sensitive information.

The problem is that Windows under some circumstances doesn't clear the "URG" flag of TCP packets. When this happens Windows will not set the correct value for the 16 bit "URG" pointer value but may instead include random data from other data transfers.

This behaviour has been reported to affect Windows 2000 and XP with all the latest patches and updates. There is no report that this behaviour can be exploited unless data transfers are occuring at the same time.

This issue has been rated as "Not critical" since only a small amount of data may be revealed and because the issue can't be triggered by malicious people.

Solution
There's no effective solution available.
Further details available to Secunia VIM customers

Provided and/or discovered by
Michal Zalewski

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