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Tavis Ormandy, Google security researcher, discovered a vulnerability in Windows Help, which is the default application for accessing online documentation for Microsoft Windows.
Microsoft supports direct access to help documents via URLs by installing a protocol manager for the hcp schema, a typical example is included in the Windows XP command line reference and all details are documented here.
This issue was reported to Microsoft on June 5, 2010. Less than four days later, on June 9, 2010, he made it public.
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Disclosure of the details of this vulnerability and how to exploit it without giving Microsoft time to solve the problem now makes attacks more likely and endangers Windows XP users !(2)
Windows Vista, Windows 7, Windows Server 2008 and Windows Server 2008 R2 users are not vulnerable or at risk for this problem.
One of the main reasons why we and many others in the industry advocate responsible disclosure is that the software vendor who wrote the code is best able to understand the root cause. Although this was a good discovery by the Google researcher, it turns out that the analysis is incomplete and that the workaround suggested by Google can be easily bypassed. In some cases, it takes longer for a complete update that can not be avoided and does not cause quality problems, says Microsoft.
It is regrettable, even irresponsible, that the security researcher decided to make public without giving Microsoft time to correct this vulnerability.
customers can follow the instructions in Safety Advisory 2219475 to protect themselves from this problem.
UPDATE : Microsoft has released a FixIt to fix this problem.
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