Thorsten Delbrouck has reported a vulnerability in Microsoft Word, which can be exploited by malicious people to manipulate protected documents.
Microsoft Word includes a "form" password protection mechanism to prevent manipulation of documents. However, it is possible to bypass this mechanism by clearing the password checksum in the document (setting it to "0x00000000" with a hex editor).
The original password checksum to search for can be found by saving a protected document as a ".html" file and then looking at the value in the "<w:UnprotectPassword>" tag.
Solution: Don't rely on this feature to protect documents from malicious tampering.
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Subject: Microsoft Word Form Protection Bypass Vulnerability
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