A 3rd zero-day vulnerability in Microsoft Word in a week

Application: Word for Windows and Mac Word 2000 Word XP Word 2003 Word Viewer 2003 Word v.X for Mac (reported but unverified) Description:A new zero-day vulnerability has been publicly released. Because details are at a minimum for the other two active zero-day vulnerabilities originally reported by Microsoft, it is presumed that this disclosed vulnerability is […]

Application: Word for Windows and Mac

  • Word 2000
  • Word XP
  • Word 2003
  • Word Viewer 2003
  • Word v.X for Mac (reported but unverified)

Description:
A new zero-day vulnerability has been publicly released. Because details are at a minimum for the other two active zero-day vulnerabilities originally reported by Microsoft, it is presumed that this disclosed vulnerability is actually a third and separate vulnerability.

Technical Details:
(The following offsets are based on WordView.exe version 11.0.8026.0.)
The field at offset 0x274 in 12122006-djtest.doc (0x23000000) is passed into sub_304536D3 as its 5th argument by sub_301A36CD. This number is reduced at 30453712 by a value so far only observed to be 1, then eventually multiplied by 4 at 30193FD6, resulting in the observed 0x8BFFFFFC value which is then added to a pointer at 3019400B to produce the destination passed to memmove. Although the destination pointer produced by 12122006-djtest.doc causes a crash, the field mentioned above could be controlled to target any location, relative to the address at which the data "AAAA" (from offset 0x27E4 in the file) is loaded into memory.
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A 3rd zero-day vulnerability in Microsoft Word in a week