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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Dan Blank‏ @init99 26 Feb 2017
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      Replying to @MalwareJake

      @marcan42 I wouldn’t necessarily say can’t. Also that’s only 1 other file type- PK

      1 reply 0 retweets 0 likes
    2. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @init99 @marcan42

      Oh, I understand it's only one other filetype. But many news reports do not. And I doubt it will be done any time soon.

      1 reply 0 retweets 0 likes
    3. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @MalwareJake @init99 @marcan42

      The problem with PK is getting the compressed data collision and still have the decompressed data make sense.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 26 Feb 2017
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      Replying to @MalwareJake @init99

      PK has plenty of uncompressed headers to play around with, plus the data itself can be uncompressed.

      1 reply 0 retweets 0 likes
    5. Jake Williams‏ @MalwareJake 26 Feb 2017
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      Replying to @marcan42 @init99

      I understand the format, but does the MS Office standard support he full range of PK options?

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 26 Feb 2017
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      Replying to @MalwareJake @init99

      I would be rather surprised if it didn't support things like uncompressed mode and comments (if only to ignore them)

      1 reply 0 retweets 0 likes
    7. Dan Blank‏ @init99 27 Feb 2017
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      Replying to @marcan42 @MalwareJake

      good point re news. I’d guess @marcan42 is right on the uncomp blocks. Can test in May when the Shattered PoC is out

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 27 Feb 2017
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      Replying to @init99 @MalwareJake

      Shattered PoC isn't going to help you here unless you have $100k to burn on Amazon. PDF-wise we already know the story.

      1 reply 0 retweets 0 likes
    9. Hector Martin‏ @marcan42 27 Feb 2017
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      Replying to @marcan42 @init99 @MalwareJake

      But you can try to construct a pseudo-collision template for PK/OOXML now if you want (just add $100k to make it real)

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 27 Feb 2017
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      Replying to @marcan42 @init99 @MalwareJake

      It's not completely trivial though, e.g. there are data CRCs and you can't collide CRCs (math works against you here)

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 27 Feb 2017
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      Replying to @marcan42 @init99 @MalwareJake

      (if the CRC32s of the collision blocks don't match then no arbitrary identical data appended will make them match)

      9:48 AM - 27 Feb 2017
      1 reply 0 retweets 0 likes
        1. Hector Martin‏ @marcan42 27 Feb 2017
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          Replying to @marcan42 @init99 @MalwareJake

          But I think it's quite likely that you can pull some tricks with PK metadata, not just payload data.

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