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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Will Dormann‏ @wdormann 21 Jul 2018
      • Report Tweet
      • Report NetzDG Violation

      Will Dormann Retweeted Davy Douhine

      This exploit is quite reliable on Windows! Unless you have Windows Defender Exploit Guard specifically enabling additional protections beyond the standard DEP + ASLR for vlc.exe, you're in trouble if you're on VLC 2.x. UAF + heap spray means only DEP and ASLR isn't good enough.https://twitter.com/ddouhine/status/1019898366996680705 …

      Will Dormann added,

      Davy Douhine @ddouhine
      Update VLC ! Incoming #metasploit exploit targeting a UAF in VideoLAN VLC media player <= 2.2.8 ! CVE-2018-11529 discovered and exploited by Eugene Ng and module coded by Winston Ho. I guess sharing this on Torrent will pop a few shells ;) https://github.com/rapid7/metasploit-framework/pull/10335 … pic.twitter.com/p61iqjFdJF
      1 reply 30 retweets 65 likes
      Show this thread
      Will Dormann‏ @wdormann 23 Jul 2018
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      Wait a minute here... despite VLC apparently being compiled with ASLR compatiblity, it's being loaded at 0x00400000 every single time. Can anybody share any insight as to what's going on here?pic.twitter.com/0Qlycj9XS0

      11:00 AM - 23 Jul 2018
      • 5 Retweets
      • 5 Likes
      • Mary Walker david doll Eli Grey decoded Alexander Nasonov Andreas Mueller Spy Blog 🇬🇧 Bad Advertiser Mitja Kolsek
      3 replies 5 retweets 5 likes
        1. New conversation
        2. Rene Freingruber‏ @ReneFreingruber 23 Jul 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @wdormann

          relocation table is missing :) without a relocation table Microsoft doesn't relocate it (even if ASLR is on). You would need to enable forced ASLR for this.

          1 reply 0 retweets 2 likes
        3. Will Dormann‏ @wdormann 23 Jul 2018
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          Replying to @ReneFreingruber

          If a binary is compiled with /DYNAMICBASE, doesn't that automatically ensure that it has a relocation table? If that's not the case, that seems like a huge oversight, no?

          2 replies 0 retweets 0 likes
        4. 4 more replies
        1. New conversation
        2. Shawn Webb‏ @lattera 23 Jul 2018
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          Replying to @wdormann

          I don't have my win10 VM booted right now, but if I remember right there's a second ASLR setting that you need to set to force execbase randomization. My recollection could be wrong, though.

          1 reply 0 retweets 1 like
        3. Brian in Pittsburgh‏ @arekfurt 23 Jul 2018
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          Replying to @lattera @wdormann

          Bottom-up ASLR?

          2 replies 0 retweets 1 like
        4. 10 more replies
        1. New conversation
        2. Mitja Kolsek‏ @mkolsek 23 Jul 2018
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          Replying to @wdormann

          Wow, I just fired up VLC 2.2.8 on an updated 64bit Windows 7 machine and... there too, vlc.exe is ASLR-enabled but loaded at 0x400000. In addition, Microsoft's apisetschema.dll is also ASLR-enabled and loaded at 0x40000.

          1 reply 2 retweets 5 likes
        3. Mitja Kolsek‏ @mkolsek 23 Jul 2018
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          Replying to @mkolsek @wdormann

          So I learned that apisetschema.dll is automatically loaded into every process, but I haven't learned why it's always mapped to address 0x40000 in some of them (not only vlc.exe) despite being ASLR-enabled.

          1 reply 0 retweets 2 likes
        4. 2 more replies

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