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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. Clément Labro‏ @itm4n 11 Dec 2019
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      New blog post: "CDPSvc DLL Hijacking - From LOCAL SERVICE to SYSTEM" where I mostly talk about Tokens and Impersonation. 🔥 👉 https://itm4n.github.io/cdpsvc-dll-hijacking/ …pic.twitter.com/pqi7k2thcS

      3 replies 111 retweets 205 likes
    2. Will Dormann‏ @wdormann 11 Dec 2019
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      Replying to @itm4n @Ivanlef0u

      The number of services that can be exploited with DLL hijacking is virtually limitless. If a non-admin user can place a file in a SYSTEM-WIDE PATH, then that's the vulnerability. Not any of the services themselves.https://gist.github.com/wdormann/eb714d1d935bf454eb419a34be266f6f …

      1 reply 0 retweets 3 likes
    3. Clément Labro‏ @itm4n 11 Dec 2019
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      Replying to @wdormann @Ivanlef0u

      Wow! We could debate this all day! 😅 But I think you missed the point here. This post wasn't about DLL hijacking. This was just an introduction to some basic Windows Internals. I'll leave you with this simple question though: why did MS "fix" the IKEEXT service in Windows 8.1?

      1 reply 0 retweets 2 likes
    4. Will Dormann‏ @wdormann 11 Dec 2019
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      Replying to @itm4n @Ivanlef0u

      Indeed, it is a very excellent post with details about some Windows internals! It's the part about the prerequisite of being able to drop a file in a System-wide PATH that's glossed over. If that prerequisite is met, there's no need for anything fancier than DLL hijacking.

      1 reply 0 retweets 0 likes
      Will Dormann‏ @wdormann 11 Dec 2019
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      Replying to @wdormann @itm4n @Ivanlef0u

      Why they fixed the one in 8.1 I cannot answer. Maybe it was before they realized that the battle was unwinnable? If MS knows that a user-writable system PATH makes for an exploitable OS, then maybe their OS should tell users whenever that's the case? 🤔

      3:08 PM - 11 Dec 2019
      1 reply 0 retweets 0 likes
        1. Will Dormann‏ @wdormann 11 Dec 2019
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          Replying to @wdormann @itm4n @Ivanlef0u

          Actually, where do you see a reference of Microsoft fixing the IKEEXT service? (CVE) Closest I can find is https://www.immuniweb.com/advisory/HTB23108 … which lists CVEs for each app that has an unprotected dir in the system PATH. Which mirrors what I described. Its unprotected dirs that's the prob.

          0 replies 0 retweets 0 likes
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