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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. Cybergibbons‏ @cybergibbons 23 Sep 2019
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      Yo! @F5Networks @F5Security https://support.f5.com/csp/article/K58240755 … This reads awfully like a vulnerability. Why no CVE?

      3 replies 7 retweets 30 likes
    2. This Tweet is unavailable.
    3. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @savagejen @cybergibbons and

      There was a lot of discussion on this one, but in the end it was not considered a vulnerability. This is deliberate functionality in place due to customer needs to install third party software via APM to enforce requirements for VPN access, etc. Continued...

      2 replies 0 retweets 0 likes
    4. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @megazone @savagejen and

      The attack is really in getting a target to install a malicious cert into the trust store, so that the system then will trust and install other code. But we can't know if a cert is legit or not, if it is trusted by Windows then it is trusted to validate code signing.

      1 reply 0 retweets 0 likes
    5. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @megazone @savagejen and

      We (F5) agreed it was worth making customers aware of the importance of keeping the trust store, well, trustworthy, which is why that document was published. But the conclusion was that the root of the issue is outside of the F5 product itself.

      1 reply 1 retweet 1 like
    6. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @megazone @savagejen and

      If you can compromise the trust store and get a malicious cert trusted then it opens up multiple possibilities of attack. You've undermined code signing as protection at that point.

      1 reply 0 retweets 1 like
    7. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @megazone @savagejen and

      Clearly not a black and white issue, and I'm sure not everyone will agree with the conclusion. It wasn't reached lightly, there was a lot of discussion about it. The researcher, T Shiomitsu with Pen Test Partners, was kind enough to work with us to draft the article.

      1 reply 0 retweets 1 like
    8. Dan Kaminsky‏Verified account @dakami 23 Sep 2019
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      Replying to @megazone @savagejen and

      Intriguing. I'm very familiar with this attack class (worked on IE before a lot of this was locked down) and definitely appreciate your nuance. It's a little fuzzy to me, what *precisely* happens with a non-F5 signed CAB file, using a stock Authenticode signature?

      1 reply 0 retweets 0 likes
    9. MegaZone‏ @megazone 23 Sep 2019
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      Replying to @dakami @savagejen and

      I'm not the Windows expert, @savagejen is an old friend and I responded since she flagged me down, but if the CAB is not F5-signed the user gets prompted with the actual signer. If they proceed then it goes through the standard Windows checks, UAC pops if privileges are required.

      2 replies 0 retweets 0 likes
    10. Will Dormann‏ @wdormann 24 Sep 2019
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      Replying to @megazone @dakami and

      1) "Deliberate functionality" does *not* preclude a designed capability from being CVE-worthy. 2) "UAC pops 𝗶𝗳 𝗽𝗿𝗶𝘃𝗶𝗹𝗲𝗴𝗲𝘀 𝗮𝗿𝗲 𝗿𝗲𝗾𝘂𝗶𝗿𝗲𝗱" Are you saying that code not requiring admin privileges to be installed can be silently installed using an f5-epi:// URI?

      1 reply 0 retweets 2 likes
      Will Dormann‏ @wdormann 3 Oct 2019
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      Replying to @wdormann @megazone and

      I dug into this a little bit. Given the flurry of warnings presented to the user before running code in the case I came up with, I can't imagine that this is CVE-worthy. What's it take to run an Office Macro? One button click? And that doesn't have a CVE...pic.twitter.com/8XqdKUZWa2

      8:13 AM - 3 Oct 2019
      0 replies 0 retweets 1 like

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