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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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    Will Dormann‏ @wdormann Feb 22
    • Report Tweet
    • Report NetzDG Violation

    Let's say that a vulnerability allowed for RCE as the user "nobody". And said platform includes a setuid binary that allows anyone to run programs as root. How would you assign a CVSS score for the RCE?

    5:00 AM - 22 Feb 2020
    • 3 Retweets
    • 21 Likes
    • Sina Hacker Fantastic Royce Williams Noam Rathaus a crocodile of the mind soaphorn seuo fuckyoushitbitch David Shepard Charles Ellis
    13 replies 3 retweets 21 likes
      1. New conversation
      2. Justin Kennedy‏ @jstnkndy Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann

        Two separate vulnerabilities, and I don't think CVSS takes into account the level of privileges you gain, just whether scope has been changed, right?

        1 reply 0 retweets 3 likes
      3. Will Dormann‏ @wdormann Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @jstnkndy

        Right. So in CVSS 3 terms, it's the difference between a 7.3 and an 8.3

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. New conversation
      2. BenBE‏ @BenBE1987 Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann

        Ask for a second CVE for the vulnerable setuid-binary.

        1 reply 0 retweets 1 like
      3. Will Dormann‏ @wdormann Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @BenBE1987

        Do people have workflows that treat the presence of multiple CVEs in the same product differently than just one? And if so, what does that combinatorial math look like?

        2 replies 0 retweets 1 like
      4. 1 more reply
      1. New conversation
      2. Mitja Kolsek‏ @mkolsek Feb 22
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        Replying to @wdormann

        Is the said setuid a separate vuln or is it part of the system design? If the latter, the CVSS score would be "11 - Commodore 64 called and wanted its security model back"

        1 reply 0 retweets 2 likes
      3. Will Dormann‏ @wdormann Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @mkolsek

        System design.

        1 reply 0 retweets 2 likes
      4. 11 more replies
      1. New conversation
      2. Brent Kennedy‏ @bk_up Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann

        This is exactly why we had trouble using cvss for red team findings. It was hard to tell the full story of the attack chain.

        1 reply 0 retweets 5 likes
      3. Tim MalcomVetter‏ @malcomvetter Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @bk_up @wdormann

        I can’t even imagine trying to use CVSS for red team reporting.

        1 reply 0 retweets 6 likes
      4. 6 more replies
      1. Bryan‏ @bry_campbell Feb 22
        • Report Tweet
        • Report NetzDG Violation
        Replying to @wdormann

        “Nobody is affected” CVSS score 0

        0 replies 0 retweets 16 likes
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      1. Aaron Grattafiori‏ @dyn___ Feb 22
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        Replying to @wdormann

        And thus one of the many problems with CVSS. It's better than nothing, but it's such a hard problem.

        0 replies 0 retweets 3 likes
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