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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Josh Bressers‏ @joshbressers 12 Dec 2018
      • Report Tweet
      • Report NetzDG Violation

      Josh Bressers Retweeted Hacker Fantastic

      1) Open source isn't more secure. This is an old assumption. 2) There is no such thing as closed source anymore. Everything is chocked full of open source.https://twitter.com/hackerfantastic/status/1072533649411751937 …

      Josh Bressers added,

      Hacker Fantastic @hackerfantastic
      "open-source is more secure than closed-source because you can view the source code" ... GNU inetutils <= 1.9.4 telnet.c multiple overflows https://hacker.house/releasez/expl0itz/inetutils-telnet.txt …
      6 replies 6 retweets 34 likes
    2. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @joshbressers

      I disagree, the reason nobody paid much attention to telnet in inetutils is because a) nobody uses it and b) it's not security sensitive. telnet isn't setuid, and if you can set DISPLAY, you might as well just set LD_PRELOAD, or use !sh to just run commands.

      2 replies 2 retweets 32 likes
    3. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @taviso @joshbressers

      People do use OpenSSH and it *is* security sensitive, and you better believe people study every line. I wouldn't trust any proprietary SSH implementation.

      2 replies 6 retweets 36 likes
    4. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
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      Replying to @taviso @joshbressers

      Hacker Fantastic Retweeted Hacker Fantastic

      He is not wrong, though USER= is passed via -l and could be set in a URI handler via user@ making it more interesting as the heap code be remotely reachable -https://twitter.com/hackerfantastic/status/1065095950606221312?s=19 …

      Hacker Fantastic added,

      Hacker Fantastic @hackerfantastic
      I've never seen "encryption-free" SSH, I didn't believe it was real - so I looked it up. @mikrotik_com permit you to login via password based authentication over SSH... in clear-text! My password is "SECRETKEY" and can be clearly seen once "none" is selected as a cipher type. 🙄 pic.twitter.com/sBM2MRs7sR
      2 replies 0 retweets 8 likes
    5. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @hackerfantastic @joshbressers

      Do you have an example of any vulnerable usage? It's hard to believe anybody is doing that, that's what I mean: I don't think anybody spent any time auditing telnet from inetutils, because it's not used anywhere security sensitive.

      5 replies 0 retweets 6 likes
    6. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
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      Replying to @taviso @joshbressers

      telnet has been removed as a URI handler from modern browsers, there are plenty of embedded devices with restricted shells though.

      1 reply 0 retweets 0 likes
    7. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @hackerfantastic @joshbressers

      Yep, I've never seen any telnet:// URI handler that would invoke telnet from inetutils. Do you have an example of an embedded device that allows you to invoke it in such a way? I think most would use BSD variants, I'm surprised to hear "plenty".

      2 replies 0 retweets 2 likes
    8. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
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      Replying to @taviso @joshbressers

      NetBSD contains the vulnerable code path and I linked you to a platform using it already ;-)

      2 replies 0 retweets 1 like
    9. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @hackerfantastic @joshbressers

      I don't think NetBSD would be using GNU inetutils. They might have a similar bug, but the same point applies that it has to be used in a security sensitive context (a telnet:// URI handler, for example). Are you saying that Mikrotik is using it and it is vulnerable?

      1 reply 1 retweet 0 likes
    10. This Tweet is unavailable.
      Tavis Ormandy‏Verified account @taviso 12 Dec 2018
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      Replying to @kapitaali_com @hackerfantastic @joshbressers

      Yep, in pkgsrc, that's not part of NetBSD. Nobody is disputing the bug exists, I'm asking if there any usages that make it a security bug.

      8:50 AM - 12 Dec 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
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          Replying to @taviso @kapitaali_com @joshbressers

          I gave you examples already, I gotta run feel free to continue the discussion on oss-security - https://hacker.house/releasez/expl0itz/mikrotik-jailbreak.txt …

          1 reply 0 retweets 0 likes
        3. Joshua Hill‏ @p0sixninja 12 Dec 2018
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          Replying to @hackerfantastic @taviso and

          I reported a similar bug in windows telnet client in 1998. they laughed at me

          2 replies 0 retweets 3 likes
        4. 4 more replies

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