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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. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
      • Report Tweet
      • Report NetzDG Violation

      The Apple telnet client installed via homebrew is vulnerable to the issues I described, incidentally Safari supports telnet:// URI handlers but even with telnet installed two warning prompts are displayed and the application is actually not called/reached. cc @tavisopic.twitter.com/T7AxbUhoaD

      4 replies 38 retweets 94 likes
    2. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @hackerfantastic

      Hah, I think this is CVE-2005-0469, so you got your wish, someone did notice the bug 😆 I guess nobody is using this code, and imho the easiest solution is to deprecate it and encourage everyone to migrate to netkit, which appears to be better supported.

      1 reply 0 retweets 10 likes
    3. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso

      I think the bug your referencing is SLC options related and not the same flaws being described here, I'm counting more than one heap issue - a stack based overflow and also the remote crash related to environment handling (apparently netkit impacted as well). Just use OpenSSH ;)

      1 reply 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso 12 Dec 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @hackerfantastic

      I think it's the same, (or 0468, I read a combined diff for both). I'm not including the stack buffer overflow, because I think it's debatable if that's a vulnerability in telnet or not. Perhaps you can convince other people though, I'm not the vulnerability police. 😛

      10:41 PM - 12 Dec 2018
      • 3 Likes
      • BP Jason Danner Hacker Fantastic
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Hacker Fantastic‏ @hackerfantastic 12 Dec 2018
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          Replying to @taviso

          Checked both, the second one is closer to the problem identified but only because it's in related code - I'm fairly certain these need a CVE assignment, the stack overflow has limited uses but it's still an issue for systems like Mikrotik.

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 12 Dec 2018
          • Report Tweet
          • Report NetzDG Violation
          Replying to @hackerfantastic

          Sure, if you're certain Mikrotik intended it to be a security boundary, but maybe check CVS history, it might already have a CVE 😆

          1 reply 0 retweets 2 likes
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