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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 18 Dec 2017

      Rich Felker Retweeted elttam

      How, in this century, did anyone think passing http url params as env vars was an acceptable design? Fix is incomplete & goahead is unfixable.https://twitter.com/elttam/status/942630494054752256 …

      Rich Felker added,

      elttam @elttam
      New blog! Remote LD_PRELOAD exploitation by dan https://www.elttam.com.au/blog/goahead/ 
      1 reply 4 retweets 14 likes
    2. Stephen Kell‏ @stephenrkell 18 Dec 2017
      Replying to @RichFelker

      Very shoddy that this vulnerability made it out. But why "unfixable"? I can think of mitigations, like noexec /tmp, whitelisting or blacklisting envvars, or maybe something funkier (albeit non-POSIXy) around sandboxing environ. I'm sure there are subtleties with all of those...

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @stephenrkell

      It's unfixable (without breaking all existing usage) because the bug is in the public interface by which parameters are passed, not the implementation.

      2 replies 0 retweets 0 likes
    4. Josiah Worcester‏ @pikhq 18 Dec 2017
      Replying to @RichFelker @stephenrkell

      Oddly, I cannot find anywhere in the CGI spec where it says to pass query variables that way. I'm wondering where the idea even came from.

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @pikhq @stephenrkell

      From PHP.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 18 Dec 2017
      Replying to @RichFelker @pikhq @stephenrkell

      The idea is that the user writes CGI as shell scripts the same way you write (hideous, legacy, deprecated) PHP, using $paramname for query params.

      9:28 AM - 18 Dec 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Josiah Worcester‏ @pikhq 18 Dec 2017
          Replying to @RichFelker @stephenrkell

          Gack. Now the question is, how much breaks if you implement the spec only (QUERY_STRING has the query params)?

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 18 Dec 2017
          Replying to @pikhq @stephenrkell

          All existing code written for GoAhead. That's why I called it unfixable.

          2 replies 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 18 Dec 2017
          Replying to @RichFelker @pikhq @stephenrkell

          It's analogous to if you made a C-like language where the only input primitive was gets(). There'd be no way to fix it without overhauling all existing code.

          2 replies 0 retweets 0 likes
        5. @landley‏ @landley 18 Dec 2017
          Replying to @RichFelker @pikhq @stephenrkell

          Well, two mmap() and a signal handler. But no _practical_ way, anyway. :)

          1 reply 0 retweets 1 like
        6. Rich Felker‏ @RichFelker 18 Dec 2017
          Replying to @landley @pikhq @stephenrkell

          At best that lets you safely abort the program on excess input; there's still no way to cleanly recover.

          1 reply 0 retweets 0 likes
        7. @landley‏ @landley 18 Dec 2017
          Replying to @RichFelker @pikhq @stephenrkell

          I'm not saying it's a good idea, but http://pubs.opengroup.org/onlinepubs/009695399/functions/siglongjmp.html … is posix. (Black belt in disgusting solutions to impossible problems.)

          1 reply 0 retweets 1 like
        8. Rich Felker‏ @RichFelker 18 Dec 2017
          Replying to @landley @pikhq @stephenrkell

          longjmp is not AS-safe, so it can be used in a signal handler iff the signal does not interrupt any AS-unsafe functions. All of stdio is AS-unsafe.

          1 reply 0 retweets 0 likes
        9. @landley‏ @landley 18 Dec 2017
          Replying to @RichFelker @pikhq @stephenrkell

          You keep thinking threading is a mandatory part of C.

          1 reply 0 retweets 0 likes
        10. 8 more replies

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