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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. Jonas Termansen‏ @sortiecat 10 Aug 2017

      Curiously GNU tar is immune to CVE-2017-9800 because it DNS resolves when you invoke that other vulnerability nobody fixed yet: tar xf -V:

      2 replies 2 retweets 2 likes
    2. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      Colons in the path makes tar surprisingly invokes rsh (ssh) transparently to access the tar remotely, violating the POSIX specification.

      2 replies 2 retweets 2 likes
    3. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      No CVE for this as far as I know.

      1 reply 0 retweets 1 like
    4. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      Upload a tar, remote site checks it for safety, they untar, connects back to your site, you replace contents on the fly. Or just info leak.

      1 reply 0 retweets 1 like
    5. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      The feature is fine for all I care -- it just needs to be put behind an command line option. Don't surprise.

      2 replies 1 retweet 1 like
    6. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      wget https://example.com/example.com:tarbomb.tar … # So far so good

      1 reply 1 retweet 1 like
    7. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      sha256sum http://example.com :tarbomb.tar # Oh cool the checksum is right

      1 reply 1 retweet 1 like
    8. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      tar xf http://example.com :tarbomb.tar # Boom connects to http://example.com  and new contents

      1 reply 2 retweets 2 likes
    9. Jonas Termansen‏ @sortiecat 10 Aug 2017
      Replying to @sortiecat

      This dangerous feature is documented in the info page at https://www.gnu.org/software/tar/manual/html_section/tar_46.html#local-and-remote-archives … which means it's entirely surprising to most people

      1 reply 3 retweets 2 likes
      Rich Felker‏ @RichFelker 10 Aug 2017
      Replying to @sortiecat

      Thankfully busybox tar lacks this "feature".

      2:56 PM - 10 Aug 2017
      • 2 Likes
      • dwc 🏴 Jonas Termansen
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Ed Maste‏ @ed_maste 10 Aug 2017
          Replying to @RichFelker @sortiecat

          bsdtar too

          1 reply 0 retweets 3 likes
        3. Bryan Steele‏ @canadianbryan 10 Aug 2017
          Replying to @ed_maste @RichFelker @sortiecat

          OpenBSD pax/tar also, this is strictly a GNU tar misfeature.

          1 reply 1 retweet 4 likes
        4. 1 more reply

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