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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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    Rich Felker‏ @RichFelker Mar 4

    Interesting glibc security tidbit: if you have an attack that can create arbitrary files, but not clobber existing ones or control contents, /etc/suid-debug could be a nice target.

    7:03 PM - 4 Mar 2018
    • 25 Retweets
    • 50 Likes
    • chaignc lystena Carl Trachte Trix Farrar dostoevsky Security Skellington ツ RandomȺdversary Lars Viklund Peter B
    3 replies 25 retweets 50 likes
      1. Rich Felker‏ @RichFelker Mar 4

        man ld\.sopic.twitter.com/Ve8CHKxabR

        1 reply 7 retweets 18 likes
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      1. New conversation
      2. Danny Davos‏ @io_r_us Mar 5
        Replying to @RichFelker @sortiecat

        Yeah yet can one also set the permissions ? Or is such also optional ?

        1 reply 0 retweets 0 likes
      3. Rich Felker‏ @RichFelker Mar 5
        Replying to @io_r_us @sortiecat

        The only thing glibc checks is existence of the file. Perms don't matter. If it's there, you can use LD_DEBUG on suids, exposing a lot of additional attack surface.

        1 reply 0 retweets 1 like
      4. Danny Davos‏ @io_r_us Mar 5
        Replying to @RichFelker @sortiecat

        One of those red flags making people to run screaming into the BSD tentcamp

        1 reply 0 retweets 2 likes
      5. Rich Felker‏ @RichFelker Mar 5
        Replying to @io_r_us @sortiecat

        I don't understand how any of this ever got past basic common sense: "if suid, don't process any LD_* vars, at all, whatsoever".

        2 replies 0 retweets 2 likes
      6. Rich Felker‏ @RichFelker Mar 5
        Replying to @RichFelker @io_r_us @sortiecat

        musl version of this: https://git.musl-libc.org/cgit/musl/tree/ldso/dynlink.c?id=v1.1.19#n1482 …pic.twitter.com/j2cbKRZGd0

        0 replies 2 retweets 3 likes
      7. End of conversation
      1. Tim Brown‏ @timb_machine Mar 5
        Replying to @RichFelker

        /etc/ld.so.conf.d/* can b useful too... an empty file in there can be rewarding if (ab)used right.

        0 replies 1 retweet 4 likes
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