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Comment by not_your_vase

19 hours ago

Is there a readable version of the exploit readily available by any chance? Gotta admit that I failed binary-zip-interpretation-with-naked-eye class twice

4 comments

not_your_vase

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progval  19 hours ago

The binary "zip" isn't the exploit, it's the shellcode. The exploit is the rest, which changes the code of a SUID executable (su).

stackghost  17 hours ago

The call to zlib basically overwrites a minimal ELF into a portion of the `su` binary, which exceve's /bin/sh.

  • Sophira  3 hours ago

    To be specific, the zlib'd binary basically does this (except that it directly uses Linux syscalls to do so rather then C wrappers):

        setuid(0);
    execve("/bin/sh", NULL, NULL);
    exit(0);