Re: Local suid files and buffer overflows

[Eduardo Tongson <propolice () gmail com>]

> Hi,
>
> first of all apologies for asking such a newbie question but I am trying
> to learn how to exploit buffer overflows and therefore wrote a little
> program to exploit. This little program has the following permissions:
>
> $ ls -la test1
> -rwsr-sr-x  1 root root 17164 Oct  8 01:25 test1
>
> Now I exploited it using Aleph One's shellcode (see
> http://shellcode.org/shellcode/linux/null-free/) but I won't get a SUID
> shell afterwards (I know the exploit did work but I still have my normal
> user privleges). Why? I have tried a different shellcode to write a file
> and this file was root:root. Any ideas, hints, rtfm?
>
> Thank you.

Use a setreuid/setuid shellcode <http://shellcode.org/shellcode/linux/setuid/>

-ed

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/