full-disclosure - Local suid files and buffer overflows

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Message-ID: <43494568.402@thedarkside.nl>
Date: Sun Oct  9 18:40:24 2005
From: pieter at thedarkside.nl (Pieter de Boer)
Subject: Local suid files and buffer overflows

Werner Schalk wrote:

> 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? 
Some shells (at least bash, that I know of) drop privileges when uid != 
euid. That's why I 'always' use zsh, which doesn't do that ;)

-- 
Pieter