bugtraq - Re: Samba 3.x + kernel 2.6.x local root vulnerability

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Message-ID: <20040209220347.GH17237@wirex.com>
Date: Mon, 9 Feb 2004 14:03:47 -0800
From: Seth Arnold <sarnold@...ex.com>
To: bugtraq@...urityfocus.com
Subject: Re: Samba 3.x + kernel 2.6.x local root vulnerability

On Mon, Feb 09, 2004 at 10:23:03PM +0100, Michal Medvecky wrote:
> Confirmed to work on all 2.6.x kernels, not confirmed on 2.4.x.

I haven't got a clue what you're trying to accomplish. If you don't want
a setuid execute, DON'T RUN chmod +s! You don't even need samba to
accomplish this:

$ cat > a.c <<EOF
> main()
> {
>         setuid(0);
>         setgid(0);
>         system("/bin/bash");
> }
> EOF
$ make a
cc     a.c   -o a
$ sudo chown root:root a
Password:
$ sudo chmod +s a
$ ./a
$ id
uid=0(root) gid=0(root) groups=500(sarnold)
$ exit

I expect this behaviour out of every Linux, BSD, commercial Unix,
Windows NT with POSIX emulation, QNX, etc. (For the curious, this was
run on Linux 2.4.21-9.EL_imnx_2smp.)

Can you please explain what specifically bothers you?

Thanks :)

-- 
Immunix Secured Linux Distribution: http://immunix.org/

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