BugTraq
COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 14 2007 03:17PM
Wojciech Purczynski (cliph isec pl) (2 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 14 2007 09:03PM
Wojciech Purczynski (cliph isec pl) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 12:46PM
Dan Yefimov (dan ns15 lightwave net ru) (1 replies)
On Tue, 14 Aug 2007, Wojciech Purczynski wrote:

>
> Small correction - I forgot to add setuid(0) ;)
>
> PARENT CHILD
> ----------------------------------------------------------------
> fork()
> prctl(PR_SET_PDEATHSIG)
> execve("/bin/setuid-binary")
> setuid(0)
> exit()'ed or killed
> child receives NO signal this time
>
>
> PARENT CHILD
> ----------------------------------------------------------------
> fork()
> prctl(PR_SET_PDEATHSIG)
> execve("/bin/setuid-binary")
> setuid(0)
> execve("/bin/setuid-binary")
> exit()'ed or killed
> privileged process receives the signal
>
This doesn't change anything in what I said previously. If the sender's EUID or
RUID equals to any of SUID or RUID of the victim or the sender process is root,
the sender can send any signal to the victim; if none of those conditions are
met, it obviously can't, no matter how and what signal it sends. For details
look at check_kill_permission() and group_send_sig_info() in kernel/signal.c
and reparent_thread() in kernel/exit.c in the kernel source tree (version
2.6.22).
--

Sincerely Your, Dan.

[ reply ]
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 07:09PM
Wojciech Purczynski (cliph isec pl) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 08:50PM
Dan Yefimov (dan ns15 lightwave net ru) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 09:05PM
Wojciech Purczynski (cliph isec pl) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 09:19PM
Dan Yefimov (dan ns15 lightwave net ru) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 09:37PM
Wojciech Purczynski (cliph isec pl)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 14 2007 06:20PM
Dan Yefimov (dan ns15 lightwave net ru) (2 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 03:23PM
Glynn Clements (glynn gclements plus com) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 15 2007 05:54PM
Dan Yefimov (dan ns15 lightwave net ru) (1 replies)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 16 2007 01:18AM
Glynn Clements (glynn gclements plus com)
Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability Aug 14 2007 08:18PM
Wojciech Purczynski (cliph isec pl)


 

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