Re: [Test] exec-shield-2.6.0-test5-G2 vs. paxtest & libsafe

From: Gabor MICSKO
Date: Sat Sep 27 2003 - 15:19:05 EST

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2003-09-27, szo keltezéssel Ingo Molnar ezt írta:

> thanks for the testing. The ELF loader changes had a bug which ended up in
> creating an extra executable page after .bss, failing some of the tests.
> I've fixed this, could you try the -G3 patch?:
>
> redhat.com/~mingo/exec-shield/exec-shield-2.6.0-test5-G3
> redhat.com/~mingo/exec-shield/exec-shield-2.6.0-test5-bk12-G3

Yes, this patch really better.

Kernel:
Linux sunshine 2.6.0-test5-exec-shield-nptl #3 SMP 2003. sze. 27.,
szombat, 21.48.27 CEST i686 GNU/Linux

Exec-shield patch:
http://redhat.com/~mingo/exec-shield/exec-shield-2.6.0-test5-G3

Test programs:
http://www.research.avayalabs.com/project/libsafe/src/libsafe-2.0-16.tgz
http://pageexec.virtualave.net/paxtest-0.9.1.tar.gz

===========================================
sunshine:/home/trey/exec/libsafe-2.0-16/exploits# echo "2" >
/proc/sys/kernel/exec-shield
sunshine:/home/trey/exec/libsafe-2.0-16/exploits# cat
/proc/sys/kernel/exec-shield
2
===========================================

libsafe-2.0-16 (exec-shield full protection):

---------------------------------------------------------------------
sunshine:/home/trey/exec/libsafe-2.0-16/exploits# ./canary-exploit
This program tries to use printf("%n") to overwrite the
return address on the stack.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
sunshine:/home/trey/exec/libsafe-2.0-16/exploits#
---------------------------------------------------------------------

---------------------------------------------------------------------
sunshine:/home/trey/exec/libsafe-2.0-16/exploits#
./exploit-non-exec-stack
This program demonstrates how a (stack) buffer overflow
can attack linux kernels with *non-executable* stacks.
This is variation on return-int-libc attack.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
sunshine:/home/trey/exec/libsafe-2.0-16/exploits#
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t1
This program tries to use strcpy() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t1w
This program tries to use strcpy() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t3
This program will exec() a new program. The new program will
overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t3w
This program will exec() a new program. The new program will
overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t4
This program will fork() child process, and the child
will overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
parent process terminating
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t4w
This program will fork() child process, and the child
will overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
parent process terminating
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t5
This program tries to use strcat() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t6
This program tries to use scanf() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
Szegmens hiba
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

===========================================
sunshine:/home/trey/exec/libsafe-2.0-16/exploits# echo "0" >
/proc/sys/kernel/exec-shield
sunshine:/home/trey/exec/libsafe-2.0-16/exploits# cat
/proc/sys/kernel/exec-shield
0
===========================================

libsafe-2.0-16 (exec-shield off):

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./canary-exploit
This program tries to use printf("%n") to overwrite the
return address on the stack.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./exploit-non-exec-stack
This program demonstrates how a (stack) buffer overflow
can attack linux kernels with *non-executable* stacks.
This is variation on return-int-libc attack.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t1
This program tries to use strcpy() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t1w
This program tries to use strcpy() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t3
This program will exec() a new program. The new program will
overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
You have new mail in /var/mail/trey
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t3w
This program will exec() a new program. The new program will
overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t4
This program will fork() child process, and the child
will overflow the buffer using strcpy().
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
parent process terminating
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t5
This program tries to use strcat() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

---------------------------------------------------------------------
trey@sunshine:~/exec/libsafe-2.0-16/exploits$ ./t6
This program tries to use scanf() to overflow the buffer.
If you get a /bin/sh prompt, then the exploit has worked.
Press any key to continue...
sh-2.05b$ exit
exit
trey@sunshine:~/exec/libsafe-2.0-16/exploits$
---------------------------------------------------------------------

*********************************************************************

===========================================
sunshine:/home/trey/exec/paxtest-0.9.1# echo "2" >
/proc/sys/kernel/exec-shield
sunshine:/home/trey/exec/paxtest-0.9.1# cat /proc/sys/kernel/exec-shield
2
===========================================

paxtest-0.9.1 (exec-shield full protection):

sunshine:/home/trey/exec/paxtest-0.9.1# ./paxtest
It may take a while for the tests to complete
Test results:
Executable anonymous mapping : Killed
Executable bss : Killed
Executable data : Killed
Executable heap : Killed
Executable stack : Killed
Executable anonymous mapping (mprotect) : Killed
Executable bss (mprotect) : Vulnerable
Executable data (mprotect) : Vulnerable
Executable heap (mprotect) : Vulnerable
Executable shared library bss (mprotect) : Vulnerable
Executable shared library data (mprotect): Vulnerable
Executable stack (mprotect) : Vulnerable
Anonymous mapping randomisation test : 16 bits (guessed)
Heap randomisation test (ET_EXEC) : 13 bits (guessed)
Heap randomisation test (ET_DYN) : 13 bits (guessed)
Main executable randomisation (ET_EXEC) : No randomisation
Main executable randomisation (ET_DYN) : 12 bits (guessed)
Shared library randomisation test : 12 bits (guessed)
Stack randomisation test (SEGMEXEC) : 17 bits (guessed)
Stack randomisation test (PAGEEXEC) : 17 bits (guessed)
Return to function (strcpy) : Vulnerable
Return to function (memcpy) : Vulnerable
Executable shared library bss : Killed
Executable shared library data : Killed
Writable text segments : Vulnerable

===========================================
sunshine:/home/trey/exec/paxtest-0.9.1# echo "0" >
/proc/sys/kernel/exec-shield
sunshine:/home/trey/exec/paxtest-0.9.1# cat /proc/sys/kernel/exec-shield
0
===========================================

paxtest-0.9.1 (exec-shield off):

sunshine:/home/trey/exec/paxtest-0.9.1# ./paxtest
It may take a while for the tests to complete
Test results:
Executable anonymous mapping : Vulnerable
Executable bss : Vulnerable
Executable data : Vulnerable
Executable heap : Vulnerable
Executable stack : Vulnerable
Executable anonymous mapping (mprotect) : Vulnerable
Executable bss (mprotect) : Vulnerable
Executable data (mprotect) : Vulnerable
Executable heap (mprotect) : Vulnerable
Executable shared library bss (mprotect) : Vulnerable
Executable shared library data (mprotect): Vulnerable
Executable stack (mprotect) : Vulnerable
Anonymous mapping randomisation test : No randomisation
Heap randomisation test (ET_EXEC) : No randomisation
Heap randomisation test (ET_DYN) : No randomisation
Main executable randomisation (ET_EXEC) : No randomisation
Main executable randomisation (ET_DYN) : No randomisation
Shared library randomisation test : No randomisation
Stack randomisation test (SEGMEXEC) : No randomisation
Stack randomisation test (PAGEEXEC) : No randomisation
Return to function (strcpy) : Vulnerable
Return to function (memcpy) : Vulnerable
Executable shared library bss : Vulnerable
Executable shared library data : Vulnerable
Writable text segments : Vulnerable

-----------------------------------------
#EOF

--
Windows not found
(C)heers, (P)arty or (D)ance?
-----------------------------------
Micskó Gábor
Compaq Accredited Platform Specialist, System Engineer (APS, ASE)
Szintézis Computer Rendszerház Rt.
H-9021 Győr, Tihanyi Árpád út 2.
Tel: +36-96-502-216
Fax: +36-96-318-658
E-mail: gmicsko@xxxxxxxxxxxx
Web: http://www.hup.hu/

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Next message: Pavel Machek: "Re: [PATCH 8/8] Add BTN_TOUCH to Synaptics driver. Update mousedev."
Previous message: Pavel Machek: "pm: Revert swsusp to 2.6.0-test3 state"
In reply to: Breno: "Re: [Test] exec-shield-2.6.0-test5-G2 vs. paxtest & libsafe"
Next in thread: Stef van der Made: "Onstream DI-30 locks up PC when in use"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]