Date: Wed, 14 Jul 2004 09:19:22 -0400
From: <Glenn_Everhart@...kone.com>
To: <rm@...fault.net>, <bugtraq@...urityfocus.com>
Subject: RE: phrack #62 has been released


There are interesting articles on overcoming buffer overflow detectors
in this issue.

However a technique they do not discuss runs something like this:

Instrument the program loader so that instead of simply relocating 
subroutine entry points, it makes up its own code to insert jacket
calls around them (and supporting tables of course). The jacket call
would bump a depth counter, call the originally called subroutine,
and arrange that its return should be a fixed address. At the fixed
address (used for easy recognizing on stack ;-) ) the jacket routine
decrements the depth counter and returns.

(Some complexity around different types of RET instructions exists btw.)

Now also set up some system calls that would be needed to do much
harm to have a little instrumentation added also. The instrumentation
would be to look at the depth counter and make sure there are that many
copies of the magic fixed address return on the stack. Since the jacket
routine puts them there, this should be the case, and one needn't bother
too much over whether BP is used as a frame pointer or not.

If anything gets out of a routine called this way by clobbering a return
address, the return address it would clobber would generally be one
of the magic fixed address returns. Voila! Detection.

Of course a rootkit aware of this could simply push a copy of the magic
address onto the stack, and if you could get execution into your injected
code without clobbering a return address, you would also avoid detection
in this way. Such a scheme is not supernaturally intelligent. However
it is a bit of defensive work that could be tried.

Glenn Everhart


-----Original Message-----
From: phrack staff [mailto:rm@...fault.net]
Sent: Monday, July 12, 2004 9:12 PM
To: bugtraq@...urityfocus.com
Subject: phrack #62 has been released


Hi,

Tue Jul 13 00:58:42 UTC - PHRACK #62 HAS BEEN RELEASED.

        *** NOW AVAILABLE AT HTTP://WWW.PHRACK.ORG ****
        *** NOW AVAILABLE AT HTTP://WWW.PHRACK.ORG ****
        *** NOW AVAILABLE AT HTTP://WWW.PHRACK.ORG ****

   PHRACK MAGAZINE is one of the longest running electronic magazines in
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   to the public, as often as possible, free of charge.

 __^__                                                               __^__
( ___ )-------------------------------------------------------------( ___ )
 | / | 0x01 Introduction                         phrackstaff 0x08 kb | \ |
 | / | 0x02 Loopback                             phrackstaff 0x05 kb | \ |
 | / | 0x03 Linenoise                            phrackstaff 0x21 kb | \ |
 | / | 0x04 Phrack Prophile on scut              phrackstaff 0x0b kb | \ |
 | / | 0x05 Bypassing Win BO Protection            Anonymous 0x25 kb | \ |
 | / | 0x06 Kernel Mode Backdoor for NT           firew0rker 0x81 kb | \ |
 | / | 0x07 Advances in Windows Shellcode                 sk 0x31 kb | \ |
 | / | 0x08 Remote Exec                                grugq 0x3b kb | \ |
 | / | 0x09 UTF8 Shellcode                            greuff 0x32 kb | \ |
 | / | 0x0a Attacking Apache Modules                    andi 0x5e kb | \ |
 | / | 0x0b Radio Hacking                           shaun2k2 0x36 kb | \ |
 | / | 0x0c Win32 Portable Userland Rootkit              kdm 0x48 kb | \ |
 | / | 0x0d Bypassing Windows Personal FW's           rattle 0x59 kb | \ |
 | / | 0x0e A DynamicPolyalphabeticSubstitutionCipher  veins 0x42 kb | \ |
 | / | 0x0f Playing Cards for Smart Profits            ender 0x1a kb | \ |
 | / | 0x10 Phrack World News                    phrackstaff 0x55 kb | \ |
 |___|_____________[  PHRACK, NO FEAR & NO DOUBT   ]_________________|___|
(_____)-------------------------------------------------------------(_____)
   ^                                                                   ^

Enjoy the magazine!

Phrack Magazine Vol 11 Number 62, Build 2, Jul 13, 2004. ISSN 1068-1035
Contents Copyright (c) 2004 Phrack Magazine.  All Rights Reserved.
Nothing may be reproduced in whole or in part without the prior written
permission from the editors.
Phrack Magazine is made available to the public, as often as possible, free
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