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Category:   Application (Generic)  >   file Vendors:   Darwin, Ian F.
(FreeBSD Issues Fix) file Heap Overflow in file_printf() May Let Local Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018104
SecurityTracker URL:  http://securitytracker.com/id/1018104
CVE Reference:   CVE-2007-1536   (Links to External Site)
Date:  May 23 2007
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 4.20
Description:   A vulnerability was reported in file. A local user may be able to obtain elevated privileges on the target system.

A local user can trigger a heap overflow in the file_printf() function to cause arbitrary code to be executed on the target system with the privileges of the user running the file application.

The vendor credits Jean-Sebastien Guay-Leroux with discovering this vulnerability.

Impact:   A local user may be able to obtain elevated privileges on the target system.
Solution:   FreeBSD has released a fix and has provided the following solution instructions [quoted].

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 5.5]
# fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch
# fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch.asc

[FreeBSD 6.1 and 6.2]
# fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch
# fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libmagic
# make obj && make depend && make && make install

The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-07:04.file.asc

Cause:   Boundary error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  5.5, 6.1, 6.2

Message History:   This archive entry is a follow-up to the message listed below.
Mar 20 2007 file Heap Overflow in file_printf() May Let Local Users Execute Arbitrary Code



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-07:04.file


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
FreeBSD-SA-07:04.file                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Heap overflow in file(1)

Category:       contrib
Module:         file
Announced:      2007-05-23
Affects:        All FreeBSD releases.
Corrected:      2007-05-23 16:12:51 UTC (RELENG_6, 6.2-STABLE)
                2007-05-23 16:13:07 UTC (RELENG_6_2, 6.2-RELEASE-p5)
                2007-05-23 16:13:20 UTC (RELENG_6_1, 6.1-RELEASE-p17)
                2007-05-23 16:12:10 UTC (RELENG_5, 5.5-STABLE)
                2007-05-23 16:12:35 UTC (RELENG_5_5, 5.5-RELEASE-p13)
CVE Name:       CVE-2007-1536

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I.   Background

The file(1) utility attempts to classify file system objects based on
filesystem, magic number and language tests.

The libmagic(3) library provides most of the functionality of file(1)
and may be used by other applications.

II.  Problem Description

When writing data into a buffer in the file_printf function, the length
of the unused portion of the buffer is not correctly tracked, resulting
in a buffer overflow when processing certain files.

III. Impact

An attacker who can cause file(1) to be run on a maliciously constructed
input can cause file(1) to crash.  It may be possible for such an attacker
to execute arbitrary code with the privileges of the user running file(1).

The above also applies to any other applications using the libmagic(3)
library.

IV.  Workaround

No workaround is available, but systems where file(1) and other
libmagic(3)-using applications are never run on untrusted input are not
vulnerable.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 5.5]
# fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch
# fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch.asc

[FreeBSD 6.1 and 6.2]
# fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch
# fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libmagic
# make obj && make depend && make && make install

VI.  Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_5
  src/contrib/file/file.h                                     1.1.1.7.2.1
  src/contrib/file/funcs.c                                    1.1.1.1.2.1
  src/contrib/file/magic.c                                    1.1.1.1.2.1
RELENG_5_5
  src/UPDATING                                            1.342.2.35.2.13
  src/sys/conf/newvers.sh                                  1.62.2.21.2.15
  src/contrib/file/file.h                                     1.1.1.7.8.1
  src/contrib/file/funcs.c                                    1.1.1.1.8.1
  src/contrib/file/magic.c                                    1.1.1.1.8.1
RELENG_6
  src/contrib/file/file.h                                     1.1.1.8.2.1
  src/contrib/file/funcs.c                                    1.1.1.2.2.1
  src/contrib/file/magic.c                                    1.1.1.2.2.1
RELENG_6_2
  src/UPDATING                                             1.416.2.29.2.8
  src/sys/conf/newvers.sh                                   1.69.2.13.2.8
  src/contrib/file/file.h                                     1.1.1.8.8.1
  src/contrib/file/funcs.c                                    1.1.1.2.8.1
  src/contrib/file/magic.c                                    1.1.1.2.8.1
RELENG_6_1
  src/UPDATING                                            1.416.2.22.2.19
  src/sys/conf/newvers.sh                                  1.69.2.11.2.19
  src/contrib/file/file.h                                     1.1.1.8.6.1
  src/contrib/file/funcs.c                                    1.1.1.2.6.1
  src/contrib/file/magic.c                                    1.1.1.2.6.1
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1536

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-07:04.file.asc
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