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Category:   OS (UNIX)  >   FreeBSD Kernel Vendors:   FreeBSD
FreeBSD file(1) and libmagic(3) File Processing Flaws Let Remote Users Deny Service
SecurityTracker Alert ID:  1031344
SecurityTracker URL:  http://securitytracker.com/id/1031344
CVE Reference:   CVE-2014-3710, CVE-2014-8116, CVE-2014-8117   (Links to External Site)
Date:  Dec 11 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.4, 9.1, 9.2, 9.3, 10.0, 10.1
Description:   A vulnerability was reported in FreeBSD. A local user can cause denial of service conditions.

A local user can trigger several flaws in the ELF parser to cause the libmagic(3) library (used by the file(1) utility) to consume excessive resources or crash.

Thomas Jarosch of Intra2net AG reported these vulnerabilities.

Impact:   A local user can cause the target system to consume excessive resources or crash.
Solution:   The vendor has issued a fix.

The vendor's advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-14:28.file.asc

Vendor URL:  security.FreeBSD.org/advisories/FreeBSD-SA-14:28.file.asc (Links to External Site)
Cause:   State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 11 2016 (Red Hat Issues Fix for file) FreeBSD file(1) and libmagic(3) File Processing Flaws Let Remote Users Deny Service
Red Hat has issued a fix for file for Red Hat Enterprise Linux 6.



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-14:28.file

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-14:28.file                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Multiple vulnerabilities in file(1) and libmagic(3)

Category:       contrib
Module:         file
Announced:      2014-12-10
Affects:        All supported versions of FreeBSD.
Credits:        Thomas Jarosch of Intra2net AG
Corrected:      2014-12-10 08:26:53 UTC (stable/10, 10.1-STABLE)
                2014-12-10 08:35:55 UTC (releng/10.1, 10.1-RELEASE-p1)
                2014-12-10 08:36:07 UTC (releng/10.0, 10.0-RELEASE-p13)
                2014-12-10 08:31:41 UTC (stable/9, 9.3-STABLE)
                2014-12-10 08:36:40 UTC (releng/9.3, 9.3-RELEASE-p6)
                2014-12-10 08:36:40 UTC (releng/9.2, 9.2-RELEASE-p16)
                2014-12-10 08:36:40 UTC (releng/9.1, 9.1-RELEASE-p23)
                2014-12-10 08:31:41 UTC (stable/8, 8.4-STABLE)
                2014-12-10 08:36:40 UTC (releng/8.4, 8.4-RELEASE-p20)
CVE Name:       CVE-2014-3710, CVE-2014-8116, CVE-2014-8117

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

There are a number of denial of service issues in the ELF parser used
by file(1).

III. Impact

An attacker who can cause file(1) or any other applications using the
libmagic(3) library to be run on a maliciously constructed input can
cause the application to crash or consume excessive CPU resources,
resulting in a denial-of-service.

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 a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

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

[FreeBSD 10.1]
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-12.patch
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-12.patch.asc
# gpg --verify file-12.patch.asc

[FreeBSD 9.1, 9.2, 9.3 and 10.0]
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-8.patch
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-8.patch.asc
# gpg --verify file-8.patch.asc

[FreeBSD 8.4]
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-7.patch
# fetch http://security.FreeBSD.org/patches/SA-14:28/file-7.patch.asc
# gpg --verify file-7.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.

Restart all deamons using the library, or reboot the system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/8/                                                         r275669
releng/8.4/                                                       r275672
stable/9/                                                         r275669
releng/9.1/                                                       r275672
releng/9.2/                                                       r275672
releng/9.3/                                                       r275672
stable/10/                                                        r275668
releng/10.0/                                                      r275671
releng/10.1/                                                      r275670
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3710>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8116>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8117>

The latest revision of this advisory is available at
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:28.file.asc>
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