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ESB-2014.1032 - [FreeBSD] file: Denial of service - Remote with user interaction

Date: 25 June 2014
References: ESB-2012.0233.3  ESB-2014.0199  ESB-2014.0265  ESB-2014.0326.2  ESB-2014.0859  ESB-2014.1327  ESB-2014.1331  ESB-2014.1431  ESB-2014.1843  ESB-2014.2005  
ESB-2016.1150  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2014.1032
            Multiple vulnerabilities in file(1) and libmagic(3)
                               25 June 2014

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           file
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Denial of Service -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-2270 CVE-2014-1943 CVE-2013-7345
                   CVE-2012-1571  

Reference:         ESB-2014.0859
                   ESB-2014.0326.2
                   ESB-2014.0265
                   ESB-2014.0199
                   ESB-2012.0233.3

Original Bulletin: 
   ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-14:16.file.asc

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=============================================================================
FreeBSD-SA-14:16.file                                       Security Advisory
                                                          The FreeBSD Project

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

Category:       contrib
Module:         file
Announced:      2014-06-24
Affects:        All supported versions of FreeBSD.
Corrected:      2014-06-24 19:04:55 UTC (stable/10, 10.0-STABLE)
                2014-06-24 19:05:08 UTC (releng/10.0, 10.0-RELEASE-p6)
                2014-06-24 19:04:55 UTC (stable/9, 9.3-PRERELEASE)
                2014-06-24 19:05:19 UTC (releng/9.3, 9.3-RC2)
                2014-06-24 19:05:36 UTC (releng/9.2, 9.2-RELEASE-p9)
                2014-06-24 19:05:36 UTC (releng/9.1, 9.1-RELEASE-p16)
                2014-06-24 19:04:55 UTC (stable/8, 8.4-STABLE)
                2014-06-24 19:05:47 UTC (releng/8.4, 8.4-RELEASE-p13)
CVE Name:       CVE-2012-1571, CVE-2013-7345, CVE-2014-1943, CVE-2014-2270

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

A specifically crafted Composite Document File (CDF) file can trigger an
out-of-bounds read or an invalid pointer dereference. [CVE-2012-1571]

A flaw in regular expression in the awk script detector makes use of
multiple wildcards with unlimited repetitions. [CVE-2013-7345]

A malicious input file could trigger infinite recursion in libmagic(3).
[CVE-2014-1943]

A specifically crafted Portable Executable (PE) can trigger out-of-bounds
read. [CVE-2014-2270]

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
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 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 9.1, 9.2, 9.3, 10.0]
# fetch http://security.FreeBSD.org/patches/SA-14:16/file.patch
# fetch http://security.FreeBSD.org/patches/SA-14:16/file.patch.asc
# gpg --verify file.patch.asc

[FreeBSD 8.4]
# fetch http://security.FreeBSD.org/patches/SA-14:16/file-8.4.patch
# fetch http://security.FreeBSD.org/patches/SA-14:16/file-8.4.patch.asc
# gpg --verify file.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.

3) 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

VI.  Correction details

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

Branch/path                                                      Revision
- - -------------------------------------------------------------------------
stable/8/                                                         r267828
releng/8.4/                                                       r267832
stable/9/                                                         r267828
releng/9.1/                                                       r267831
releng/9.2/                                                       r267831
releng/9.3/                                                       r267830
stable/10/                                                        r267828
releng/10.0/                                                      r267829
- - -------------------------------------------------------------------------

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-2012-1571>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-7345>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1943>

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-2270>

The latest revision of this advisory is available at
<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:16.file.asc>
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