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Category:   Application (Generic)  >   Gzip Vendors:   GNU [multiple authors]
(FreeBSD Issues Fix) Gzip Bugs in Expanding Archives Let Remote Users Cause Denial of Service Conditions or Arbitrary Code Execution
SecurityTracker Alert ID:  1016885
SecurityTracker URL:  http://securitytracker.com/id/1016885
CVE Reference:   CVE-2006-4334, CVE-2006-4335, CVE-2006-4336, CVE-2006-4337, CVE-2006-4338   (Links to External Site)
Date:  Sep 19 2006
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.2.4
Description:   A vulnerability was reported in Gzip. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted archive that, when expanded by the target user or application, will trigger a buffer overflow and execute arbitrary code on the target system. The code will run with the privileges of the target user or application.

A specially crafted archive can also trigger a NULL pointer dereference or cause gzip to enter an infinite loop.

Tavis Ormandy of the Google Security Team discovered these vulnerabilities.

Impact:   A remote user can create an archive that, when processed by the target user or application, will execute arbitrary code on the target system or cause gzip to crash or hang.
Solution:   FreeBSD has released a fix and has provided the following solution information [quoted]:

Perform one of the following:

1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, RELENG_5_3,
or RELENG_4_11 security branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 4.11, 5.3,
5.4, 5.5, 6.0, and 6.1 systems.

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

# fetch http://security.FreeBSD.org/patches/SA-06:21/gzip.patch
# fetch http://security.FreeBSD.org/patches/SA-06:21/gzip.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/gnu/usr.bin/gzip
# make obj && make depend && make && make install

The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-06:21.gzip.asc

Vendor URL:  www.gzip.org/ (Links to External Site)
Cause:   Boundary error, State error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  6.2 and prior versions

Message History:   This archive entry is a follow-up to the message listed below.
Sep 19 2006 Gzip Bugs in Expanding Archives Let Remote Users Cause Denial of Service Conditions or Arbitrary Code Execution



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-06:21.gzip


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

=============================================================================
FreeBSD-SA-06:21.gzip                                       Security Advisory
                                                          The FreeBSD Project

Topic:          Multiple vulnerabilities in gzip

Category:       contrib
Module:         gzip
Announced:      2006-09-19
Credits:        Tavis Ormandy, Google Security Team
Affects:        All FreeBSD releases.
Corrected:      2006-09-19 14:02:30 UTC (RELENG_6, 6.2-PRERELEASE)
                2006-09-19 14:03:26 UTC (RELENG_6_1, 6.1-RELEASE-p7)
                2006-09-19 14:04:13 UTC (RELENG_6_0, 6.0-RELEASE-p12)
                2006-09-19 14:06:21 UTC (RELENG_5, 5.5-STABLE)
                2006-09-19 14:07:13 UTC (RELENG_5_5, 5.5-RELEASE-p5)
                2006-09-19 14:08:10 UTC (RELENG_5_4, 5.4-RELEASE-p19)
                2006-09-19 14:09:09 UTC (RELENG_5_3, 5.3-RELEASE-p34)
                2006-09-19 14:11:35 UTC (RELENG_4, 4.11-STABLE)
                2006-09-19 14:13:53 UTC (RELENG_4_11, 4.11-RELEASE-p22)
CVE Name:       CVE-2006-4334, CVE-2006-4335, CVE-2006-4336, CVE-2006-4337,
                CVE-2006-4338

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

gzip is a file compression utility.

II.  Problem Description

Multiple programming errors have been found in gzip which can be
triggered when gzip is decompressing files.  These errors include
insufficient bounds checks in buffer use, a NULL pointer dereference,
and a potential infinite loop.

III. Impact

The insufficient bounds checks in buffer use can cause gzip to crash,
and may permit the execution of arbitrary code.  The NULL pointer
deference can cause gzip to crash.  The infinite loop can cause a
Denial-of-Service situation where gzip uses all available CPU time.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, RELENG_5_4, RELENG_5_3,
or RELENG_4_11 security branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 4.11, 5.3,
5.4, 5.5, 6.0, and 6.1 systems.

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

# fetch http://security.FreeBSD.org/patches/SA-06:21/gzip.patch
# fetch http://security.FreeBSD.org/patches/SA-06:21/gzip.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/gnu/usr.bin/gzip
# 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_4
  src/gnu/usr.bin/gzip/gzip.h                                    1.3.12.1
  src/gnu/usr.bin/gzip/inflate.c                                  1.8.2.2
  src/gnu/usr.bin/gzip/unlzh.c                                    1.5.2.1
  src/gnu/usr.bin/gzip/unpack.c                                   1.6.2.1
RELENG_4_11
  src/UPDATING                                             1.73.2.91.2.23
  src/sys/conf/newvers.sh                                  1.44.2.39.2.26
  src/gnu/usr.bin/gzip/gzip.h                                    1.3.36.1
  src/gnu/usr.bin/gzip/inflate.c                              1.8.2.1.2.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.30.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.30.1
RELENG_5
  src/gnu/usr.bin/gzip/gzip.h                                     1.4.2.1
  src/gnu/usr.bin/gzip/inflate.c                                  1.9.2.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.26.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.26.1
RELENG_5_5
  src/UPDATING                                             1.342.2.35.2.5
  src/sys/conf/newvers.sh                                   1.62.2.21.2.7
  src/gnu/usr.bin/gzip/gzip.h                                    1.4.14.1
  src/gnu/usr.bin/gzip/inflate.c                                 1.9.14.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.40.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.40.1
RELENG_5_4
  src/UPDATING                                            1.342.2.24.2.28
  src/sys/conf/newvers.sh                                  1.62.2.18.2.24
  src/gnu/usr.bin/gzip/gzip.h                                     1.4.6.1
  src/gnu/usr.bin/gzip/inflate.c                                  1.9.6.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.32.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.32.1
RELENG_5_3
  src/UPDATING                                            1.342.2.13.2.37
  src/sys/conf/newvers.sh                                  1.62.2.15.2.39
  src/gnu/usr.bin/gzip/gzip.h                                     1.4.4.1
  src/gnu/usr.bin/gzip/inflate.c                                  1.9.4.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.28.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.28.1
RELENG_6
  src/gnu/usr.bin/gzip/gzip.h                                     1.4.8.1
  src/gnu/usr.bin/gzip/inflate.c                                  1.9.8.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.34.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.34.1
RELENG_6_1
  src/UPDATING                                             1.416.2.22.2.9
  src/sys/conf/newvers.sh                                   1.69.2.11.2.9
  src/gnu/usr.bin/gzip/gzip.h                                    1.4.12.1
  src/gnu/usr.bin/gzip/inflate.c                                 1.9.12.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.38.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.38.1
RELENG_6_0
  src/UPDATING                                             1.416.2.3.2.17
  src/sys/conf/newvers.sh                                   1.69.2.8.2.13
  src/gnu/usr.bin/gzip/gzip.h                                    1.4.10.1
  src/gnu/usr.bin/gzip/inflate.c                                 1.9.10.1
  src/gnu/usr.bin/gzip/unlzh.c                                   1.5.36.1
  src/gnu/usr.bin/gzip/unpack.c                                  1.6.36.1
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4334
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4335
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4336
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4337
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4338

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:21.gzip.asc
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