SUSE Security Announcement: gzip (SUSE-SA:2006:056)
Posted on: 09/26/2006 02:45 PM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: gzip
Announcement ID: SUSE-SA:2006:056
Date: Tue, 26 Sep 2006 15:32:33 +0000
Affected Products: SLE SDK 10
SUSE LINUX 10.1
SUSE LINUX 10.0
SUSE LINUX 9.3
SUSE LINUX 9.2
SuSE Linux Desktop 1.0
SuSE Linux Enterprise Server 8
SUSE SLES 10
SUSE SLES 9
UnitedLinux 1.0
Vulnerability Type: remote system compromise
Severity (1-10): 6
SUSE Default Package: yes
Cross-References: CVE-2006-4334,CVE-2006-4335,CVE-2006-4336,
CVE-2006-4337,CVE-2006-4338

Content of This Advisory:
1) Security Vulnerability Resolved:
buffer overflows, infinite loops
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
none
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

The gzip tool does not handle some specific values correctly when unpacking
archives. This leads to vulnerabilities like buffer overflows or infinite
loops.

Various different programs like mail clients, file explorer, etc. use gzip
and if a user can be deveived to unpack the archive of an attacker these
bugs can lead to remote system compromise.

Thanks to Tavis Ormandy, Google Security Team for informing us about this
issue.

2) Solution or Work-Around

The is no work-around known.

3) Special Instructions and Notes

none

4) Package Location and Checksums

The preferred method for installing security updates is to use the YaST
Online Update (YOU) tool. YOU detects which updates are required and
automatically performs the necessary steps to verify and install them.
Alternatively, download the update packages for your distribution manually
and verify their integrity by the methods listed in Section 6 of this
announcement. Then install the packages using the command

rpm -Fhv <file.rpm>

to apply the update, replacing <file.rpm> with the filename of the
downloaded RPM package.


x86 Platform:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/gzip-1.3.5-159.5.i586.rpm
dc3d0d1fa04f309155188d456339e320

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/gzip-1.3.5-144.2.i586.rpm
fa214e77cac58482b03a39aa3637402f

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/gzip-1.3.5-140.2.i586.rpm
93c268c56d6f2bfb97fb1362440619ff

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/gzip-1.3.5-139.2.i586.rpm
9ce8e3d5dda60f5c0226e1003555e7e3

Power PC Platform:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/gzip-1.3.5-159.5.ppc.rpm
e5216ebf301cc076117d24b1d641d666

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/gzip-1.3.5-144.2.ppc.rpm
70fad9dec1124d6e2a18cddb56542e21

x86-64 Platform:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/gzip-1.3.5-159.5.x86_64.rpm
bc88120404ee14a4f85869bf7b664c23

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/gzip-1.3.5-144.2.x86_64.rpm
9bac8a94f263b70fcb0188b8fe61b51a

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/gzip-1.3.5-140.2.x86_64.rpm
e99894cc66b479b026a8d6ab8f3d4bee

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/gzip-1.3.5-139.2.x86_64.rpm
7f58b2c8124e895b5bbbf24e92f5701a

Sources:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/gzip-1.3.5-159.5.src.rpm
ccc806bead84a51395e24d03e1b08132

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/gzip-1.3.5-144.2.src.rpm
8d38b0719a591ac7c41aa35062ca8f2e

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/gzip-1.3.5-140.2.src.rpm
1c7511c702371171e4a940e6c6740c35

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/gzip-1.3.5-139.2.src.rpm
81243003d7d3b397d7043a74059c5d7f

Our maintenance customers are notified individually. The packages are
offered for installation from the maintenance web:

http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/c9a04465aadc28a00f8e67df4a55f059.html

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

none
______________________________________________________________________________

6) Authenticity Verification and Additional Information

- Announcement authenticity verification:

SUSE security announcements are published via mailing lists and on Web
sites. The authenticity and integrity of a SUSE security announcement is
guaranteed by a cryptographic signature in each announcement. All SUSE
security announcements are published with a valid signature.

To verify the signature of the announcement, save it as text into a file
and run the command

gpg --verify <file>

replacing <file> with the name of the file where you saved the
announcement. The output for a valid signature looks like:

gpg: Signature made <DATE> using RSA key ID 3D25D3D9
gpg: Good signature from "SuSE Security Team <security@suse.de>"

where <DATE> is replaced by the date the document was signed.

If the security team's key is not contained in your key ring, you can
import it from the first installation CD. To import the key, use the
command

gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

- Package authenticity verification:

SUSE update packages are available on many mirror FTP servers all over the
world. While this service is considered valuable and important to the free
and open source software community, the authenticity and the integrity of
a package needs to be verified to ensure that it has not been tampered
with.

There are two verification methods that can be used independently from
each other to prove the authenticity of a downloaded file or RPM package:

1) Using the internal gpg signatures of the rpm package
2) MD5 checksums as provided in this announcement

1) The internal rpm package signatures provide an easy way to verify the
authenticity of an RPM package. Use the command

rpm -v --checksig <file.rpm>

to verify the signature of the package, replacing <file.rpm> with the
filename of the RPM package downloaded. The package is unmodified if it
contains a valid signature from build@suse.de with the key ID 9C800ACA.

This key is automatically imported into the RPM database (on
RPMv4-based distributions) and the gpg key ring of 'root' during
installation. You can also find it on the first installation CD and at
the end of this announcement.

2) If you need an alternative means of verification, use the md5sum
command to verify the authenticity of the packages. Execute the command

md5sum <filename.rpm>

after you downloaded the file from a SUSE FTP server or its mirrors.
Then compare the resulting md5sum with the one that is listed in the
SUSE security announcement. Because the announcement containing the
checksums is cryptographically signed (by security@suse.de), the
checksums show proof of the authenticity of the package if the
signature of the announcement is valid. Note that the md5 sums
published in the SUSE Security Announcements are valid for the
respective packages only. Newer versions of these packages cannot be
verified.

- SUSE runs two security mailing lists to which any interested party may
subscribe:

suse-security@suse.com
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
<suse-security-subscribe@suse.com>.

suse-security-announce@suse.com
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an e-mail to
<suse-security-announce-subscribe@suse.com>.

For general information or the frequently asked questions (FAQ),
send mail to <suse-security-info@suse.com> or
<suse-security-faq@suse.com>.

=====================================================================
SUSE's security contact is <security@suse.com> or <security@suse.de>.
The <security@suse.de> public key is listed below.
=====================================================================
______________________________________________________________________________

The information in this advisory may be distributed or reproduced,
provided that the advisory is not modified in any way. In particular, the
clear text signature should show proof of the authenticity of the text.

SUSE Linux Products GmbH provides no warranties of any kind whatsoever
with respect to the information contained in this security advisory.

Type Bits/KeyID Date User ID
pub 2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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