SUSE Security Announcement: gpg,liby2util signature checking problems (SUSE-SA:2006:013)
Posted on: 03/01/2006 10:32 AM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: gpg,liby2util
Announcement ID: SUSE-SA:2006:013
Date: Wed, 01 Mar 2006 11:00:00 +0000
Affected Products: SUSE LINUX 10.0
SUSE LINUX 9.3
SUSE LINUX 9.2
SUSE LINUX 9.1
SuSE Linux Desktop 1.0
SuSE Linux Enterprise Server 8
SUSE LINUX Enterprise Server 9
UnitedLinux 1.0
Open Enterprise Server 1
Novell Linux Desktop 9
Vulnerability Type: remote code execution
Severity (1-10): 9
SUSE Default Package: yes
Cross-References: CVE-2006-0455, CVE-2006-0803

Content of This Advisory:
1) Security Vulnerability Resolved:
gpg signature checking problems
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
See SUSE Security Summary Report.
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

This is a reissue of SUSE-SA:2006:009, after we found out that also
gpg version < 1.4.x are affected by the signature checking problem
of CVE-2006-0455.

With certain handcraft-able signatures GPG was returning a 0 (valid
signature) when used on command-line with option --verify.

This could make automated checkers, like for instance the patch file
verification checker of the YaST Online Update, pass malicious patch
files as correct and allow remote code execution.

This is tracked by the Mitre CVE ID CVE-2006-0455.

Also, the YaST Online Update script signature verification had used a
feature which was not meant to be used for signature verification,
making it possible to supply any kind of script which would be
considered correct. This would also allow code execution.

This issue is tracked by the Mitre CVE ID CVE-2006-0803.

Both attacks require an attacker either manipulating a YaST Online
Update mirror or manipulating the network traffic between the mirror
and your machine.

2) Solution or Work-Around

There is no known workaround, please install the update packages.

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 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-2.12.9-0.4.i586.rpm
91697f9207b20931d669f9f6d085b816
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-devel-2.12.9-0.4.i586.rpm
c6815c8ff1cc695f91cf9c1ba6960554

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-2.11.7-0.3.i586.rpm
a321ab146d07c50cc69a91352ac28bf7
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-devel-2.11.7-0.3.i586.rpm
1215bcf8f061079dbe05b93b1d611818

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/gpg-1.2.5-3.4.i586.rpm
3df19ea2069732c17da1b150d76fdba1
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/liby2util-2.10.7-0.3.i586.rpm
ab21dd4a8f561abba2cd5b25e3076e41
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/liby2util-devel-2.10.7-0.3.i586.rpm
e1b45fbf2b326e7a4d06d1fa23100415

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/gpg-1.2.4-68.10.i586.rpm
5ea37344f72e28ff06f40976081e6499
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/liby2util-2.9.27-0.7.i586.rpm
dcdaf21f345b2d4ffa55a78c74625633
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/liby2util-devel-2.9.27-0.7.i586.rpm
18624f647f80b9e39a8c910c90d60c87

Power PC Platform:

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-2.12.9-0.4.ppc.rpm
584b0cc0fadc160148b98976cbb9abb8
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-devel-2.12.9-0.4.ppc.rpm
dcc926d75e15cda7c83e6ab110defd1f

x86-64 Platform:

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-2.12.9-0.4.x86_64.rpm
712892d9238ad5ae230837f89528a4c1
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-devel-2.12.9-0.4.x86_64.rpm
ea0e06b186f3ffe7df066888b69e64fe

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-2.11.7-0.3.x86_64.rpm
7cd1425a429b4637b34aa675d4eeaa85
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-devel-2.11.7-0.3.x86_64.rpm
8d27157261b70a5bb51ab643d8dd1fe8

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/gpg-1.2.5-3.4.x86_64.rpm
9e0fb9977027d7b95006ac6405a1befc
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/liby2util-2.10.7-0.3.x86_64.rpm
b33ebf6703546c56ec10eea205e4fbd8
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/liby2util-devel-2.10.7-0.3.x86_64.rpm
6b385cd9d0902eeede67267933248404

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/gpg-1.2.4-68.10.x86_64.rpm
d05a99f75d4089a56b2f21c2b7aca67a
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/liby2util-2.9.27-0.7.x86_64.rpm
d1c2276f502d6ad34940d1f2b907890d
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/liby2util-devel-2.9.27-0.7.x86_64.rpm
d74648e8c92952b1c9fdb4796f3d360e

Sources:

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/liby2util-2.12.9-0.4.src.rpm
e1f57563afd30bb0252494a010d3c0c0

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/liby2util-2.11.7-0.3.src.rpm
2663aecb5e77147aca6881bd92e570bb

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/gpg-1.2.5-3.4.src.rpm
9415d5fefce7c12bd381d03255ec02f1
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/liby2util-2.10.7-0.3.src.rpm
9e6d935a4c540a5de5ff2681ee8281f1

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/gpg-1.2.4-68.10.src.rpm
4147426d68077823fa808905e10478bf
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/liby2util-2.9.27-0.7.src.rpm
f4d1da1c13fd712999a87f7736eec2eb
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/gpg-1.2.4-68.10.src.rpm
c3ee5b82f7bb056082b3402d59b1eaed
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/liby2util-2.9.27-0.7.src.rpm
3dc3eea2b078aa1222875ad8abd09260

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/3b6c0c5ac07d0c820d800216e3ed2240.html
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/76efde0032721703f2b0b1d8a15c440c.html
______________________________________________________________________________

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

See SUSE Security Summary Report.
______________________________________________________________________________

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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