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______________________________________________________________________________
SUSE Security Announcement
Package: libxcrypt
Announcement ID: SUSE-SA:2008:036
Date: Mon, 21 Jul 2008 11:00:00 +0000
Affected Products: openSUSE 11.0
Vulnerability Type: use of weak password hash algorithm
Severity (1-10): 4
SUSE Default Package: yes
Cross-References: CVE-2008-3188
Content of This Advisory:
1) Security Vulnerability Resolved:
libxcrypt uses DES as hash algorithm instead of MD5
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
libxcrypt is used on openSUSE to calculate the hash value of
passwords. It can be configured to use DES, MD5 or blowfish. Due to
a bug in libxcrypt the DES algorithm was used if MD5 was configured
in /etc/default/passwd. The default algorithm used on openSUSE is
blowfish which worked as expected though.
2) Solution or Work-Around
There is no known workaround, please install the update packages.
3) Special Instructions and Notes
After applying the update you need to set the password again for all
accounts that are supposed to have an MD5 password hash.
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
to apply the update, replacing with the filename of the
downloaded RPM package.
x86 Platform:
openSUSE 11.0:
http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/libxcrypt-3.0...
http://download.opensuse.org/pub/opensuse/update/11.0/rpm/i586/libxcrypt-dev...
x86-64 Platform:
openSUSE 11.0:
http://download.opensuse.org/pub/opensuse/update/11.0/rpm/x86_64/libxcrypt-3...
Sources:
openSUSE 11.0:
http://download.opensuse.org/pub/opensuse/update/11.0/rpm/src/libxcrypt-3.0-...
______________________________________________________________________________
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 "
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.
The internal rpm package signatures provide an easy way to verify the
authenticity of an RPM package. Use the command
rpm -v --checksig
to verify the signature of the package, replacing 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.
- SUSE runs two security mailing lists to which any interested party may
subscribe:
opensuse-security@opensuse.org
- General Linux and SUSE security discussion.
All SUSE security announcements are sent to this list.
To subscribe, send an e-mail to
.
opensuse-security-announce@opensuse.org
- SUSE's announce-only mailing list.
Only SUSE's security announcements are sent to this list.
To subscribe, send an e-mail to
.
=====================================================================
SUSE's security contact is or .
The 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
pub 1024D/9C800ACA 2000-10-19 SuSE Package Signing Key
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