SUSE Security Announcement: cyrus-sasl-digestmd5 denial of service attack (SUSE-SA:2006:025)
Posted on: 05/05/2006 03:22 PM

A security announcement from SUSE

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______________________________________________________________________________

SUSE Security Announcement

Package: cyrus-sasl-digestmd5
Announcement ID: SUSE-SA:2006:025
Date: Fri, 05 May 2006 13:00:00 +0000
Affected Products: SUSE LINUX 9.3
SUSE LINUX 9.2
SUSE LINUX 9.1
SUSE SLES 9
Vulnerability Type: remote denial of service
Severity (1-10): 5
SUSE Default Package: yes
Cross-References: CVE-2006-1721, CVE-2006-1905

Content of This Advisory:
1) Security Vulnerability Resolved:
remote denial of service against cyrus-sasl using programs
Problem Description
2) Solution or Work-Around
3) Special Instructions and Notes
4) Package Location and Checksums
5) Pending Vulnerabilities, Solutions, and Work-Arounds:
- xine-ui format string problems
- clamav buffer overflow
- mysql various issues
- next kernel update
- ethereal various problems
6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

If a server or client is using DIGEST-MD5 authentication via the cyrus-sasl
libraries it is possible to cause a denial of service attack against the other
side (client or server) by leaving out the "realm=" header in the authentication.

This is tracked by the Mitre CVE ID CVE-2006-1721.
2) Solution or Work-Around

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

3) Special Instructions and Notes

Please restart the services using cyrus-sasl (cyrus-imapd is one of those).

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 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/cyrus-sasl-digestmd5-2.1.20-7.2.i586.rpm
7ae81695233f202a12f4c5c7d819302e

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/cyrus-sasl-digestmd5-2.1.19-7.4.i586.rpm
f91978bbd48c77c768aa5ddadc84ce3e

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/cyrus-sasl-digestmd5-2.1.18-33.11.i586.rpm
080a9846ce3ce42cbfde6d1159e3cebc

x86-64 Platform:

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/cyrus-sasl-digestmd5-2.1.20-7.2.x86_64.rpm
d2ec2cde79e08f20bff8b248cee64f48

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/cyrus-sasl-digestmd5-2.1.19-7.4.x86_64.rpm
77d305e731f06d7022bebb616ab85406

SUSE LINUX 9.1:
ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/cyrus-sasl-digestmd5-2.1.18-33.11.x86_64.rpm
cb6967a053f3672107ca83c7e81d6903

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

SUSE SLES 9
http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/35452cb6896bec388d5e441a772fd24f.html

______________________________________________________________________________

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

- xine-ui format string problems
xine-ui has been updated to fix multiple format string bugs in the
file name processing code of playlists that could potentially be
exploited to execute arbitrary code (CVE-2006-1905).

- clamav buffer overflow
A clamav update to version 0.88.2 is in preparation, which fixes
among other things the following security problem:

- A buffer overflow in the freshclam program might allow remote web
servers to execute arbitrary code via long HTTP headers
(CVE-2006-1989).

All SUSE Linux based products containing clamav are affected by
these problems.

- mysql various issues
MySQL 5.0.21 was released fixing various security problems, including
information leaks and a remote code execution.

We are currently preparing updates for these problems.

- next kernel update
We are currently preparing a kernel update, collecting issues found
in the last 3 months. The current schedule projects a release near
end of may.

All SUSE Linux based products will receive those updates.

- ethereal various problems
Various ethereal problems have been identified and fixed in the
newest ethereal release. We are preparing updates for these problems.

All SUSE Linux versions are affected.
______________________________________________________________________________

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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