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______________________________________________________________________________

SUSE Security Announcement

Package: openssh
Announcement ID: SUSE-SA:2006:062
Date: Fri, 20 Oct 2006 17:00:00 +0000
Affected Products: Novell Linux Desktop 9
Novell Linux POS 9
Open Enterprise Server
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 Linux Openexchange Server 4
SUSE LINUX Retail Solution 8
SuSE Linux School Server
SuSE Linux Standard Server 8
SUSE SLED 10
SUSE SLES 10
SUSE SLES 9
UnitedLinux 1.0
Vulnerability Type: remote denial of service
Severity (1-10): 7
SUSE Default Package: yes
Cross-References: CVE-2006-4924, CVE-2006-4925, CVE-2006-5051
CVE-2006-5052

Content of This Advisory:
1) Security Vulnerability Resolved:
various openssh security problems fixed in openssh 4.4
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

Several security problems were fixed in OpenSSH 4.4 and the bug fixes were
back ported to the openssh versions in our products.

- CVE-2006-4924: A denial of service problem has been fixed in OpenSSH which could
be used to cause lots of CPU consumption on a remote openssh server.

- CVE-2006-4925: If a remote attacker is able to inject network traffic this could
be used to cause a client connection to close.

- CVE-2006-5051: Fixed an unsafe signal handler reported by Mark Dowd. The signal
handler was vulnerable to a race condition that could be exploited to perform a
pre-authentication denial of service. This vulnerability could theoretically lead to
pre-authentication remote code execution if GSSAPI authentication is enabled,
but the likelihood of successful exploitation appears remote.

- CVE-2006-5052: Fixed a GSSAPI authentication abort that could be used to determine
the validity of user names on some platforms.


2) Solution or Work-Around

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

3) Special Instructions and Notes

On SUSE Linux Enterprise Server 8, please close and restart the sshd service after
installing this update.

All other products do this automatically during installation, there
is no action necessary.

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/openssh-4.2p1-18.9.i586.rpm
255c99f43b24995a085ac869082d0f32
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/openssh-askpass-4.2p1-18.9.i586.rpm
ab68460091ac8995290a3476b5b8dbeb

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/openssh-4.1p1-10.9.i586.rpm
dd3d6f3700e9e84294cf157c3a3141c1
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/openssh-askpass-4.1p1-10.9.i586.rpm
89c7e004bb73629eac71ad642e8826d2

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/openssh-3.9p1-12.8.i586.rpm
dc57b898b4f43645c2fe18b58195de90
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/openssh-askpass-3.9p1-12.8.i586.rpm
cf7b7c04fc9e27684aa97206cd3ae0e0

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/openssh-3.9p1-3.10.i586.rpm
e54678b3168c214400c30001c33f3d2d
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/openssh-askpass-3.9p1-3.10.i586.rpm
200b096a9a37b183c7ef75ae0b5b0b0c

Power PC Platform:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/openssh-4.2p1-18.9.ppc.rpm
f02d12d3ce4e303676efb1cf37d26b11
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/openssh-askpass-4.2p1-18.9.ppc.rpm
b577d22c8914b0cd36eb6187e9de6dfc

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/openssh-4.1p1-10.9.ppc.rpm
3bd330de35c5e59775883e541af6aa91
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/openssh-askpass-4.1p1-10.9.ppc.rpm
04ea40beed9130fb5f11eda80b248f31

x86-64 Platform:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/openssh-4.2p1-18.9.x86_64.rpm
55f9631c5a7a10f3a7d56016cabe3908
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/openssh-askpass-4.2p1-18.9.x86_64.rpm
f6c77143b56d82e78701db5b56a481d1

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/openssh-4.1p1-10.9.x86_64.rpm
32a2412b4f35461f530f73c95b5e85c2
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/openssh-askpass-4.1p1-10.9.x86_64.rpm
0d89fa02d44e4ca99e237e3812fd4577

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/openssh-3.9p1-12.8.x86_64.rpm
cf96c984dffb0c10ac339d917e8ef97d
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/openssh-askpass-3.9p1-12.8.x86_64.rpm
9012087ea4c163b784178a3a7b22d44c

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/openssh-3.9p1-3.10.x86_64.rpm
7e004fedc5ff48a3c13a22d5cc1c2ab4
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/openssh-askpass-3.9p1-3.10.x86_64.rpm
78278ce560a5ea87e1a4cf80126712c3

Sources:

SUSE LINUX 10.1:
ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/openssh-4.2p1-18.9.src.rpm
79f1eb2463e7638789c79ca62d158bea

SUSE LINUX 10.0:
ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/openssh-4.1p1-10.9.src.rpm
023b6d8056ad3dfec1357548d7b8a5ed

SUSE LINUX 9.3:
ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/openssh-3.9p1-12.8.src.rpm
fb5bd0e14208b1434313669fe01e8f07

SUSE LINUX 9.2:
ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/openssh-3.9p1-3.10.src.rpm
c2bc3328b87cc77172b1185d364a8116

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

UnitedLinux 1.0
SuSE Linux Openexchange Server 4
Open Enterprise Server
Novell Linux POS 9
Novell Linux Desktop 9
SuSE Linux Enterprise Server 8
SuSE Linux Standard Server 8
SuSE Linux School Server
SUSE LINUX Retail Solution 8
SuSE Linux Desktop 1.0
SUSE SLES 10
SUSE SLED 10
SUSE SLES 9
http://support.novell.com/techcenter/psdb/05412985c36daeff0c33b88942b68c2c.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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