______________________________________________________________________________
SuSE Security Announcement
Package: openssh
Announcement-ID: SuSE-SA:2001:044
Date: Mon Dec 3 14:01:19 CET 2001
Affected SuSE versions: 6.4, 7.0, 7.1, 7.2, 7.3
Vulnerability Type: various bugs
Severity (1-10): 4
SuSE default package: yes
Other affected systems: All systems shipping OpenSSH <= 2.9.9
Content of this advisory:
1) security vulnerability resolved: Various problems in OpenSSH.
problem description, discussion, solution and upgrade information
2) pending vulnerabilities, solutions, workarounds
3) standard appendix (further information)
______________________________________________________________________________
1) problem description, brief discussion, solution, upgrade information
The OpenSSH daemon shipped with SuSE distributions contains various minor
bugs which allows bypassing of IP-access control in some circumstances or
the deletion of files named "cookies" if X11 forwarding is enabled.
It has also been verified that the recent remotely exploitable crc32 bug as
well as the logging-bug has been fixed in our latest ssh packages.
We strongly recommend to update to OpenSSH version 2.9.9p2. Please download
and update the packages as described in section 3. Then invoke
/etc/rc.d/sshd restart
to restart the OpenSSH daemon.
If you are logged on via sshd, then it is adviseable to perform the update
in an atjob to make sure that it can be completed if your secure shell
daemon gets killed:
rpm -Uhv openssh-*.rpm
echo "rcsshd restart" | at now
Please note that OpenSSH 2.9.9p2 is *not*
vulnerable to the crc32/deattack exploit. Some people made wrong statements
about that recently and claimed they have found exploits for this version
"in the wild" which exploits the crc32 hole against this version.
This is wrong and you can safely ignore these discussions.
If you installed the ssh-1.2.27 package instead of the openssh package no
updates should be necessary as long as you recognized the SuSE Security
Announcement SuSE-SA:2001:04 which recommends to update to the latest
ssh-1.2.27 packages.
Due to legal constraints, the packages for the 7.0 and older
distributions containing cryptographic code can be found on ftp.suse.de,
not ftp.suse.com. The distribution 7.1 and newer have all of their
update packages on ftp.suse.com.
i386 Intel Platform:
SuSE-7.3
6ba603f1115b0125abf0b62f28ba6666
source rpm:
644d74829ecaa12c6a28cc9564bb0a1c
SuSE-7.2
0b0406a63181bf23c683add3f6f9abc3
source rpm:
5914018a06e77f7477058afa8617ab10
SuSE-7.1
0d69dce8f61317c84efde55f6cc95f10
source rpm:
3aeba61d45d243773db8d1b7eedf6924
SuSE-7.0
2defc4cf8182b1e5eb4b204224007dd6
source rpm:
1999c7c42507c1c4d831daf170e88c6e
SuSE-6.4
5fe6fdee55502e81b383b5b11047cee9
source rpm:
cfee6bebb8086dc2d861aeb5fff6dc17
Sparc Platform:
SuSE-7.1
8dcf46c82f11c35e8812d477caacd3b2
source rpm:
27ed16f77bcabd34919681fa07fcbd1c
SuSE-7.0
a23db0e0516a935cfce8a199a48ce036
source rpm:
e4c6c636fe7dd5e234d89dd28564611b
AXP Alpha Platform:
SuSE-7.1
b0e29b53f247c7a8ba6d17297867730e
source rpm:
73a832a3b10876d751203aca7fd37607
SuSE-7.0
5e07df7ce670e3918f0948495d74e23c
source rpm:
3a26418017f5af49ba707e51fa28d954
SuSE-6.4
c2e7364a00aef31a9d121302d316ce4f
source rpm:
d3a9299f748395912644c375e24302f7
Power PC Platform:
SuSE-7.3
bdab314f57128accaa4855a8aedf23df
source rpm:
840bde44f9b372e637a7bdcf3b11a87e
SuSE-7.1
d3b5f2b85ce6cf9e30a0826127f5b6e4
source rpm:
888e553f06f96ddd7395ad4c241e0b69
SuSE-7.0
34eee0c543d2cf266d084d7262475573
source rpm:
c33d2e38303853e9363ee0beb9889b43
SuSE-6.4
4d00f9e0a85631c3e2dd721ca0784f27
source rpm:
685e7c8f85117384ea1205b683593b47
______________________________________________________________________________
2) Pending vulnerabilities in SuSE Distributions and Workarounds:
No additional information in this announcement.
______________________________________________________________________________
3) standard appendix: authenticity verification, additional information
- Package authenticity verification:
SuSE update packages are available on many mirror ftp servers all over
the world. While this service is being considered valuable and important
to the free and open source software community, many users wish to be
sure about the origin of the package and its content before installing
the package. 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) md5sums as provided in the (cryptographically signed) announcement.
2) using the internal gpg signatures of the rpm package.
1) execute the command
md5sum
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
announcement. Since the announcement containing the checksums is
cryptographically signed (usually using the key security@suse.de),
the checksums show proof of the authenticity of the package.
We disrecommend to subscribe to security lists which cause the
email message containing the announcement to be modified so that
the signature does not match after transport through the mailing
list software.
Downsides: You must be able to verify the authenticity of the
announcement in the first place. If RPM packages are being rebuilt
and a new version of a package is published on the ftp server, all
md5 sums for the files are useless.
2) 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, where is the
filename of the rpm package that you have downloaded. Of course,
package authenticity verification can only target an uninstalled rpm
package file.
Prerequisites:
a) gpg is installed
b) The package is signed using a certain key. The public part of this
key must be installed by the gpg program in the directory
~/.gnupg/ under the user's home directory who performs the
signature verification (usually root). You can import the key
that is used by SuSE in rpm packages for SuSE Linux by saving
this announcement to a file ("announcement.txt") and
running the command (do "su -" to be root):
gpg --batch; gpg < announcement.txt | gpg --import
SuSE Linux distributions version 7.1 and thereafter install the
key "build@suse.de" upon installation or upgrade, provided that
the package gpg is installed. The file containing the public key
is placed at the toplevel directory of the first CD (pubring.gpg)
and at .
- SuSE runs two security mailing lists to which any interested party may
subscribe:
suse-security@suse.com
- general/linux/SuSE security discussion.
All SuSE security announcements are sent to this list.
To subscribe, send an email to
<suse-security-subscribe@suse.com>.
suse-security-announce@suse.com
- SuSE's announce-only mailing list.
Only SuSE's security annoucements are sent to this list.
To subscribe, send an email 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> respectively.
================================================== SuSE's security contact is <security@suse.com>.
The <security@suse.com> 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,
it is desired that the cleartext signature shows proof of the
authenticity of the text.
SuSE GmbH makes 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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