[RHSA-2005:481-01] Low: openssh security update

Thu Jun 2 14:35:00 UTC 2005

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                   Red Hat Security Advisory

Synopsis:          Low: openssh security update
Advisory ID:       RHSA-2005:481-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-481.html
Issue date:        2005-06-02
Updated on:        2005-06-02
Product:           Red Hat Enterprise Linux
CVE Names:         CAN-2004-0175
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1. Summary:

Updated openssh packages that fix a potential security vulnerability and
various other bugs are now available for Red Hat Enterprise Linux 2.1.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. SSH
replaces rlogin and rsh, and provides secure encrypted communications
between two untrusted hosts over an insecure network. X11 connections and
arbitrary TCP/IP ports can also be forwarded over a secure channel. Public
key authentication can be used for "passwordless" access to servers.

The scp protocol allows a server to instruct a client to write to arbitrary
files outside of the current directory. This could potentially cause a
security issue if a user uses scp to copy files from a malicious server.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2004-0175 to this issue.

These updated packages also correct the following bug:

On systems in which direct ssh access for the root user was disabled by
configuration (setting "PermitRootLogin no"), attempts to guess the root
password could be judged as sucessful or unsucessful by observing a delay.

Users of openssh should upgrade to these updated packages, which contain
backported patches to resolve these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. Bug IDs fixed (http://bugzilla.redhat.com/):

146881 - CAN-2004-0175 malicious ssh server can cause scp to write to arbitrary files
146882 - SSH allows attacker to divine root password

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/openssh-3.1p1-18.src.rpm
cbfd591f56a699edc21db98ddbe7f4f0  openssh-3.1p1-18.src.rpm

i386:
f9a4ad5d4502a22246188c193300b05e  openssh-3.1p1-18.i386.rpm
f55b10b912864dd554ed4907e62da0a5  openssh-askpass-3.1p1-18.i386.rpm
eadfcea8a8dec401a5df795bec13c6cd  openssh-askpass-gnome-3.1p1-18.i386.rpm
afe0e8f5dceaa347cbde08277f17c3d2  openssh-clients-3.1p1-18.i386.rpm
b11eb4ff417d5c52e07b6dcc911cffab  openssh-server-3.1p1-18.i386.rpm

ia64:
41edd025b8c1085e0bfe7c0a3a922151  openssh-3.1p1-18.ia64.rpm
f07ea6b9c163aa0a10d9f192d60e5432  openssh-askpass-3.1p1-18.ia64.rpm
84e4947066a71f613b29320c82d2a862  openssh-askpass-gnome-3.1p1-18.ia64.rpm
09351afec720211c67a4694c848dde3d  openssh-clients-3.1p1-18.ia64.rpm
0e0035471647317e577c92c7a8445123  openssh-server-3.1p1-18.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/openssh-3.1p1-18.src.rpm
cbfd591f56a699edc21db98ddbe7f4f0  openssh-3.1p1-18.src.rpm

ia64:
41edd025b8c1085e0bfe7c0a3a922151  openssh-3.1p1-18.ia64.rpm
f07ea6b9c163aa0a10d9f192d60e5432  openssh-askpass-3.1p1-18.ia64.rpm
84e4947066a71f613b29320c82d2a862  openssh-askpass-gnome-3.1p1-18.ia64.rpm
09351afec720211c67a4694c848dde3d  openssh-clients-3.1p1-18.ia64.rpm
0e0035471647317e577c92c7a8445123  openssh-server-3.1p1-18.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/openssh-3.1p1-18.src.rpm
cbfd591f56a699edc21db98ddbe7f4f0  openssh-3.1p1-18.src.rpm

i386:
f9a4ad5d4502a22246188c193300b05e  openssh-3.1p1-18.i386.rpm
f55b10b912864dd554ed4907e62da0a5  openssh-askpass-3.1p1-18.i386.rpm
eadfcea8a8dec401a5df795bec13c6cd  openssh-askpass-gnome-3.1p1-18.i386.rpm
afe0e8f5dceaa347cbde08277f17c3d2  openssh-clients-3.1p1-18.i386.rpm
b11eb4ff417d5c52e07b6dcc911cffab  openssh-server-3.1p1-18.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/openssh-3.1p1-18.src.rpm
cbfd591f56a699edc21db98ddbe7f4f0  openssh-3.1p1-18.src.rpm

i386:
f9a4ad5d4502a22246188c193300b05e  openssh-3.1p1-18.i386.rpm
f55b10b912864dd554ed4907e62da0a5  openssh-askpass-3.1p1-18.i386.rpm
eadfcea8a8dec401a5df795bec13c6cd  openssh-askpass-gnome-3.1p1-18.i386.rpm
afe0e8f5dceaa347cbde08277f17c3d2  openssh-clients-3.1p1-18.i386.rpm
b11eb4ff417d5c52e07b6dcc911cffab  openssh-server-3.1p1-18.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0175

8. Contact:

The Red Hat security contact is <secalert at redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

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