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Red Hat Security Advisory

Synopsis: Critical: openssh security update
Advisory ID: RHSA-2008:0855-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0855.html
Issue date: 2008-08-22
CVE Names: CVE-2007-4752
=====================================================================

1. Summary:

Updated openssh packages are now available for Red Hat Enterprise Linux 4,
Red Hat Enterprise Linux 5, and Red Hat Enterprise Linux 4.5 Extended
Update Support.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux AS version 4.5.z - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux ES version 4.5.z - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation.

Last week Red Hat detected an intrusion on certain of its computer systems
and took immediate action. While the investigation into the intrusion is
on-going, our initial focus was to review and test the distribution
channel we use with our customers, Red Hat Network (RHN) and its associated
security measures. Based on these efforts, we remain highly confident that
our systems and processes prevented the intrusion from compromising RHN or
the content distributed via RHN and accordingly believe that customers who
keep their systems updated using Red Hat Network are not at risk. We are
issuing this alert primarily for those who may obtain Red Hat binary
packages via channels other than those of official Red Hat subscribers.

In connection with the incident, the intruder was able to sign a small
number of OpenSSH packages relating only to Red Hat Enterprise Linux 4
(i386 and x86_64 architectures only) and Red Hat Enterprise Linux 5 (x86_64
architecture only). As a precautionary measure, we are releasing an
updated version of these packages, and have published a list of the
tampered packages and how to detect them at
http://www.redhat.com/security/data/openssh-blacklist.html

To reiterate, our processes and efforts to date indicate that packages
obtained by Red Hat Enterprise Linux subscribers via Red Hat Network are
not at risk.

These packages also fix a low severity flaw in the way ssh handles X11
cookies when creating X11 forwarding connections. When ssh was unable to
create untrusted cookie, ssh used a trusted cookie instead, possibly
allowing the administrative user of a untrusted remote server, or untrusted
application run on the remote server, to gain unintended access to a users
local X server. (CVE-2007-4752)

4. Solution:

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

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

280361 - CVE-2007-4752 openssh falls back to the trusted x11 cookie if generation of an untrusted cookie fails

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/openssh-3.9p1-11.el4_7.src.rpm

i386:
openssh-3.9p1-11.el4_7.i386.rpm
openssh-askpass-3.9p1-11.el4_7.i386.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.i386.rpm
openssh-clients-3.9p1-11.el4_7.i386.rpm
openssh-debuginfo-3.9p1-11.el4_7.i386.rpm
openssh-server-3.9p1-11.el4_7.i386.rpm

ia64:
openssh-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.ia64.rpm
openssh-clients-3.9p1-11.el4_7.ia64.rpm
openssh-debuginfo-3.9p1-11.el4_7.ia64.rpm
openssh-server-3.9p1-11.el4_7.ia64.rpm

ppc:
openssh-3.9p1-11.el4_7.ppc.rpm
openssh-askpass-3.9p1-11.el4_7.ppc.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.ppc.rpm
openssh-clients-3.9p1-11.el4_7.ppc.rpm
openssh-debuginfo-3.9p1-11.el4_7.ppc.rpm
openssh-server-3.9p1-11.el4_7.ppc.rpm

s390:
openssh-3.9p1-11.el4_7.s390.rpm
openssh-askpass-3.9p1-11.el4_7.s390.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.s390.rpm
openssh-clients-3.9p1-11.el4_7.s390.rpm
openssh-debuginfo-3.9p1-11.el4_7.s390.rpm
openssh-server-3.9p1-11.el4_7.s390.rpm

s390x:
openssh-3.9p1-11.el4_7.s390x.rpm
openssh-askpass-3.9p1-11.el4_7.s390x.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.s390x.rpm
openssh-clients-3.9p1-11.el4_7.s390x.rpm
openssh-debuginfo-3.9p1-11.el4_7.s390x.rpm
openssh-server-3.9p1-11.el4_7.s390x.rpm

x86_64:
openssh-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.x86_64.rpm
openssh-clients-3.9p1-11.el4_7.x86_64.rpm
openssh-debuginfo-3.9p1-11.el4_7.x86_64.rpm
openssh-server-3.9p1-11.el4_7.x86_64.rpm

Red Hat Enterprise Linux AS version 4.5.z:

Source:
ftp://updates.redhat.com/enterprise/4AS-4.5.z/en/os/SRPMS/openssh-3.9p1-10.RHEL4.20.src.rpm

i386:
openssh-3.9p1-10.RHEL4.20.i386.rpm
openssh-askpass-3.9p1-10.RHEL4.20.i386.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.i386.rpm
openssh-clients-3.9p1-10.RHEL4.20.i386.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.i386.rpm
openssh-server-3.9p1-10.RHEL4.20.i386.rpm

ia64:
openssh-3.9p1-10.RHEL4.20.ia64.rpm
openssh-askpass-3.9p1-10.RHEL4.20.ia64.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.ia64.rpm
openssh-clients-3.9p1-10.RHEL4.20.ia64.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.ia64.rpm
openssh-server-3.9p1-10.RHEL4.20.ia64.rpm

ppc:
openssh-3.9p1-10.RHEL4.20.ppc.rpm
openssh-askpass-3.9p1-10.RHEL4.20.ppc.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.ppc.rpm
openssh-clients-3.9p1-10.RHEL4.20.ppc.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.ppc.rpm
openssh-server-3.9p1-10.RHEL4.20.ppc.rpm

s390:
openssh-3.9p1-10.RHEL4.20.s390x.rpm
openssh-askpass-3.9p1-10.RHEL4.20.s390x.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.s390x.rpm
openssh-clients-3.9p1-10.RHEL4.20.s390x.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.s390x.rpm
openssh-server-3.9p1-10.RHEL4.20.s390x.rpm

s390x:
openssh-3.9p1-10.RHEL4.20.s390x.rpm
openssh-askpass-3.9p1-10.RHEL4.20.s390x.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.s390x.rpm
openssh-clients-3.9p1-10.RHEL4.20.s390x.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.s390x.rpm
openssh-server-3.9p1-10.RHEL4.20.s390x.rpm

x86_64:
openssh-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-askpass-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-clients-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-server-3.9p1-10.RHEL4.20.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/openssh-3.9p1-11.el4_7.src.rpm

i386:
openssh-3.9p1-11.el4_7.i386.rpm
openssh-askpass-3.9p1-11.el4_7.i386.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.i386.rpm
openssh-clients-3.9p1-11.el4_7.i386.rpm
openssh-debuginfo-3.9p1-11.el4_7.i386.rpm
openssh-server-3.9p1-11.el4_7.i386.rpm

x86_64:
openssh-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.x86_64.rpm
openssh-clients-3.9p1-11.el4_7.x86_64.rpm
openssh-debuginfo-3.9p1-11.el4_7.x86_64.rpm
openssh-server-3.9p1-11.el4_7.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/openssh-3.9p1-11.el4_7.src.rpm

i386:
openssh-3.9p1-11.el4_7.i386.rpm
openssh-askpass-3.9p1-11.el4_7.i386.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.i386.rpm
openssh-clients-3.9p1-11.el4_7.i386.rpm
openssh-debuginfo-3.9p1-11.el4_7.i386.rpm
openssh-server-3.9p1-11.el4_7.i386.rpm

ia64:
openssh-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.ia64.rpm
openssh-clients-3.9p1-11.el4_7.ia64.rpm
openssh-debuginfo-3.9p1-11.el4_7.ia64.rpm
openssh-server-3.9p1-11.el4_7.ia64.rpm

x86_64:
openssh-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.x86_64.rpm
openssh-clients-3.9p1-11.el4_7.x86_64.rpm
openssh-debuginfo-3.9p1-11.el4_7.x86_64.rpm
openssh-server-3.9p1-11.el4_7.x86_64.rpm

Red Hat Enterprise Linux ES version 4.5.z:

Source:
ftp://updates.redhat.com/enterprise/4ES-4.5.z/en/os/SRPMS/openssh-3.9p1-10.RHEL4.20.src.rpm

i386:
openssh-3.9p1-10.RHEL4.20.i386.rpm
openssh-askpass-3.9p1-10.RHEL4.20.i386.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.i386.rpm
openssh-clients-3.9p1-10.RHEL4.20.i386.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.i386.rpm
openssh-server-3.9p1-10.RHEL4.20.i386.rpm

ia64:
openssh-3.9p1-10.RHEL4.20.ia64.rpm
openssh-askpass-3.9p1-10.RHEL4.20.ia64.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.ia64.rpm
openssh-clients-3.9p1-10.RHEL4.20.ia64.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.ia64.rpm
openssh-server-3.9p1-10.RHEL4.20.ia64.rpm

x86_64:
openssh-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-askpass-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-askpass-gnome-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-clients-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-debuginfo-3.9p1-10.RHEL4.20.x86_64.rpm
openssh-server-3.9p1-10.RHEL4.20.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/openssh-3.9p1-11.el4_7.src.rpm

i386:
openssh-3.9p1-11.el4_7.i386.rpm
openssh-askpass-3.9p1-11.el4_7.i386.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.i386.rpm
openssh-clients-3.9p1-11.el4_7.i386.rpm
openssh-debuginfo-3.9p1-11.el4_7.i386.rpm
openssh-server-3.9p1-11.el4_7.i386.rpm

ia64:
openssh-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-3.9p1-11.el4_7.ia64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.ia64.rpm
openssh-clients-3.9p1-11.el4_7.ia64.rpm
openssh-debuginfo-3.9p1-11.el4_7.ia64.rpm
openssh-server-3.9p1-11.el4_7.ia64.rpm

x86_64:
openssh-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-3.9p1-11.el4_7.x86_64.rpm
openssh-askpass-gnome-3.9p1-11.el4_7.x86_64.rpm
openssh-clients-3.9p1-11.el4_7.x86_64.rpm
openssh-debuginfo-3.9p1-11.el4_7.x86_64.rpm
openssh-server-3.9p1-11.el4_7.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/openssh-4.3p2-26.el5_2.1.src.rpm

i386:
openssh-4.3p2-26.el5_2.1.i386.rpm
openssh-askpass-4.3p2-26.el5_2.1.i386.rpm
openssh-clients-4.3p2-26.el5_2.1.i386.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.i386.rpm
openssh-server-4.3p2-26.el5_2.1.i386.rpm

x86_64:
openssh-4.3p2-26.el5_2.1.x86_64.rpm
openssh-askpass-4.3p2-26.el5_2.1.x86_64.rpm
openssh-clients-4.3p2-26.el5_2.1.x86_64.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.x86_64.rpm
openssh-server-4.3p2-26.el5_2.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/openssh-4.3p2-26.el5_2.1.src.rpm

i386:
openssh-4.3p2-26.el5_2.1.i386.rpm
openssh-askpass-4.3p2-26.el5_2.1.i386.rpm
openssh-clients-4.3p2-26.el5_2.1.i386.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.i386.rpm
openssh-server-4.3p2-26.el5_2.1.i386.rpm

ia64:
openssh-4.3p2-26.el5_2.1.ia64.rpm
openssh-askpass-4.3p2-26.el5_2.1.ia64.rpm
openssh-clients-4.3p2-26.el5_2.1.ia64.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.ia64.rpm
openssh-server-4.3p2-26.el5_2.1.ia64.rpm

ppc:
openssh-4.3p2-26.el5_2.1.ppc.rpm
openssh-askpass-4.3p2-26.el5_2.1.ppc.rpm
openssh-clients-4.3p2-26.el5_2.1.ppc.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.ppc.rpm
openssh-server-4.3p2-26.el5_2.1.ppc.rpm

s390x:
openssh-4.3p2-26.el5_2.1.s390x.rpm
openssh-askpass-4.3p2-26.el5_2.1.s390x.rpm
openssh-clients-4.3p2-26.el5_2.1.s390x.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.s390x.rpm
openssh-server-4.3p2-26.el5_2.1.s390x.rpm

x86_64:
openssh-4.3p2-26.el5_2.1.x86_64.rpm
openssh-askpass-4.3p2-26.el5_2.1.x86_64.rpm
openssh-clients-4.3p2-26.el5_2.1.x86_64.rpm
openssh-debuginfo-4.3p2-26.el5_2.1.x86_64.rpm
openssh-server-4.3p2-26.el5_2.1.x86_64.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=CVE-2007-4752
http://www.redhat.com/security/data/openssh-blacklist.html
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2008 Red Hat, Inc.
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