Date: Tue, 21 Nov 2000 16:39 -0500
From: bugzilla@redhat.com
To: redhat-watch-list@redhat.com
Subject: [RHSA-2000:111-03] Updated openssh packages available for
Red Hat Linux 7
Red Hat, Inc. Security Advisory
Synopsis: Updated openssh packages available for Red Hat Linux 7
Advisory ID: RHSA-2000:111-03
Issue date: 2000-11-20
Updated on: 2000-11-21
Product: Red Hat Linux
Keywords: openssh malicious server port forwarding
Cross references: N/A
1. Topic:
Updated openssh packages are now available for Red Hat Linux
7.
2. Relevant releases/architectures:
Red Hat Linux 7.0 – i386
Red Hat Linux 7.0J – i386
3. Problem description:
An OpenSSH client will do agent or X11 forwarding at the request
of a server, even if the user has not requested that it be done. A
malicious server can exploit this vulnerability to gain access to
the user’s display.
4. Solution:
For each RPM for your particular architecture, run:
rpm -Fvh [filename]
where filename is the name of the RPM.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla
for more info):
18598 – ssh-keygen -l does not work for dsa keys
20805 – Hostile servers can force OpenSSH clients to do agent or
X11 forwarding
20884 – openssh-2.3.0p1 doesn’t include /etc/ssh/primes
6. RPMs required:
Red Hat Linux 7.0:
i386:
ftp://updates.redhat.com/7.0/i386/openssh-2.3.0p1-4.i386.rpm
ftp://updates.redhat.com/7.0/i386/openssh-clients-2.3.0p1-4.i386.rpm
ftp://updates.redhat.com/7.0/i386/openssh-server-2.3.0p1-4.i386.rpm
ftp://updates.redhat.com/7.0/i386/openssh-askpass-2.3.0p1-4.i386.rpm
ftp://updates.redhat.com/7.0/i386/openssh-askpass-gnome-2.3.0p1-4.i386.rpm
sources:
ftp://updates.redhat.com/7.0/SRPMS/openssh-2.3.0p1-4.src.rpm
7. Verification:
MD5 sum Package Name
d564b593cce6c1afaa02a11004ef6cf7 7.0/SRPMS/openssh-2.3.0p1-4.src.rpm 973c033bd3cf3e3641f7fb9d172baf5a 7.0/i386/openssh-2.3.0p1-4.i386.rpm ead1cc84519f5a6fa0233ce8d3237457 7.0/i386/openssh-askpass-2.3.0p1-4.i386.rpm d426ff6c55181f8ccbea6e2f7a307b99 7.0/i386/openssh-askpass-gnome-2.3.0p1-4.i386.rpm 51fe082e6830e461a900000e2884cb14 7.0/i386/openssh-clients-2.3.0p1-4.i386.rpm dd9bb3271403162202599d3cd8b9a22e 7.0/i386/openssh-server-2.3.0p1-4.i386.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our
key is available at:
http://www.redhat.com/corp/contact.html
You can verify each package with the following command:
rpm –checksig <filename>
If you only wish to verify that each package has not been
corrupted or tampered with, examine only the md5sum with the
following command:
rpm –checksig –nogpg <filename>
8. References:
http://www.openbsd.org/errata27.html#sshforwarding
Copyright(c) 2000 Red Hat, Inc.