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Sicherheit: Fehler im X11 Forwarding von OpenSSH
Aktuelle Meldungen Distributionen
Name: Fehler im X11 Forwarding von OpenSSH
ID: RHSA-2000:111-03
Distribution: Red Hat
Plattformen: Red Hat Linux
Datum: Di, 21. November 2000, 12:00
Referenzen: http://www.openbsd.org/errata27.html#sshforwarding
Applikationen: Portable OpenSSH

Originalnachricht

---------------------------------------------------------------------
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.



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