-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                        ESB-2008.0844 -- [Solaris]
         A Regression in the Secure Shell Daemon (sshd(1M)) Breaks
             X11 Forwarding Functionality on IPv4 Only Systems
                             1 September 2008

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              sshd
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Denial of Service
Access:               Existing Account

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-240906-1

- --------------------------BEGIN INCLUDED TEXT--------------------

   Solution Type: Sun Alert
   Solution  240906 :   A Regression in the Secure Shell Daemon
   (sshd(1M)) Breaks X11 Forwarding Functionality on IPv4 Only Systems          
   Bug ID: 6704823

   Product
   Solaris 9 Operating System
   Solaris 10 Operating System

   Date of Workaround Release: 20-Aug-2008

   SA Document Body
   A regression in the Secure Shell Daemon (sshd(1M)):

   1. Impact
   The Sun Secure Shell (SSH) patches listed in the "Contributing
   Factors" section below break the Secure Shell X11 forwarding feature
   on systems with only IPv4 interfaces configured.
   
   2. Contributing Factors
   This issue can occur in the following releases:
   SPARC Platform
     * Solaris 9 with patch 122300-28 or later
     * Solaris 10 with patch 126133-03 or later OR patch 138060-03

   x86 Platform
     * Solaris 9 with patch 122301-28 or later
     * Solaris 10 with patch 126134-03 or later OR patch 138061-03

   Note 1: Solaris 8 is not impacted by this issue.
   Note 2 : Open Solaris installations are not impacted by this issue.
   Note3:  This issue only affects systems that have only IPv4 interfaces
   configured.
   To determine if a system has only IPv4 interfaces configured the
   following command can be run:
    $ ifconfig lo0 inet6 || echo "System is affected"
    ifconfig: status: SIOCGLIFFLAGS: lo0: no such interface
    System is affected

   3. Symptoms
   If the described issue occurs, an error message similar to the
   following will be seen on the console and in the syslog of the system
   being logged into with ssh(1):
    Aug 20 11:01:53 solaris sshd: [ID 800047 auth.error] error:
    Failed to allocate internet-domain X11 display socket.

   Once logged in, the $DISPLAY variable will not be set and X11 programs
   will not display on the client system:
   $ ssh -X solarishost
   $ /usr/openwin/bin/xclock
   Error: Can't open display:
   $ echo $DISPLAY

   4. Workaround
   To work around this issue, the following command can be executed as
   root user:
    # ifconfig lo0 inet6 plumb up

   Users who are already connected to the host must re-login to use X
   forwarding.
   Binary Relief is available through normal support channels for Solaris
   8 and Solaris 9.
   The following T-patches are available through normal support channels
   for the following releases:
   SPARC Platform:
     * Solaris 10 T-patch T138060-04

   x86 Platform
     * Solaris 10 T-patch T138061-04

   Note: Removal of the affected patches is not recommended as a
   workaround as they resolve a security issue, bug 6684003, as described
   in Sun Alert 237444.
   
   5. Resolution
   A final resolution is pending completion.

   This Sun Alert notification is being provided to you on an "AS IS"
   basis. This Sun Alert notification may contain information provided by
   third parties. The issues described in this Sun Alert notification may
   or may not impact your system(s). Sun makes no representations,
   warranties, or guarantees as to the information contained herein. ANY
   AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
   WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
   NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
   YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
   INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
   OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
   This Sun Alert notification contains Sun proprietary and confidential
   information. It is being provided to you pursuant to the provisions of
   your agreement to purchase services from Sun, or, if you do not have
   such an agreement, the Sun.com Terms of Use. This Sun Alert
   notification may only be used for the purposes contemplated by these
   agreements. 
   Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBSLstICh9+71yA2DNAQLT5wP/b8OFaoVLvpQl8g+L2ovj2E3j28FjmXoV
NyPgI3/SHLe7jeP80k0VMHUzKiwNIIC9eRBm4XqbdCqcl28dKKAfwjMlD33sswMi
MyCruG9+L3XVcJrzdmWgTelvPwLQEI/HKvAUfh4gR/GYc+b6eIqcSj7sSo7ZDNvS
ZezWhX/pE/4=
=+Wqq
-----END PGP SIGNATURE-----