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-----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-----