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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0618 -- [Solaris] Solaris 10 Patches Cause ARP to Erroneously Detect Duplicate Network Address Which Leaves the Affected Interface in an Unusable State 28 August 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solaris 10 OpenSolaris Publisher: Sun Microsystems Operating System: Solaris Impact: Denial of Service Access: Existing Account Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-238887-1 Revision History: August 28 2008: Added OpenSolaris as a vulnerable product, resolution now available June 16 2008: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 238887 : Solaris 10 Patches Cause ARP to Erroneously Detect Duplicate Network Address Which Leaves the Affected Interface in an Unusable State Bug ID: 6691986 Product Solaris 10 Operating System OpenSolaris Date of Workaround Release: 13-Jun-2008 Date of Resolved Release: 26-Aug-2008 SA Document Body Installation of Solaris 10 patch 120011-14(SPARC) or 120012-14(x86) ... see below for details: 1. Impact Installation of Solaris 10 patch 120011-14(SPARC) or 120012-14(x86) may result in network interfaces being erroneously disabled by the removal of its published ARP Cache Entry (ACE). This happens when ARP (see arp(7P)) incorrectly determines that there has been an address conflict. Additionally there may be cases when the ACE should be deleted and the interface taken down due to a valid address conflict, but the interface is left in an 'UP' state without a published ACE. This issue does not require any 3rd party software to occur, however some cluster frameworks when used with IPMP (IP Multi Pathing) have been seen to trigger this issue upon cluster node reboot. The interaction of cluster framework code with IPMP tends to change interface flags quite rapidly, restarting the Duplicate Address Detection process several times during boot. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 with patch 120011-14 and without patch 137111-06 * OpenSolaris based upon builds snv_47 through snv_92 x86 Platform * Solaris 10 with patch 120012-14 and without patch 137112-06 * OpenSolaris based upon builds snv_47 through snv_92 Notes: Solaris 8 and 9 are not impacted by this issue. OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived. The base build can be derived as follows:- $ uname -a SunOS phys-node-1 5.11 snv_86 i86pc i386 i86pc 3. Symptoms When this issue occurs, the system loses communication with the network via the affected interface and the following message appears on the console and in log files: ar_entry_query: Could not find the ace for source address XX.XX.XX.XX" The source address referred to is the network address currently assigned to a local physical interface which is in the 'UP' state. Example: ar_entry_query: Could not find the ace for source address 10.10.10.1 In which case ifconfig might show something like: # ifconfig -a bge0: flags=201000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4,CoS> mtu 1500 index 2 inet 10.10.10.1 netmask ff000000 broadcast 10.255.255.255 4. Workaround Relief from this issue is possible by determining what the system should look like, monitoring that system and then rectifying the system if it affected by this issue as shown below. a) Determining which network address are assigned to each local physical interface, (which have the "P" flag set) using the following command :- $ netstat -np | grep P bge0 129.156.173.71 255.255.255.255 SPLA 00:14:4f:70:61:d6 bge1 129.156.205.9 255.255.255.255 SPLA 00:14:4f:6f:c7:54 Here the IP address assigned to bge0 is 129.156.173.71 a) Monitoring the output of netstat -p to determine when the issue has occurred by spotting when the entry for a local physical interface has disappeared - in this case 129.156.173.71 $ netstat -np | grep P bge1 129.156.205.9 255.255.255.255 SPLA 00:14:4f:6f:c7:54 b) Rectify the missing entry by using the following command:- (Substituting the IP address and MAC address found in step a). # arp -s 129.156.173.71 00:14:4f:70:61:d6 permanent pub The procedure should be relatively simple to script. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 10 with patch 137111-06 or later * OpenSolaris based upon builds snv_93 or later x86 Platform * Solaris 10 with patch 137112-06 or later * OpenSolaris based upon builds snv_93 or later 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. 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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 iQCVAwUBSLY4/Ch9+71yA2DNAQLmnQP+O53L7FkZ/VpoMkofcaoSzlmUbQTkNdYk ADZrMemz5B0bwW8ji11pqtucvWlbLfV+VzFLVc2t8CHAXILn/caIGWDs+USxvSC6 SEolhK8DFMx+0ad+i7MEhFwP+Wy2gX73U72Spcsx1U8J1eWiidN8Xi8GEjGPyMOq kAh21SvDLps= =dzk5 -----END PGP SIGNATURE-----