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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2006.0595 -- [Solaris] On Solaris 10 libnsl(3LIB) or TLI/XTI API Routines May Cause Listener Programs for Databases or Other Network Aware Applications to Stop Responding 21 August 2006 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: libnsl TLI/XTI API Publisher: Sun Microsystems Operating System: Solaris 10 Impact: Denial of Service Access: Remote/Unauthenticated Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102576-1 - --------------------------BEGIN INCLUDED TEXT-------------------- Sun(sm) Alert Notification * Sun Alert ID: 102576 * Synopsis: On Solaris 10 libnsl(3LIB) or TLI/XTI API Routines May Cause Listener Programs for Databases or Other Network Aware Applications to Stop Responding * Category: Availability * Product: Solaris 10 Operating System * BugIDs: 6389163 * Avoidance: Binary * State: Workaround * Date Released: 16-Aug-2006 * Date Closed: * Date Modified: 1. Impact A race condition may cause listener programs for databases or other network aware applications to cease to respond if those listeners are coded using routines from libnsl(3LIB) or TLI/XTI APIs. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 with patch 118833-04 or later x86 Platform * Solaris 10 with patch 118833-03 or later Note: Solaris 8 and 9 are not impacted by this issue. 3. Symptoms Listener processes cease to respond to new connection attempts and begin to consume excessive CPU cycles. Using the truss(1) command on the listener process will find it to be executing in a tight loop through pollsys() or poll(). Because of the fact that the coding of listener processes varies considerably, it is difficult to provide a truly representative truss output. This however is one example: 342: pollsys(0x0005DE48, 6, 0x00000000, 0x00000000) = 1 342: lwp_sigmask(SIG_SETMASK, 0x00002000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF] 342: fstat(5, 0xFFBFF8C0) = 0 342: ioctl(5, I_PEEK, 0xFFBFF99C) = 1 342: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF] 342: pollsys(0x0005DE48, 6, 0x00000000, 0x00000000) = 1 342: lwp_sigmask(SIG_SETMASK, 0x00002000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF] 342: fstat(5, 0xFFBFF8C0) = 0 342: ioctl(5, I_PEEK, 0xFFBFF99C) = 1 342: lwp_sigmask(SIG_SETMASK, 0x00000000, 0x00000000) = 0xFFBFFEFF [0x0000FFFF] If the listener uses t_look(3NSL) it can be seen that a T_DATA message is present on the listener Stream, instead of the expected T_LISTEN messages, (T_DATA is defined as 0x4 in /usr/include/sys/tiuser.h) Truss of a listener which uses t_look() experiencing this issue would show something similar to this: libnsl:t_look() = 4 This results when a data message intended for an accepting endpoint is misdirected during the accept() processing, to the listener endpoint. 4. Relief/Workaround Binary relief is available through normal support channels for the following releases: SPARC Platform * Solaris 10 x86 Platform * Solaris 10 The following workaround should be used until the above can be implemented. Disable TCP fusion by adding the following line to the "/etc/system" file: set ip:do_tcp_fusion = 0x0 Add a comment referencing this Sun Alert and undo the above change before applying binaries or final resolution. Reboot the system so changes to /etc/system can take effect. 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 2000-2006 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 iQCVAwUBROlYqih9+71yA2DNAQLGAwP/UqaTgGnr++Ajq8iVfMZVWA6nxyzea25t po8fLNXqpm5tituoJOw65XYJKKrct+eire4T4slYMzBGxePcwOlSEzr6vv8eMrjI VQOZJZwydHprjKoqaxw0336K9eUve28C+IZCL0e/nVESjoaGNUQybfRjCOarwESO I/62DsldCRI= =z4xM -----END PGP SIGNATURE-----