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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2006.0492 -- [Solaris] A Local Unprivileged User May be Able to Cause a Denial of Service (DoS) to Solaris 10 Hosts via the "/net" Mount Point 24 July 2006 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solaris 10 Publisher: Sun Microsystems Operating System: Solaris 10 Impact: Denial of Service Access: Existing Account Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102286-1 - --------------------------BEGIN INCLUDED TEXT-------------------- Sun(sm) Alert Notification * Sun Alert ID: 102286 * Synopsis: A Local Unprivileged User May be Able to Cause a Denial of Service (DoS) to Solaris 10 Hosts via the "/net" Mount Point * Category: Security, Availability * Product: Solaris 10 Operating System * BugIDs: 6336467 * Avoidance: Patch, Workaround * State: Resolved * Date Released: 19-Jul-2006 * Date Closed: 19-Jul-2006 * Date Modified: 1. Impact A security vulnerability in Solaris 10 may allow a local unprivileged user the ability to panic the system using the special "/net" mount point (or a similarly configured mount point which uses the "-hosts" special map), creating a Denial of Service (DoS) condition. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 without patch 118833-11 x86 Platform * Solaris 10 without patch 118855-08 Note: Solaris 8 and Solaris 9 are not impacted by this issue. This issue only affects systems which have the autofs(4) service enabled and a "-hosts" entry in the "/etc/auto_master" file. To determine if a system has the autofs(4) service enabled, the svcs(1) command can be used: $ svcs svc:/system/filesystem/autofs:default STATE STIME FMRI online Mar_20 svc:/system/filesystem/autofs:default To determine if a "-hosts" entry is present in the "/etc/auto_master" file, the grep(1) utility can be used: $ grep -- -hosts /etc/auto_master /net -hosts -nosuid,nobrowse 3. Symptoms If the described issue occurs, the system will panic with a stack trace similar to the following: bad stack overflow at TL 1 setjmp() panicsys() vpanic() panic() ptl1_panic_handler() fbread () blkatoff() ufs_dirlook ufs_lookup() fop_lookup() lo_lookup() 4. Relief/Workaround To work around the described issue, comment out or remove the following entry from the "/etc/auto_master" file: /net -hosts -nosuid,nobrowse Note: All mounts contained in the "/net" directory will need to be unmounted, and the automount(1M) command will need to be used for the above change to take effect. If it's not possible to unmount any of the mounts in the "/net" directory due to the file system being busy, then the system will need to be rebooted after the "auto_master" file has been altered. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 10 with patch 118833-11 or later x86 Platform * Solaris 10 with patch 118855-08 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 2000-2006 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 iQCVAwUBRMRerCh9+71yA2DNAQKw+AQAgtTY7c+dnm+2W4ZpDO8p4yhBzvtHpyCB dW060C+nxK3riwt/wiXIpIX110AAbvVbdb7203DW5S3xGrZl3aDXpQsMcdH6q0e9 OvcZows3Ct2QotfYY0sHtf+g2Ks3b3VgtXvTphcPbfgJg4j0yBir6sv77I/W72RF COvWcNWSZJs= =Q92F -----END PGP SIGNATURE-----