===================================================================== CERT-Renater Note d'Information No. 2009/VULN026 _____________________________________________________________________ DATE : 16/01/2009 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Solaris 8, Solaris 9, Solaris 10, OpenSolaris running ACL Implementation for UFS. ====================================================================== http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-242267-1 ______________________________________________________________________ Solution Type: Sun Alert Solution 242267 : Security Vulnerability in the ACL (acl(2)) Implementation for UFS File Systems May Allow a Local User to Panic the System Bug ID: 6748275 Product Solaris 8 Operating System Solaris 9 Operating System Solaris 10 Operating System OpenSolaris Date of Preliminary Release: 18-Sep-2008 SA Document Body Security Vulnerability in the ACL (acl(2)) Implementation for UFS File Systems May Allow a Local User to Panic the System 1. Impact A security vulnerability in the Solaris Access Control List (ACL) (see acl(2)) implementation for UFS file systems may allow a local unprivileged user to panic a system which has a UFS filesystem. This is a type of Denial of Service (DoS). Sun would like to acknowledge with thanks, Nils Goroll, for bringing this issue to our attention and aiding us in the development of a fix through the OpenSolaris project. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 8 * Solaris 9 without patch 122300-34 * Solaris 10 without patch 139483-01 * OpenSolaris based upon builds snv_01 through snv_99 x86 Platform * Solaris 8 * Solaris 9 without patch 122301-34 * Solaris 10 without patch 139484-01 * OpenSolaris based upon builds snv_01 through snv_99 Note: This issue only affects systems which have UFS file systems mounted which are writable (read-write). To print the list of UFS file systems mounted read-write on the system, the following command can be run: $ mount -p | grep ufs | grep rw 3. Symptoms If this issue is experienced, the system will panic with a message similar to the following: panic[cpu0]/thread=300043e8060: BAD TRAP: type=31 rp=2a10165f130 addr=70 mmu_fs r=0 occurred in module "ufs" due to a NULL pointer dereference unix:die+78 (...) unix:trap+9e0 (...) unix:ktl0+48 (...) ufs:ufs_acl_access+4 (...) ufs:ufs_dirlook+48 (...) ufs:ufs_lookup+2ac (...) genunix:fop_lookup+28 (...) genunix:lookuppnvp+344 (...) genunix:lookuppnat+120 (...) genunix:lookupnameat+5c (...) genunix:cstatat_getvp+198 (...) genunix:cstatat64_32+40 (...) Note that either ufs_acl_access() or ufs_iaccess() are the top most UFS functions in the call stack. 4. Workaround There is no workaround for this issue. Please see the Resolution section below. Preliminary T-Patches are available for the following releases from http://sunsolve.sun.com/tpatches SPARC Platform * Solaris 8 T-patch T117350-60 x86 Platform * Solaris 8 T-patch T117351-60 This document refers to one or more preliminary temporary patches (T-Patches) which are designed to address the concerns identified herein. Sun has limited experience with these patches due to their preliminary nature. As such, you should only install the patches on systems meeting the configurations described above. Sun may release full patches at a later date, however, Sun is under no obligation whatsoever to create, release, or distribute any such patch. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 9 with patch 122300-34 or later * Solaris 10 with patch 139483-01 or later * OpenSolaris based upon builds snv_100 or later x86 Platform * Solaris 9 with patch 122301-34 or later * Solaris 10 with patch 139484-01 or later * OpenSolaris based upon builds snv_100 or later A final resolution is pending completion for Solaris 8. For more information on Security Sun Alerts, see Technical Instruction ID 213557. 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 ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================