__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Security Vulnerability in Solaris 10 NFS XDR Handling [Sun Alert ID: 102965] June 14, 2007 19:00 GMT Number R-278 ______________________________________________________________________________ PROBLEM: A security vulnerability in Solaris 10 related to the handling of XDR data within NFS requests may allow a local or remote unprivileged user to panic a Solaris system that is configured to run as an NFS server, resulting in a Denial of Service (DoS). PLATFORM: Solaris 10 Operating System DAMAGE: May result in a Denial of Service (DoS). SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is LOW. May result in a Denial of Service (DoS). ASSESSMENT: ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-278.shtml ORIGINAL BULLETIN: http://www.sunsolve.sun.com/search/document.do?assetkey=1 -26-102965-1 ______________________________________________________________________________ [***** Start Sun Alert ID: 102965 *****] Sun(sm) Alert Notification Sun Alert ID: 102965 Synopsis: A Security Vulnerability in Solaris 10 NFS XDR Handling May Allow a Denial of Service to NFS Servers Category: Security Product: Solaris 10 Operating System BugIDs: 6458704 Avoidance: Patch State: Resolved Date Released: 13-Jun-2007 Date Closed: 13-Jun-2007 Date Modified: 1. Impact A security vulnerability in Solaris 10 related to the handling of XDR data within NFS requests may allow a local or remote unprivileged user to panic a Solaris system that is configured to run as an NFS server, resulting in a Denial of Service (DoS). Sun wishes to thank Andrzej Dereszowski for bringing this issue to our attention. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform Solaris 10 without patch 125100-01 x86 Platform Solaris 10 without patch 125101-01 Notes: Solaris 8 and 9 are not impacted by this issue. This issue will only affect systems configured to run as NFS servers. To determine if a Solaris 10 system is configured to run as an NFS server, the following command can be run: $ svcs nfs/server STATE STIME FMRI online 14:30:59 svc:/network/nfs/server:default If the above command reports that NFS services are enabled (see smf(5)), the system may be vulnerable. 3. Symptoms Should the described issue occur, the system may panic with a stack trace which ends similar to the following: xdrmblk_getint32+0xb4(...) xdr_bool+0x70(...) ... Solution Summary Top 4. Relief/Workaround To prevent this issue until patches can be installed, NFS services may be disabled on the affected system by running the following command: # svcadm disable nfs/server 5. Resolution This issue is addressed in the following releases: SPARC Platform Solaris 10 with patch 125100-01 or later x86 Platform Solaris 10 with patch 125101-01 or later Note: Revisions prior to -04 of the above listed patches do not list bug 6458704 in the READMEs, however, this discrepancy is limited to the README; installation of these patches will in fact resolve this issue. When originally released, the READMEs for patches 124250 and 124251, revisions -01 to -03, incorrectly stated that those patches contained the fix for bug 6458704. Even if one of those two patches are installed on a system, either patch 125100-01 or 125101-01 (or later revisions) must be installed to resolve this issue (and patches 124250-01 and 124251-01 are not required to resolve this issue). 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 Sun Alert ID: 102965 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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