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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.0533 -- [Solaris][OpenSolaris] Solaris Kerberos Credential Management: Inappropriate Access 9 June 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Solaris Kerberos Credential Management Publisher: Sun Microsystems Operating System: Solaris OpenSolaris Impact: Inappropriate Access Access: Existing Account CVE Names: CVE-2009-1933 Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-252787-1 Revision History: June 9 2009: Added CVE Reference June 5 2009: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Solution Type: Sun Alert Solution 252787 : A Security Vulnerability in Solaris Kerberos Credential Management May Lead to Unauthorized Access of Kerberized NFS Mount Points Bug ID: 6802931 Product Solaris 8 Operating System Solaris 9 Operating System Solaris 10 Operating System OpenSolaris Date of Resolved Release: 03-Jun-2009 SA Document Body A Security Vulnerability in Solaris Kerberos Credential Management May Lead to Unauthorized Access of Kerberized NFS Mount Points 1. Impact A security vulnerability in the Solaris Kerberos (see kerberos(5)) credential cache management may allow a local unprivileged user to access Kerberized mount points without authorization. Sun acknowledges with thanks, Anton Lundin for bringing this issue to our attention. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 8 without patch 140841-01 * Solaris 9 without patch 112908-34 * Solaris 10 without patch 140074-05 * OpenSolaris based upon build snv_01 through snv_116 x86 Platform * Solaris 8 without patch 140842-01 * Solaris 9 without patch 115168-19 * Solaris 10 without patch 140130-06 * OpenSolaris based upon build snv_01 through snv_116 Notes: 1. Solaris 8 entered EOSL Phase 2 on 1 April 2009. Entitlement to patches developed on or after 1 April 2009 requires the purchase of the Solaris 8 Vintage Patch Service. See note in section 5 for more details. 2. 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 -v snv_101 3. This issue could affect all systems utilizing Kerberized NFS mount points as an NFS client. To determine if a system could be exposed to this issue, the following command can be run: $ nfsstat -m | grep sec=krb If any data is returned, the system may be vulnerable to this issue. 3. Symptoms This issue exists on all systems utilizing Kerberized NFS mount points. There are no predictable symptoms that would indicate this issue has been exploited to gain unauthorized access to Kerberized NFS shares. 4. Workaround There is no workaround that would prevent unauthorized access to affected shares. It may be desirable therefore to modify the share and mount options so that they no longer utilize Kerberos. This can be done by editing of the dfstab(4) file on the NFS server and removing the 'sec=' option. Alternatively, the unshare(1) command can be used to unshare the filesystem, and the share(1) command to share the filesystem, not specifying the 'sec=' option. The client systems could then umount(1) the filesystem and then mount(1) with no 'sec=' option. This will allow UNIX system permissions to safeguard against unauthorized access. Note: As this workaround disables Kerberos for the affected NFS shares, the security of those shares may be impacted in various ways depending on the configuration. For example, network traffic associated with those shares may no longer be encrypted during transfer, and the access permissions will revert to those supported by the standard UNIX permissions implementation. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 8 with patch 140841-01 or later * Solaris 9 with patch 112908-34 or later * Solaris 10 with patch 140074-05 or later * OpenSolaris based upon build snv_117 or later x86 Platform * Solaris 8 with patch 140842-01 or later * Solaris 9 with patch 115168-19 or later * Solaris 10 with patch 140130-06 or later * OpenSolaris based upon build snv_117 or later Note: The READMEs of Solaris 8 patches developed on or after 1 April 2009 are available to all customers. However, Solaris 8 entered EOSL Phase 2 on April 1, 2009 and thus entitlement for these patches, including those that fix security vulnerabilities, requires the purchase of the Solaris 8 Vintage Patch Service. More information about the Solaris 8 Vintage Patch Service is available at: http://www.sun.com/service/eosl/Solaris8.html 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 2000-2009 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 iD8DBQFKLalLNVH5XJJInbgRAoiyAJ9n4RbOvUlGLs9UdxR1KoUR74xi9gCeJlqf M5sKUAw8kb9k9HYaLEaiKJk= =Vw5f -----END PGP SIGNATURE-----