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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0970 -- [Solaris] A Security Vulnerability Resulting From Solaris 10 fcp(7D) and devfs(7FS) Interaction May Allow Certain File Operations to Cause a System Hang 3 December 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Fibre Channel Protocol driver Devices File System Publisher: Sun Microsystems Operating System: Solaris 10 Impact: Denial of Service Access: Existing Account Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102947-1 Comment: This vulnerability does not impact Solaris 8 or 9. - --------------------------BEGIN INCLUDED TEXT-------------------- Sun(sm) Alert Notification * Sun Alert ID: 102947 * Synopsis: A Security Vulnerability Resulting From Solaris 10 fcp(7D) and devfs(7FS) Interaction May Allow Certain File Operations to Cause a System Hang * Category: Security * Product: Solaris 10 Operating System * BugIDs: 6526639 * Avoidance: Patch * State: Resolved * Date Released: 29-Nov-2007 * Date Closed: 29-Nov-2007 * Date Modified: 1. Impact A security vulnerability with Fibre Channel Protocol driver (fcp(7D)) and Devices File System (devfs(7FS)) in Solaris 10 may allow a local unprivileged user to cause commands such as cfgadm(1M) or format(1M) to hang when run, or cause the system as a whole to hang. This is a type of denial of service (DoS) to the system. Note: This issue may also occur accidentally and not as a result of a Denial of Service attempt. 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 10 without patch 128491-01 x86 Platform * Solaris 10 without patch 128492-01 Note 1: Solaris 8 and Solaris 9 are not impacted by this issue. Note 2: This issue is due to a race condition between the Fibre Channel protocol driver (fcp(7D)) and the devfs(7FS) file system. When Solaris 10 first shipped, this condition was very unlikely to be seen and no occurrences were reported. However, the fibre channel device driver patch 119130-25 for SPARC systems and patch 119131-25 for x86 systems, introduces a retry mechanism in the driver which makes this issue more likely to occur. A system is only vulnerable to this issue if it is using fibre-channel attached storage which is managed by Sun's SAN Foundation Software (SFS) fibre channel stack using the fp(7d) driver. To determine if the fp(7d) driver is being used to manage fibre-channel attached storage, the following command can be used: $ egrep "/fp@.*/" /etc/path_to_inst|head -1 "/pci@8,600000/SUNW,qlc@2/fp@0,0/ssd@w2100002037f3fbe1,0" 3 "ssd" \_ fp driver is present in the device path If no output is produced from the above command, the system is not vulnerable to this issue. 3. Symptoms If the described issue occurs, commands such as cfgadm(1M) and format(1M) may hang indefinitely and attempts to kill them will fail. Alternatively, the system may completely hang. 4. Relief/Workaround There is no workaround for this issue. 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 10 with patch 128491-01 or later x86 Platform * Solaris 10 with patch 128492-01 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. 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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 iQCVAwUBR1NoSyh9+71yA2DNAQKvwwP/X+XnY8wDIH5FNWzaI+RTDOxSL68f6L15 ysso5GxeLVgxNuUVQk2LT524GOE6Q7mUrMipL+6xxdu+1ZcjjBDDcEUH/9z1Je4s B/seh7UTOk+MPWqzl2KtcppdrsaUPVeSAoGzhxvh1RNuS31JjrKBAvq6mzipx6vR AnH/Yxvy2vM= =JSyh -----END PGP SIGNATURE-----