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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
Comment: This vulnerability does not impact Solaris 8 or 9.
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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:
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:
* Solaris 10 without patch 128491-01
* 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.
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.
There is no workaround for this issue.
This issue is addressed in the following releases:
* Solaris 10 with patch 128491-01 or later
* 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
notification may only be used for the purposes contemplated by these
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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