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AUSCERT External Security Bulletin Redistribution
ESB-2009.1232.2
Security Vulnerability in Solaris sockfs Related to HTTP Request Handling
May Allow Remote Users to Panic Web Servers Resulting in a
Denial of Service (DoS)
11 September 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: sockfs
Publisher: Sun Microsystems
Operating System: Solaris
OpenSolaris
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2009-3000
Original Bulletin:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-265888-1
Revision History: September 11 2009: OpenSolaris svn patch released
August 31 2009: Initial Release
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Solution Type: Sun Alert
Solution 265888 : Security Vulnerability in Solaris sockfs Related
to HTTP Request Handling May Allow Remote Users to Panic Web Servers
Resulting in a Denial of Service (DoS)
Bug ID: 6834314
Product:
Solaris 10 Operating System
OpenSolaris
Date of Workaround Release: 26-Aug-2009
Date of Resolved Release: 10-Sep-2009
SA Document Body
A security vulnerability in the Solaris sockfs kernel module:
1. Impact
A security vulnerability in the Solaris sockfs kernel module may allow
a local or remote unprivileged HTTP client to panic a vulnerable
Solaris web server thereby resulting in a Denial of Service (DoS) to
the system as a whole.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 with patch 118833-25 or later and without patch
141690-02
* OpenSolaris based upon builds snv_41 through snv_122
x86 Platform
* Solaris 10 with patch 118855-25 or later and without patch
141691-02
* OpenSolaris based upon builds snv_41 through snv_122
Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
Note 2: This issue only occurs if a system is configured as an HTTP
server utilizing the Solaris Network Cache Accelerator (nca(1)) and
has logging enabled. To determine if NCA is enabled on the system,
execute the following command:
$ grep status=enabled /etc/nca/ncakmod.conf
status=enabled
Please reference ncakmod.conf(4) for more information on configuring
the NCA kernel module.
Physical interfaces registered to use the NCA feature are listed in
the "/etc/nca/nca.if" file:
$ cat /etc/nca/nca.if
hme0
hme1
Please reference nca.if(4) for more information on specifying the
physical interfaces for NCA.
To determine if NCA logging is enabled, execute the following command:
$ grep status=enabled /etc/nca/ncalogd.conf
status=enabled
Note 3: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived. To determine
the base build of OpenSolaris, the following command can be used:
$ uname -v
snv_111
3. Symptoms
If the described issue occurs, the system will panic with a NULL
pointer dereference on nl7c_http_log. The stack trace will be similar
to the following:
nl7c_http_log+0x9a()
nl7c_logd_log+0x16f()
nl7c_parse+0x49f()
nl7c_process+0x141()
sotpi_recvmsg+0x618()
socktpi_read+0x84()
fop_read+0x31()
read+0x188()
read32+0xe()
_sys_sysenter_post_swapgs+0x14b()
4. Workaround
To work around the described issue until patches can be installed,
disable logging of NCA by setting "status=disabled" in
"/etc/nca/ncalogd.conf". Please refer to ncalogd.conf(4) for details.
A system reboot is required for the change to be effective. Please
refer to reboot(1M) for more details.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 141690-02 or later
* OpenSolaris based upon builds snv_123 or later
x86 Platform
* Solaris 10 with patch 141691-02 or later
* OpenSolaris based upon builds snv_123 or later
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
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