Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2009.1564.2
Security Vulnerability in the Timeout Mechanism of Solaris
sshd(1M) may Lead to a Denial of Service (DoS)
27 November 2009
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Solaris sshd
Publisher: Sun Microsystems
Operating System: Solaris
OpenSolaris
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-4075
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-272629-1
Revision History: November 27 2009: Added CVE Reference
November 25 2009: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Vulnerability in the Timeout Mechanism of Solaris sshd(1M)
may Lead to a Denial of Service (DoS)
_________________________________________________________________
Category : Security
Release Phase : Resolved
Bug Id : 6868716
Product : Solaris 10
OpenSolaris
Date of Resolved Release : 23-Nov-2009
A security vulnerability in the timeout mechanism of Solaris sshd(1M):
1. Impact
A security vulnerability in the timeout mechanism of Solaris sshd(1M)
may allow a remote unprivileged user to cause a Denial of Service
(DoS) condition. If this issue is exploited, the sshd(1M) daemon will
stop accepting new ssh(1) connections.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 5/09 (or later) with patch 140000-02 and without patch
143140-01
* OpenSolaris based upon builds snv_99 through snv_123
x86 Platform
* Solaris 10 5/09 (or later) with patch 140119-02 and without patch
141525-06
* OpenSolaris based upon builds snv_99 through snv_123
Notes:
1. Solaris 8 and 9 are not impacted by this issue.
2. This issue only affects systems which are configured to run the SSH
service.
The following command can be used to determine if the sshd(1M) daemon
is running on a host:
$ pgrep sshd || echo "sshd not running"
3. Symptoms
When the described issue occurs, sshd(1M) on the affected host stops
accepting new connections and users attempting to connect remotely may
see the following message:
ssh_exchange_identification: Connection closed by remote host
4. Workaround
There is no workaround for this issue. Please see the Resolution
section below.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 143140-01 or later
* OpenSolaris based upon builds snv_124 or later
x86 Platform
* Solaris 10 5/09 (or later) with patch 141525-06 or later
* OpenSolaris based upon builds snv_124 or later
For more information on Security Sun Alerts, see Technical Instruction
ID 213557:
http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1
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
iD8DBQFLDw1GNVH5XJJInbgRAo6DAJ4ve8Q7lOVDONxWfS+1qrAbE1BntgCfWwat
/DnWn7CQIWUV9j/s6B4f0+U=
=Bz7n
-----END PGP SIGNATURE-----