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AUSCERT External Security Bulletin Redistribution
ESB-2008.0465 -- [Solaris]
Security Vulnerability in Solaris SSH May Allow Unauthorized
Access to X11 Sessions
4 July 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: ssh
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Inappropriate Access
Access: Existing Account
CVE Names: CVE-2008-1483
Ref: AA-2008.0078
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-237444-1
Revision History: July 4 2008: Patches Released
May 7 2008: Initial Release
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Solution Type: Sun Alert
Solution 237444 : Security Vulnerability in Solaris SSH May Allow
Unauthorized Access to X11 Sessions
Bug ID: 6684003
Product
Solaris 9 Operating System, Solaris 10 Operating System
Date of Workaround Release: 05-May-2008
Date of Resolved Release: 02-Jul-2008
SA Document Body
A Security Vulnerability in Solaris SSH may allow Unauthorized Access to
X11 Sessions
1. Impact
A security vulnerability related to X11 forwarding within the SSH
product shipped with Solaris may allow a local unprivileged user to
gain unauthorized access to another user's X11 session. This may allow
execution of code with the privileges of that user or may result in
the disclosure of sensitive data related to the user's session.
This issue is also referenced in the following document:
CVE-2008-1483 at
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1483
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 9 without patch 114356-14
* Solaris 10 without patch 126133-03
x86 Platform
* Solaris 9 without patch 114357-13
* Solaris 10 without patch 126134-03
Note: SSH is not shipped with Solaris 8 and therefore is not impacted
by this issue.
This issue only affects systems which are configured to run the SSH
service. The following can be used to determine if the sshd(1M) daemon
is running on a host:
$ pgrep sshd || echo "sshd not running"
This issue only affects SSH sessions which have X11 forwarding
enabled. By default users are allowed to enable this facility for any
new sessions (see sshd(1)). To determine whether the X11 forwarding
setting has been changed from the default, the sshd_config(4) file can
be examined, for example:
% grep X11Forwarding /etc/ssh/sshd_config
X11Forwarding no
3. Symptoms
There are no predictable symptoms that would indicate the described
vulnerability has been exploited.
4. Workaround
To workaround this issue, X11 forwarding can be disabled for
individual SSH sessions by running the ssh(1) as follows when those
sessions are initiated:
$ ssh -o ForwardX11=no ...
OR
$ ssh -x ...
Alternatively, the sshd_config(4) file on a host can be modified to
disable X11 forwarding for all incoming SSH connections to that host,
by changing the following line in "/etc/ssh/sshd_config" (or adding it
if not already present) from:
X11Forwarding yes
to
X11Forwarding no
and then restarting ssh:
For Solaris 9:
# /etc/init.d/sshd stop ; /etc/init.d/sshd start
For Solaris 10:
# svcadm restart ssh
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 9 with patch 114356-14 or later
* Solaris 10 with patch 126133-03 or later
x86 Platform
* Solaris 9 with patch 114357-13 or later
* Solaris 10 with patch 126134-03 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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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