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AUSCERT External Security Bulletin Redistribution
ESB-2003.0679 -- Sun(sm) Alert Notification
Sun Alert ID: 56861 Secure Shell Daemon (sshd(1M)) Buffer Management
Security Vulnerability
23 September 2003
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AusCERT Security Bulletin Summary
---------------------------------
Product: sshd
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access Required: Remote
CVE Names: CAN-2003-0693
Ref: AL-2003.16
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DOCUMENT ID: 56861
SYNOPSIS: Secure Shell Daemon (sshd(1M)) Buffer Management Security
Vulnerability
DETAIL DESCRIPTION:
Sun(sm) Alert Notification
* Sun Alert ID: 56861
* Synopsis: Secure Shell Daemon (sshd(1M)) Buffer Management
Security Vulnerability
* Category: Security
* Product: Solaris
* BugIDs: 4923312
* Avoidance: Workaround
* State: Committed
* Date Released: 19-Sep-2003
* Date Closed:
* Date Modified:
1. Impact
The Solaris Secure Shell daemon, sshd(1M), shipped with Solaris 9, is
based on OpenSSH and is affected by a buffer management security
vulnerability which may allow local or remote unprivileged users to
execute arbitrary commands with the permissions of the sshd(1M) daemon
or create a denial of service condition by corrupting the heap of the
sshd(1M) daemon. The sshd(1M) daemon normally runs with "root" (uid 0)
privileges.
This issue is described in the CERT Vulnerability VU#333628 (see
[1]http://www.kb.cert.org/vuls/id/333628) which is referenced in CERT
Advisory CA-2003-24 (see
[2]http://www.cert.org/advisories/CA-2003-24.html).
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 9
x86 Platform
* Solaris 9
Note: Solaris 8 and earlier releases did not ship with Solaris Secure
Shell and therefore are not vulnerable.
3. Symptoms
There are no predictable symptoms that would indicate the above
described issues have been exploited.
SOLUTION SUMMARY:
4. Relief/Workaround
Until patches are available for this issue sites are advised to
disable the sshd(1M) daemon on Solaris 9 systems. The following
commands can be run as root to kill the existing sshd(1M) daemon and
prevent it from starting up after future reboots:
# /etc/init.d/sshd stop
# mv /etc/rc3.d/S89sshd /etc/rc3.d/not-S89sshd
5. Resolution
A final resolution is pending completion.
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 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
References
1. http://www.kb.cert.org/vuls/id/333628
2. http://www.cert.org/advisories/CA-2003-24.html
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