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AUSCERT External Security Bulletin Redistribution
ESB-2005.0051 -- Sun Alert Notification 57712
Security Vulnerability in Kerberos 5 Administration Library
for Solaris/SEAM
18 January 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: Solaris Enterprise Authentication Mechanism (SEAM)
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Execute Arbitrary Code/Commands
Access: Existing Account
CVE Names: CAN-2004-1189
Ref: ESB-2004.0805
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57712-1
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Sun(sm) Alert Notification
* Sun Alert ID: 57712
* Synopsis: Security Vulnerability in Kerberos 5 Administration
Library for Solaris/SEAM
* Category: Security
* Product: Solaris, Solaris Enterprise Authentication Mechanism
(SEAM)
* BugIDs: 6209960
* Avoidance: Workaround
* State: Committed
* Date Released: 22-Dec-2004
* Date Closed:
* Date Modified:
1. Impact Due to a heap buffer overflow, an authenticated user (not
necessarily one with administrative privileges), could execute
arbitrary code on the Kerberos Key Distribution Center (KDC) host,
compromising an entire Kerberos realm.
This issue is described in the following documents:
MIT krb5 Security Advisory at
[2]http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-004-pwhist.txt
CVE CAN-2004-1189 at
[3]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1189
2. Contributing Factors This issue can occur in the following
releases:
SPARC Platform
* Solaris 9
* SEAM 1.0.1 for Solaris 8
* SEAM 1.0.2 for Solaris 9
x86 Platform
* Solaris 9
* SEAM 1.0.1 for Solaris 8
* SEAM 1.0.2 for Solaris 9
Notes:
1. Systems running Solaris Enterprise Authentication Mechanism (SEAM)
1.0.1 for Solaris 8 and SEAM 1.0.2 for Solaris 9 are impacted by
this issue as SEAM 1.0.1 and 1.0.2 use the affected Kerberos
libraries delivered in Solaris.
2. Solaris Enterprise Authentication Mechanism (SEAM) is an unbundled
product available for Solaris 7, 8 and 9. For more information on
SEAM, please see the SEAM(5) man page.
This issue may occur if the machine is configured as the Key
Distribution Center (KDC). To verify this, the following command can
be run:
% ps -ef | grep kadmin
root 321 1 0 Dec 10 ? 0:00 /usr/krb5/lib/kadmind
If the above command shows that the daemon kadmind(1M) is running,
then the machine is configured as the Key Distribution Center (KDC).
3. Symptoms There are no predictable symptoms that would indicate the
described issue has been exploited.
Solution Summary [4]Top
4. Relief/Workaround It is advised that the history count is NOT
decreased on any policy in the Kerberos realm. If the count has been
decreased, it is advised to change it back to the previous higher
value. (Kerberos password history count is the number of previous
passwords that have been used by the principal that cannot be used).
To administer Kerberos, use kadmin(1M). To get the current history
count, the following command can be run at the kadmin(1M) prompt:
kadmin: get_policy <name of the policy>
Policy: ...
...
Number of old keys kept: 3
...
Here, the history count is the number of "old keys" kept. If the
history count is changed from a higher number to the (current) lower
number, change it back to the previous higher number. This can be done
by running the following command at the kadmin(1M) prompt:
kadmin: modify_policy -history <number> default
Please refer to kadmin(1M) man pages for further details.
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 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
References
1. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57712-1#top
2. http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-004-pwhist.txt
3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1189
4. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57712-1#top
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