Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2005.0291 -- Sun Alert Notification 57761
Buffer Overflow in telnet(1) Client Software Also Affects Kerberized Telnet
11 April 2005
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Sun Enterprise Authentication Mechanism Software
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CAN-2005-0469
Ref: ESB-2005.0244
Original Bulletin: http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57761-1
- --------------------------BEGIN INCLUDED TEXT--------------------
Sun(sm) Alert Notification
* Sun Alert ID: 57761
* Synopsis: Buffer Overflow in telnet(1) Client Software Also
Affects Kerberized Telnet
* Category: Security
* Product: Sun Enterprise Authentication Mechanism Software
* BugIDs: 6248576
* Avoidance: Workaround
* State: Engineering Complete
* Date Released: 07-Apr-2005
* Date Closed:
* Date Modified:
1. Impact There is a buffer overflow in the unprivileged kerberized
telnet(1) utility of Sun Enterprise Authentication Mechanism (SEAM)
Software for Solaris. This is not a security vulnerability on its own.
However, kerberized telnet(1) communicates with another host using the
TELNET protocol and thus there is a small risk of a remote user
successfully exploiting the overflow.
If a remote unprivileged user is able to cause a user to execute the
kerberized telnet(1) utility on their client system, then that remote
user may be able to execute arbitrary commands on the client system
with the privileges of the user who executed kerberized telnet(1).
This issue is described in CAN-2005-0469 at
[2]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469.
This issue is also described in the following CERT Vulnerability
Notes:
VU#291924 at [3]http://www.kb.cert.org/vuls/id/291924
VU#341908 at [4]http://www.kb.cert.org/vuls/id/341908
Sun acknowledges with thanks, iDEFENSE ([5]http://www.idefense.com),
for bringing this issue to our attention. This issue is also
referenced in the following iDEFENSE documents:
IDEF0866 - Multiple Telnet Client slc_add_reply() Buffer Overflow at
[6]http://www.idefense.com/application/poi/display?id=220
IDEF0867 - Multiple Telnet Client env_opt_add() Buffer Overflow at
[7]http://www.idefense.com/application/poi/display?id=221
2. Contributing Factors This issue can occur in the following
releases:
SPARC Platform
* SEAM 1.0 (for Solaris 7)
* SEAM 1.0.1 (for Solaris 8)
* SEAM 1.0.2 (for Solaris 9)
x86 Platform
* SEAM 1.0 (for Solaris 7)
* SEAM 1.0.1 (for Solaris 8)
* SEAM 1.0.2 (for Solaris 9)
Notes:
1. 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.
2. For Solaris without SEAM, see Sun Alert 57755 at
[8]http://sunsolve.sun.com/search/document.do?assetkey=1-26-57755-
1.
3. There is no unbundled SEAM product for Solaris 10. For systems
configured to use Kerberized telnet in Solaris 10, also see Sun
Alert 57755.
3. Symptoms There are no predictable symptoms that would indicate the
described issue has been exploited.
Solution Summary [9]Top
4. Relief/Workaround To work around the described issue until patches
can be installed, sites may consider removing the execute permissions
from the kerberized telnet(1) utility. To accomplish this, the
following command can be run (as "root"):
# chmod 000 /usr/krb5/bin/telnet
To restore the original permissions to the telnet(1) utility (after
the patches have been applied) the following command can be run (as
"root"):
# chmod 555 /usr/krb5/bin/telnet
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 2000-2005 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
[10]SunSolve Feedback | [11]Company Info | [12]Contact |
[13]Terms of Use | [14]Privacy | Version 5.12.0
[15]Copyright © 2005 Sun Microsystems, Inc. All rights reserved.
References
1. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57761-1#top
2. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0469
3. http://www.kb.cert.org/vuls/id/291924
4. http://www.kb.cert.org/vuls/id/341908
5. http://www.idefense.com/
6. http://www.idefense.com/application/poi/display?id=220
7. http://www.idefense.com/application/poi/display?id=221
8. http://sunsolve.sun.com/search/document.do?assetkey=1-26-57755-1
9. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57761-1#top
10. http://sunsolve.sun.com/pub-cgi/feedback.pl
11. http://www.sun.com/company/
12. http://www.sun.com/contact/
13. http://www.sun.com/share/text/termsofuse.html
14. http://www.sun.com/privacy/
15. javascript:popPage('/copyright.html',500,300)
- --------------------------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
iQCVAwUBQlnIoih9+71yA2DNAQJLEAQAnZB0CEOHPu7BlMjeL9ywiOVn0U8fOlzT
/SdDeg4ZsJrcBTpAtA96qKLm2IMw5ptOE86kaVewS4hIhwd8L4bPVp8+Oryjkn3O
rN7k6HHiyulYSuxwhiCQB7JEu1e6AgLoqJ2JhfNk/buu08DXAWo8RasRT8+WSyNc
Z3cSgEv8XKg=
=cUDM
-----END PGP SIGNATURE-----