__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Center
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INFORMATION BULLETIN
Cisco SN 5420 Storage Router Vulnerabilities
[Cisco Security Advisory Revision 1.0]
July 13, 2001 15:00 GMT Number L-112
______________________________________________________________________________
PROBLEM: Two vulnerabilities exist in Cisco SN 5420 Storage Routers. The
first allows a user to remotely reboot a router, and the second
allows a remote user to access a developer's shell with no
password or log-in giving the user complete control of the
router.
PLATFORM: CISCO SN 5420 Storage Routers running software release 1.1 (3)
and earlier.
DAMAGE: Using the first vulnerability, an intruder can cause a
Denial-of-Service attack by continually rebooting the router.
Using the second vulnerability, an intruder can log into a
developer's shell, execute debug commands, start and stop
processes, and interfere with the normal router operation.
SOLUTION: Apply Cisco's upgrade to version 1.1 (4) of the router software
to eliminate these vulnerabilities.
______________________________________________________________________________
VULNERABILITY The risk is HIGH. The second vulnerability allows unrestricted
ASSESSMENT: low level access to the router.
______________________________________________________________________________
[****** Start Cisco Advisory ******]
Cisco Security Advisory: Vulnerabilities in Cisco SN 5420 Storage Routers
Revision 1.0
For Public Release 2001 July 11 08:00 (UTC -0800)
_________________________________________________________________
Summary
Two vulnerabilities have been discovered in Cisco SN 5420 Storage
Router software release up to and including 1.1(3). One of the
vulnerabilities can cause Denial-of-Service attack. The other allows
unrestricted low level access to the SN 5420.
There is no workaround for these vulnerabilities. It is possible to
mitigate them by blocking access to ports 513 and 8023 on the network
edge.
The vulnerabilities are documented in Cisco Bug IDs CSCdu27529 and
CSCdu27514.
No other Cisco product is affected by these vulnerabilities.
This advisory is available at
http://www.cisco.com/warp/public/707/SN-kernel-pub.html
Affected Products
Cisco SN 5420 Storage Routers running software release up to and
including 1.1(3) are affected by the vulnerabilities.
To determine your software release, type "show system" at the command
prompt.
No other Cisco products are affected by these vulnerabilities.
Details
CSCdu27529
You can reboot the device by rapidly establishing multiple
connections to TCP port 8023.
CSCdu27514
When logging into SN 5420 using "rlogin" or when connecting to
the port 8023 from the GigabitEthernet or management interface,
a user can access a developer's' shell of the SN 5420. The user
is not asked for a password. No other authorization is
performed. This shell is used during developing for testing.
Starting with software releases 1.1(4), this capability is
removed from the software.
Impact
By repeatedly exploiting CSCdu27529, it is possible to prevent a user
from accessing storage, thus causing Denial-of-Service attack.
When logged into a developer's shell (CSCdu27514), users can execute
debug commands, start and stop processes, and interfere with the
normal process execution. Users who are logged in such a manner and
all commands executed by them are not logged or shown using the
standard logging mechanism of the Cisco SN 5420 Storage Router.
Software Versions and Fixes
The vulnerabilities are fixed in the release 1.1(4) of the software,
which is availabe on CCO.
Obtaining Fixed Software
Cisco is offering free software upgrades to eliminate this
vulnerability for all affected customers. Customers with contracts
should obtain upgraded software through their regular update channels.
For most customers, this means that upgrades should be obtained
through the Software Center on Cisco's Worldwide Web site at
http://www.cisco.com.
Customers whose Cisco products are provided or maintained through
prior or existing agreement with third-party support organizations
such as Cisco Partners, authorized resellers, or service providers
should contact that support organization for assistance with the
upgrade, which should be free of charge.
Customers without contracts should get their upgrades by contacting
the Cisco Technical Assistance Center (TAC). TAC contacts are as
follows:
* +1 800 553 2447 (toll-free from within North America)
* +1 408 526 7209 (toll call from anywhere in the world)
* e-mail: tac@cisco.com
Give the URL of this notice as evidence of your entitlement to a
free upgrade. Free upgrades for non-contract customers must be
requested through the TAC.
Please do not contact either "psirt@cisco.com" or
"security-alert@cisco.com" for software upgrades.
Workarounds
There is no workaround for these vulnerabilities. It is possible to
mitigate them by blocking access to ports 513 and 8023 on the network
edge.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerabilities described in this advisory.
These vulnerabilities were found internally during product
installation.
Status of This Notice: FINAL
This is a final notice. Although Cisco cannot guarantee the accuracy
of all statements in this notice, all of the facts have been checked
to the best of our ability. Cisco does not anticipate issuing updated
versions of this notice unless there is some material change in the
facts. Should there be a significant change in the facts, Cisco may
update this notice.
Distribution
This notice will be posted on Cisco's Worldwide Web site at
http://www.cisco.com/warp/public/707/SN-kernel-pub.html. In
addition to Worldwide Web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the
following e-mail and Usenet news recipients:
* cust-security-announce@cisco.com
* bugtraq@securityfocus.com
* first-teams@first.org (includes CERT/CC)
* cisco@spot.colorado.edu
* comp.dcom.sys.cisco
* firewalls@lists.gnac.com
* Various internal Cisco mailing lists
Future updates of this notice, if any, will be placed on Cisco's
Worldwide Web server, but may or may not be actively announced on
mailing lists or newsgroups. Users concerned about this problem are
encouraged to check the URL given above for any updates.
Revision History
Revision 1.0 2001-July-11 08:00 UTC -0800 Initial public release
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and
registering to receive security information from Cisco, is available
on Cisco's Worldwide Web site at
http://www.cisco.com/warp/public/707/sec_incident_response.shtml.
This includes instructions for press inquiries regarding Cisco
security notices.
The rest of the Cisco Security Advisories are available at
http://www.cisco.com/go/psirt
_________________________________________________________________
This notice is Copyright 2001 by Cisco Systems, Inc. This notice may
be redistributed freely after the release date given at the top of the
text, provided that redistributed copies are complete and unmodified,
and include all date and version information.
_________________________________________________________________
[****** End Cisco Advisory ******]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Cisco Systems, Inc. for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Center, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7x24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
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herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
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