Cisco Security Advisory: 2 Vulnerabilities in Cisco SN 5420 Storage Routers
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...
Posted on 2.8.2001
Cisco Security Advisory: Vulnerabilities in Cisco SN 5420 Storage Routers
Revision 1.0
For Public Release 2001 July 11 08:00 (UTC -0800)
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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
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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.
