AUSCERT External Security Bulletin Redistribution

                  ESB-2001.235 -- Cisco Security Advisory
                   Cisco 6400 NRP2 Telnet Vulnerability
                               15 June 2001


        AusCERT Security Bulletin Summary

Product:                telnet
Vendor:                 Cisco
Operating System:       Cisco IOS before version 12.1(05)DC01
Platform:               Cisco 6400 NRP2
Impact:                 Inappropriate Access
Access Required:        Remote

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Cisco Security Advisory: Cisco 6400 NRP2 Telnet Vulnerability
Revision 1.0
For Public Release 2001 June 14 at 1500 UTC

The Cisco 6400 Access Concentrator Node Route Processor 2 (NRP2) module
allows Telnet access when no password has been set. The correct response is
to disallow any remote access to the module until the password has been
set. This vulnerability may result in users gaining unintended access to
secure systems.

This vulnerability is documented as Cisco bug ID CSCdt65960.

This advisory will be posted at

Affected Products
Cisco 6400 NRP2 modules running Cisco IOSĀ® release earlier than
12.1(05)DC01 are affected by this vulnerability.

Cisco 6400 NSP and Cisco 6400 NRP1 modules are not affected by this
vulnerability. No other Cisco product is currently known to be affected by
this vulnerability.

To determine your software revision, type show version at the command line

The Cisco 6400 Access Concentrator NRP2 module allows Telnet access when no
password is set for the vtys on the NRP2. This vulnerability affects the
Gigabit Ethernet, ATM and Serial interface on the NRP2. The correct
response is to not allow any remote access to the module until the vty
password has been set.

This vulnerability is documented as Cisco bug ID CSCdt65960, which requires
a CCO account to view.

A user can gain access to secure systems if the initial vtys have not had
their password set.

This vulnerability can be eliminated by applying the workaround or by
upgrading the IOS.

Software Versions and Fixes
This vulnerability has been fixed in Cisco IOS release 12.1(05)DC01 or

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.

Apply password to all the 32 vtys on the NRP2.

Enable Prompt>  vty 0 31 password "the-password"

Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerabilities described in this advisory.

This vulnerability was reported to Cisco by a Cisco customer.

Status of This Notice: FINAL
This is a final PSIRT advisory. 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 advisory unless there is some material change in
the facts. Should there be a significant change in the facts, Cisco may
update this advisory.

This notice will be posted on Cisco's Worldwide Web site at

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
   * cisco-nsp@puck.nether.net
   * 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	June 14,2001	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.

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.

Version: PGP 7.0.1


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