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TUCoPS :: Cisco :: ciacl085.txt

Cisco Content Services Switch ftp Vulnerability


                       The U.S. Department of Energy
                     Computer Incident Advisory Center
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN

                 Cisco Content Service Switch FTP Vulnerability

May 18, 2001 21:00 GMT                                            Number L-085
PROBLEM:       Cisco Content Service Switch (CSS) 11000 series do not enforce
               restrictions for non-privileged users opening an FTP connection
               to them.
PLATFORM:      CSS 11000 series switches
DAMAGE:        Any user with a valid account can read or write any file on the
               system. Users can gain unauthorized access to data.
SOLUTION:      Apply software upgrades as noted below.
VULNERABILITY  The risk is MEDIUM, an attacker must already have a valid
ASSESSMENT:    account.

[******  Start Cisco Advisory ******]

Cisco Security Advisory: Cisco Content Service Switch 11000 Series FTP
Revision 1.0
For Public Release 2001 May 17 at 1500 UTC

The Cisco Content Service Switch (CSS) 11000 series switches do not enforce
the correct restrictions for a non privileged user opening an FTP
connection to them. All users with valid accounts can use the GET and PUT
commands to read and write any file on the system. This vulnerability
results in users gaining access to secure data.

This vulnerability is documented as Cisco bug ID CSCdt64682.

This advisory will be posted at

Affected Products
The CSS 11000 series switches (formerly known as Arrowpoint), consist of
the CSS 11050, CSS 11150 and CSS 11800 hardware platforms. They run the
Cisco WebNS Software.

All switches running the following WebNS software revisions are affected by
this vulnerability

   * earlier than 4.01B23s
   * earlier than 4.10B13s

No other Cisco product is currently known to be affected  by this

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

A non privileged user (user account without administrative privileges) can
open an FTP connection to a CSS 11000 series switch and use GET and PUT FTP
commands, with no user level restrictions  enforced.

This vulnerability is documented as Cisco bug ID CSCdt64682, which requires
a CCO account to view.

A non privileged user can gain access to files on the switch they normally
would not have access to. This vulnerability can be minimized by
restricting ftp access to the CSS 11000 series switch.

Software Versions and Fixes
This vulnerability has been fixed in the following Cisco WebNS software

   * 4.01B23s or later
   * 4.10B13s or later

Obtaining Fixed Software
Cisco is offering free software upgrades to remedy this vulnerability for
all affected customers. Customers with service contracts may upgrade to any
software release containing the feature sets they have purchased.

Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades
should be obtained via the Software Center on Cisco's Worldwide Web site at

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:

See for additional TAC
contact information, including instructions and e-mail addresses for use in
various languages.

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 "" or
"" for software upgrades.

Don't configure non-privileged users on the switch. ( None are created by
default. )

Use the restrict command to enable or disable FTP access to the CSS. ( FTP
access is enabled by default.) (config)# restrict ftp

Access control lists can be applied to restrict FTP access to the Cisco CSS
device. Access control lists also affect traffic to the Virtual interface
of the Cisco CSS device, so must be applied with care. For further details
on configuring access lists please refer to the product documentation:

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 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.

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:

   * (includes CERT/CC)
   * 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	May 17, 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 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.

[******  End Cisco Advisory ******]

CIAC wishes to acknowledge the contributions of Cisco 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

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:
   Anonymous FTP:

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

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
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.

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