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Cisco Security Advisory: Cisco Content Service Switch 11000 Series FTP Vulnerability
From: Cisco Systems Product Security Incident Response Team <psirt () cisco com>
Date: Thu, 17 May 2001 08:58:35 -0800
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Cisco Security Advisory: Cisco Content Service Switch 11000 Series FTP
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
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
* 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: tac () cisco com
See http://www.cisco.com/warp/public/687/Directory.shtml for additional TAC
contact information, including instructions and e-mail addresses for use in
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.
Don't configure non-privileged users on the switch. ( None are created by
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:
* cust-security-announce () cisco com
* bugtraq () securityfocus com
* firewalls () lists gnac com
* first-teams () first org (includes CERT/CC)
* cisco () spot colorado edu
* 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 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
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.
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- Cisco Security Advisory: Cisco Content Service Switch 11000 Series FTP Vulnerability Cisco Systems Product Security Incident Response Team (May 17)