Security Advisory: Cisco Content Service Switch 11000 Series FTP Vulnerability

Type securityvulns
Reporter Securityvulns
Modified 2001-05-18T00:00:00



Cisco Security Advisory: Cisco Content Service Switch 11000 Series FTP Vulnerability ============================================================================== 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 vulnerability.

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


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 revisions

  • 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: .htm .htm

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.

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