__________________________________________________________ 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 Vulnerability ============================================================================== Revision 1.0 For Public Release 2001 May 17 at 1500 UTC ------------------------------------------------------------------------ Summary ======= 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 http://www.cisco.com/warp/public/707/arrowpoint-ftp-pub.shtml. 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. Details ======= 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. Impact ====== 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 http://www.cisco.com. 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 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 "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades. Workarounds =========== 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: http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/bsccfggd/profiles .htm http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/advcfggd/sgacleql .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. Distribution ============ This notice will be posted on Cisco's Worldwide Web site at http://www.cisco.com/warp/public/707/arrowpoint-ftp-pub.shtml. 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 * comp.dcom.sys.cisco * 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 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. ------------------------------------------------------------------------ [****** 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 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org 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 http://www.first.org/. 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. 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