__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Center ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Cisco SN 5420 Storage Router Vulnerabilities [Cisco Security Advisory Revision 1.0] July 13, 2001 15:00 GMT Number L-112 ______________________________________________________________________________ PROBLEM: Two vulnerabilities exist in Cisco SN 5420 Storage Routers. The first allows a user to remotely reboot a router, and the second allows a remote user to access a developer's shell with no password or log-in giving the user complete control of the router. PLATFORM: CISCO SN 5420 Storage Routers running software release 1.1 (3) and earlier. DAMAGE: Using the first vulnerability, an intruder can cause a Denial-of-Service attack by continually rebooting the router. Using the second vulnerability, an intruder can log into a developer's shell, execute debug commands, start and stop processes, and interfere with the normal router operation. SOLUTION: Apply Cisco's upgrade to version 1.1 (4) of the router software to eliminate these vulnerabilities. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. The second vulnerability allows unrestricted ASSESSMENT: low level access to the router. ______________________________________________________________________________ [****** Start Cisco Advisory ******] Cisco Security Advisory: Vulnerabilities in Cisco SN 5420 Storage Routers Revision 1.0 For Public Release 2001 July 11 08:00 (UTC -0800) _________________________________________________________________ Summary Two vulnerabilities have been discovered in Cisco SN 5420 Storage Router software release up to and including 1.1(3). One of the vulnerabilities can cause Denial-of-Service attack. The other allows unrestricted low level access to the SN 5420. There is no workaround for these vulnerabilities. It is possible to mitigate them by blocking access to ports 513 and 8023 on the network edge. The vulnerabilities are documented in Cisco Bug IDs CSCdu27529 and CSCdu27514. No other Cisco product is affected by these vulnerabilities. This advisory is available at http://www.cisco.com/warp/public/707/SN-kernel-pub.html Affected Products Cisco SN 5420 Storage Routers running software release up to and including 1.1(3) are affected by the vulnerabilities. To determine your software release, type "show system" at the command prompt. No other Cisco products are affected by these vulnerabilities. Details CSCdu27529 You can reboot the device by rapidly establishing multiple connections to TCP port 8023. CSCdu27514 When logging into SN 5420 using "rlogin" or when connecting to the port 8023 from the GigabitEthernet or management interface, a user can access a developer's' shell of the SN 5420. The user is not asked for a password. No other authorization is performed. This shell is used during developing for testing. Starting with software releases 1.1(4), this capability is removed from the software. Impact By repeatedly exploiting CSCdu27529, it is possible to prevent a user from accessing storage, thus causing Denial-of-Service attack. When logged into a developer's shell (CSCdu27514), users can execute debug commands, start and stop processes, and interfere with the normal process execution. Users who are logged in such a manner and all commands executed by them are not logged or shown using the standard logging mechanism of the Cisco SN 5420 Storage Router. Software Versions and Fixes The vulnerabilities are fixed in the release 1.1(4) of the software, which is availabe on CCO. 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. Workarounds There is no workaround for these vulnerabilities. It is possible to mitigate them by blocking access to ports 513 and 8023 on the network edge. Exploitation and Public Announcements The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory. These vulnerabilities were found internally during product installation. 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/SN-kernel-pub.html. 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 * 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 2001-July-11 08:00 UTC -0800 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. The rest of the Cisco Security Advisories are available at http://www.cisco.com/go/psirt _________________________________________________________________ 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 Systems, Inc. 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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