ࡱ> (*%&'S@ :?bjbj $t7 8FL+7j"(J```KKK6666666$8R:d6'GK''6``6Y Y Y 'XV``6Y '6Y Y [!60p,^2` ЛE1Q%r1560+71K;CK;8^2^2TK;34K?Y yKKK66 j1 (jSecure Collective Internet Defense (SCID) A proposal submitted to Network Information and Space Security Center (NISSC) for Summer 2003 (may request continued support for Fall 2003) C. Edward Chow 1. Project Goal The general objective of the proposed project is to create a secure collective internet defense system (SCID) that utilizes new cyber security defense techniques. SCID will push back intrusion attacks using an enhanced Intrusion Detection System and Isolation Protocol (IDIP) among a set of routers, and tolerate Distributed Denial of Services (DDoS) attacks with secure Domain Name System (DNS) updates, and alternate routes via a set of proxy servers with intrusion detection. A recent study conducted by the University of California, San Diego, detected approximately 12,805 Denial of Service attacks against more than 5000 targets during a three-week period in mid-2001 [1]. Even CERT, the authority that warns Internet users on security threats, fell victim to DDoS in May 2001 [2]. In a recent survey conducted by the SANS Institute on ``How to Eliminate the Ten Most Critical Internet Security Threats'', the number-one internet vulnerability reported by survey participants was BIND weaknesses [3]. BIND is the open-source software package that powers the majority of Internet DNS servers. The most prominent attack on DNS is the brief service disruption on the nine of the thirteen DNS root servers caused by DDoS bandwidth attacks October 2002 [4]. Most of the organizations have multiple gateways and can deploy multi-homing schemes using alternate gateways when the main gateway is attacked. But once the alternate gateways IP address is revealed, it is also subject to DDoS attacks. We propose to explore the use of protected indirect routes over a collection of geographical separated proxy servers to those alternate gateways and hide the IP address of those alternate gateways. The clients or client site DNS servers will be informed of the indirect routes through secure DNS updates. The new DNS entries will contain records like (Domain name, IP address, a set of IP addresses of designated proxy servers). Client requests will be sent to one of the selected proxy servers or spread over the set of designated proxy servers for better performance with aggregated bandwidth. The proxy server will be enhanced with integrated Intrusion Detection System (IDS) and a firewall filter to block intrusion traffic that may try to come in through the indirect route. The detection of intrusion on those proxy servers provides additional identification and isolation of the source of the attacks. The collection of proxy servers can be provided by participating organizations of a consortium, or branches of an organization. A secure IP tunnel can be established between a proxy server and an alternate gateway. This new set of network protocols and infrastructure can be used to defend the root DNS servers from DDoS attacks. Through this project, we will design new critical network infrastructure and protocols that are capable of delivering secure, reliable, and highly available network services. A grant of $10,000 for the Summer 2003 performance period is requested. 2. Broader Impact Network security has attracted attention because of the increasing frequency and severity of network attacks. The recent attacks reveal one of the fundamental security problems of todays Internet. Many internet services, such as DNS and routing protocols, were not originally designed with security as one of the basic requirements. It is very difficult to modify the existing protocols or network architecture without significant work. At the same time, it offers the proposed project an opportunity to create new, secure and reliable network protocols, and packet delivery systems. The research results and insights obtained from this project can improve the security of the networks and have a broader impact on the network architecture and the client side network software interface. 3. Related Work Recent work by Steven Cheung in University of California at Davis, introduced a wrapper-based solution to protect DNS, and a detection-based message authentication scheme to protect routers [5]. Angela Cearns from University of Colorado, Colorado Springs, implemented an Autonomous Anti-DDoS network (A2D2) with enhanced SNORT IDS for detecting subnet spoof attacks and with adaptive rate limiting and Class Based Queuing (CBQ) firewall rules for effective intrusion handling [6]. Jaeyeon Jung presented a detailed study and analysis of DNS performance and the effectiveness of DNS caching [9]. Variants of intrusion detection methods with fewer false positives, fewer false negatives and greater effectiveness have been developed. Zhu Hui described a sensor-based intrusion detection engine-SenIDS, which can process different security-relevant data types with various intrusion detection methods [13]. Bo Gaodeveloped anomaly detecting method for intrusion detection by using HMMs (Hidden Markov models) to learn the patterns of Unix processes. These patterns can be used to detect anomalies and known intrusion [14]. Network Associates Labs and Boeing developed the Intrusion Detection and Isolation Protocol (IDIP) to support real-time tracking and containment of attacks that cross network boundaries [7]. Service Location Protocol (SLP) is an IETF protocol that provides automatic client configuration for applications and advertisement for network services, i.e. locating IDIP nodes [8]. We will incorporate IDIP and SLP in SCID system. 4. Plan of Work There are two basic approaches to defend against DDoS attacks: one is called intrusion blocking/tracking that actively tracks down and blocks the traffic generated from those infected machines, and identifies the mastermind intruder; the other is called intrusion tolerance that studies how to tolerate intrusion and provides alternate routes for legitimate clients to access the victim site. The proposed research deals with mainly the latter approach by designing new software modules and protocols for providing such alternate routes. But by dividing the clients to come in through different proxy servers with intrusion detection devices, the proposed approach can also provide useful information for tracking down the intruder. One of the critical components in our SCID system is the shared usage of a collection of geographically distributed proxy servers, either provided by a service provider or contributed by each participating organization of a consortium. When a site is attacked, its intrusion detection system will generate the security alarms and send secure DNS updates to the DNS servers of the client sites. The secure DNS updates inform the clients to send packets through the designated proxy servers and hide the IP addresses of the alternate gateways of the victim site from the clients. Each designated proxy server knows the IP addresses of an alternate gateway of the victim site and relays the packets from the clients over an IP tunnel to the victim site. The designated proxy server is integrated with the intrusion detection system to detect and block potential DDoS attacks on these alternate gateways. The proposed secure DNS update design will create new DNS update protocol utilizing the Secure Socket Layer protocol for authentication and encryption. The existing DNS servers need to be modified to save the new cache entries with the domain name and IP address of the victim host machine, and the IP address of the designate proxy server. The DNS name resolving library on a client machine needs to be modified to accept the new type of DNS query results, and sends packets through the designate proxy server. For the exploratory prototype, we propose to modify the popular BIND 9 DNS software package from Internet Software Consortium and modify SOCK protocol software package to work with the name resolving library [10, 11].  Figure 1: DDoS attack without alternate routes [12] Figure 2: DDoS attack with alternate routes [12] Figure 1 shows the victim under DDoS attack, without the implementation of alternate routes. As a consequence, the bandwidth of legitimate clients is greatly reduced. Figure 2 shows the victim under DDoS attack, with the implementation of alternate routes. The attack network will be blocked at proxy servers, but the legitimate users will get updated alternate DNS entry information, and be re-directed to alternate proxy servers, then to the final destination. We will incorporate the Intrusion Detection and Isolation Protocol (IDIP) and Service Location Protocol (SLP) in the design. These will enhance the existing A2D2 architecture and make it more robust [7, 8]. The Linux-based proxy server will be integrated with the enhanced intrusion detection SNORT plug-in created in our Autonomous Anti-DDoS test bed project [6,12]. We will develop efficient intrusion detection methods with fewer false positives, fewer false negatives and greater effectiveness to divide the clients among a set of proxy servers [13, 14]. We will create test scripts that launch DDoS attacks and measure the performance of the SCID system. Through the collected data, we will evaluate the effectiveness of intrusion tolerance and push back mechanisms, and suggest their improvements. It is our hope that the preliminary research results of the proposed project will produce a valuable secure software package, and provide valuable insights for the network security related proposals. 5. Metrics for Evaluation We will consider the following matrices for evaluating the SCID system: 1. Soundness (no false positives) 2. Completeness (on false negatives) 3. Responsiveness (ability to restore the operation status of a network) We will collect the following types of performance data: 1. Time 2. Storage 3. Network Bandwidth 6. Answers for Questions in Proposal Requirements 1. What research capability currently exists related to the proposed work? In the Computer Science Network Lab, we have built a 4 node MPLS-VPN testbed. It can be used for hosting the proxy servers. It can also be used to deploy the SCID system and to launch the DDoS attacks for testing. We developed a high available content switch system which uses heartbeat protocol to monitor the availability of the content switch and use the mon software package to monitor the health status of the back end servers. The heartbeat and mon software can be used to address the fault tolerance issue in the SCID system. With the content switching, we can examine the headers and content of the packets while they traverse the networks. 2. What security-related area(s) will be investigated We will investigate in the area of Cyber-security and Information Protection, with emphasis in the following areas: Intrusion detection Computer network security 3. What will be accomplished in the project We will create a Secure Collective Internet Defense (SCID) system, which can push back intrusion attack using enhanced IDIP and SLP among a set of routers, and tolerate Distributed Denial of Services (DDoS) attacks through secure Domain Name System (DNS) updates and alternate routes via a set of proxy servers with intrusion detection. 4.Who will work on the project Dr. C. Edward Chow and his students in Department of Computer Science at UCCS 5.What timeframe the proposed work will be accomplished and the level of effort for each of the participants. TimeframeTask to be finished6/1/ 2003 6/30/2003Extend Bind9 DNS with Secure DNS update/query including indirect routing entries7/1/ 2003 7/31/2003Develop client side indirect routing; Enhance A2D2IDS with IDIP protocol8/1/ 2003 8/31/2003 May extend to Fall 2003Develop SLP for locating enhanced proxy server; Create test scripts and benchmark to evaluate SCID version 0.1 system; Suggest improvements to SCID version 0.2 system.7. References 1. David Moore, Geoffrey M. Voelker and Stefan Savage, Inferring Internet Denial-of-Service Activity 2001, http://www.cs.ucsd.edu/~savage/papers/UsenixSec01.pdf 2. ITWorld.com, CERT hit by DDoS attack for a third day. May 24, 2001, http://www.itworld.com/Sec/3834/IDG010524CERT2/ 3. The SANS Institute, How To Eliminate The Ten Most Critical Internet Security Threats http://www.sans.org/top20/top10.php, 2001 4. Internetnews.com, Massive DDoS Attack Hit DNS Root Servers, http://www.internetnews.com/ent-news/article.php/1486981 5. Steven Cheung, Ph.D. thesis An Intrusion Tolerance Approach for Protecting Network Infrastructures, http://citeseer.nj.nec.com/cheung99intrusion.html, 1999 6. Angela Cearns, Master Thesis Design of an Autonomous Anti-DDoS network (A2D2), http://cs.uccs.edu/~chow/pub/master/acearns/doc/angThesis-final.pdf, 2002 7. Network Associates Labs and Boeing, IDIP Architecture, http://zen.ece.ohiou.edu/~inbounds/DOCS/reldocs/IDIP_Architecture.doc, 2002. 8. SVRLOC working group, Service Location Protocol (SLP) Project, http://www.srvloc.org/ 9. Jaeyeon Jung, DNS performance and the effectiveness of caching , Networking, IEEE/ACM Transactions on, Volume 10 Issue 5, Oct 2002 10. Michael D. Bauer, Securing DNS and BIND, ACM  HYPERLINK "http://portal.acm.org/toc.cfm?id=J508&type=periodical&coll=portal&dl=ACM&CFID=10558858&CFTOKEN=65845202" \t "toc" Linux Journal   HYPERLINK "http://portal.acm.org/toc.cfm?id=364412&type=eissue&coll=portal&dl=ACM&CFID=10558858&CFTOKEN=65845202" \t "toc" Volume 2000Issue 78es, October 2000 11. John Viega, Matt Messier & Pravir Chandra, Network Security with OpenSSL, OReilly, 2002 12. Edward. Chow, Security Related Research Projects at UCCS network research lab, http://cs.uccs.edu/~Echow/research/security/uccsSecurityResearch.ppt, 2002 13. Zhu Hui; Tan, D.T.H., A sensor-based intrusion detection engine, Networks 2000, IEEE International Conference, 2000 14. Bo Gao; Hui-Ye Ma; Yu-Hang Yang,HMMs (Hidden Markov models) based on anomaly intrusion detection method, Machine Learning and Cybernetics, 2002. 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