Session Hijacking Attacks in Wireless Local Area Networks
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Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection 2004-03 Session hijacking attacks in wireless local area networks Onder, Hulusi Monterey, California. Naval Postgraduate School http://hdl.handle.net/10945/1641 MONTEREY, CALIFORNIA THESIS SESSION HIJACKING ATTACKS IN WIRELESS LOCAL AREA NETWORKS by Hulusi ONDER March 2004 Thesis Advisor: Geoffrey XIE Second Reader: John GIBSON Approved for public release; distribution is unlimited THIS PAGE INTENTIONALLY LEFT BLANK REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188) Washington DC 20503. 1. AGENCY USE ONLY 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED March 2004 Master’s Thesis 4. TITLE AND SUBTITLE: Session Hijacking attacks in Wireless Local Area 5. FUNDING NUMBERS Networks 6. AUTHOR Hulusi ONDER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING Naval Postgraduate School ORGANIZATION REPORT Monterey, CA 93943-5000 NUMBER 9. SPONSORING /MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY REPORT NUMBER 11. SUPPLEMENTARY NOTES The views expressed in this thesis are those of the author and do not reflect the official policy or position of the Department of Defense or the U.S. Government. 12a. DISTRIBUTION / AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE Approved for public release; distribution is unlimited 13. ABSTRACT Wireless Local Area Network (WLAN) technologies are becoming widely used since they provide more flexibility and availability. Unfortunately, it is possible for WLANs to be implemented with security flaws which are not addressed in the original 802.11 specification. IEEE formed a working group (TGi) to provide a complete solution (code named 802.11i standard) to all the security problems of the WLANs. The group proposed using 802.1X as an interim solution to the deficiencies in WLAN authentication and key management. The full 802.11i standard is expected to be finalized by the end of 2004. Although 802.1X provides a better authentication scheme than the original 802.11 security solution, it is still vulnerable to denial-of-service, session hijacking, and man-in-the-middle attacks. Using an open-source 802.1X test-bed, this thesis evaluates various session hijacking mechanisms through experimentation. The main conclusion is that the risk of session hijacking attack is significantly reduced with the new security standard (802.11i); however, the new standard will not resolve all of the problems. An attempt to launch a session hijacking attack against the new security standard will not succeed, although it will result in a denial-of-service attack against the user. 14. SUBJECT TERMS 15. NUMBER OF Wireless Local Area Networks, Authentication, Security, Session Hijacking, 802.1X, 802.11, 802.11i, PAGES Encryption, Access Control, Supplicant, Authenticator, Authentication Server, open-source test-bed. 151 16. PRICE CODE 17. SECURITY 18. SECURITY 19. SECURITY 20. LIMITATION CLASSIFICATION OF CLASSIFICATION OF THIS CLASSIFICATION OF OF ABSTRACT REPORT PAGE ABSTRACT Unclassified Unclassified Unclassified UL NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. 239-18 i THIS PAGE INTENTIONALLY LEFT BLANK ii Approved for public release; distribution is unlimited SESSION HIJACKING ATTACKS IN WIRELESS LOCAL AREA NETWORKS Hulusi ONDER Lieutenant Junior Grade, Turkish Navy B.S., Turkish Naval Academy, 1998 Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN COMPUTER SCIENCE from the NAVAL POSTGRADUATE SCHOOL March 2004 Author: Hulusi ONDER Approved by: Geoffrey Xie, PhD Thesis Advisor John Gibson Second Reader Peter Denning Chairman, Department of Computer Science iii THIS PAGE INTENTIONALLY LEFT BLANK iv ABSTRACT Wireless Local Area Network (WLAN) technologies are becoming widely used since they provide more flexibility and availability. Unfortunately, it is possible for WLANs to be implemented with security flaws which are not addressed in the original 802.11 specification. IEEE formed a working group (TGi) to provide a complete solution (code named 802.11i standard) to all the security problems of the WLANs. The group proposed using 802.1X as an interim solution to the deficiencies in WLAN authentication and key management. The full 802.11i standard is expected to be finalized by the end of 2004. Although 802.1X provides a better authentication scheme than the original 802.11 security solution, it is still vulnerable to denial-of-service, session hijacking, and man-in- the-middle attacks. Using an open-source 802.1X test-bed, this thesis evaluates various session hijacking mechanisms through experimentation. The main conclusion is that the risk of session hijacking attack is significantly reduced with the new security standard (802.11i); however, the new standard will not resolve all of the problems. An attempt to launch a session hijacking attack against the new security standard will not succeed, although it will result in a denial-of-service attack against the user. v THIS PAGE INTENTIONALLY LEFT BLANK vi TABLE OF CONTENTS I. INTRODUCTION........................................................................................................1 A. BACKGROUND ..............................................................................................1 B. THESIS OBJECTIVES...................................................................................2 C. THESIS ORGANIZATION............................................................................2 II. BACKGROUND AND SESSION HIJACKING ATTACKS ..................................5 A. INTRODUCTION............................................................................................5 B. IEEE 802.1X AUTHENTICATION MECHANISM....................................6 1. Introduction..........................................................................................6 2. Elements of the Authentication Mechanism......................................6 a. Supplicant..................................................................................6 b. Authenticator.............................................................................6 c. Authentication Server ...............................................................7 3. Application of the 802.1X Standard for WLANS .............................7 4. Protocols Used by the 802.1X Standard.............................................8 a. Extensible Authentication Protocol over LAN (EAPOL)........9 b. Extensible Authentication Protocol (EAP) ............................11 c. Remote Authentication Dial in User Service (RADIUS).......13 5. 802.1X Authentication Procedure ....................................................15 C. SESSION HIJACKING ATTACK ..............................................................18 1. Introduction........................................................................................18 2. Vulnerabilities of the 802.1X Authentication Scheme....................18 a. Propagation Medium ..............................................................19 b. Miscommunication of the State Machines.............................19 c. Lack of Authenticity................................................................20 d. One Way Authentication.........................................................20 e. Encryption ...............................................................................21 3. Discussion of the University of Maryland Paper ............................21 D. SUMMARY ....................................................................................................22 III. AN OPEN-SOURCE WIRELESS PROTOCOL TEST-BED ...............................23 A. INTRODUCTION..........................................................................................23 B. 802.1X AUTHENTICATION TEST-BED...................................................23 1. Elements of the Authentication Test-Bed ........................................24 2. Authentication Methods ....................................................................24 3. Hardware and Software Configuration of the Test-Bed................24 a. Supplicant................................................................................24 b. Authenticator...........................................................................26 c. Authentication Server .............................................................32 4. EAP-TLS Authentication Method....................................................36 5. X.509v3 Certificates...........................................................................37 6. Validation............................................................................................38 vii C. SUMMARY ....................................................................................................39 IV. APPLICATION OF THE SESSION HIJACKING ATTACK .............................41