An Effective Protection Mechanism for SSL Man-in-the-Middle Proxy Attacks

SSL MITM 프록시 공격에 대한 효과적 방어방법

  • Received : 2010.01.20
  • Accepted : 2010.03.28
  • Published : 2010.06.15

Abstract

In current e-commerce system, it happens that client's confidential information such as credit card numbers, pin numbers, or digital certificate may pass through a web proxy server or an altered proxy server without client's awareness. Even though the confidential information is encrypted and sent through SSL(Secure Sockets Layer) or TLS(Transport Layer Security) protocol, it can be exposed to the risk of sniffing by the digital certificate forgery at the proxy server, which is called the SSL MITM(Man-In-The-Middle) Proxy attack. In this paper, current credit card web-payment systems, which is weak at proxy information alternation attack, are analyzed. A resolution with certificate proxy server is also proposed to prevent the MITM attack.

신용카드 정보나 공인 인증서들이 웹을 통해 전송되어지는 현재 전자상거래 시스템에서 사용자의 의도와 다르게 클라이언트가 웹 프록시 서버를 경유하게 되거나 프록시 서버의 경로가 변경될 경우가 종종 발생한다. 이때 전송되는 기밀 정보가 SSL(Secure Sockets Layer) 또는 TLS(Transport Layer Security)프로토콜을 통해 암호화 되어 전송 되어도 프록시 서버에서 인증서 변조를 통하여 계좌번호나 신용카드 비밀번호를 스니핑 당하는 위험에 노출된다. 본 논문에서는 현재 사용되고 프록시 정보 변조 해킹에 의해 무방비 상태의 신용카드 결제 보안 시스템에 대해서 분석하고 이를 방지하기 위한 인증 프록시 서버와 프록시 변조 MITM(Man-In-The-Middle) 공격 방지 방법에 대해서 제안한다.

Keywords

References

  1. Dierks, T., and Rescorla, E., "The TLS Protocol Version 1.1," RFC 4346, 2006.
  2. Oppliger, R., Hauser, R., and Basin, D., "SSL/TLS Session-Sware User Authentication Revisited," In Proc. COMPSEC, pp.64-70, 2008.
  3. Oppliger, R., Hauser, R., and Basin, D., "SSL/TLS Session-Aware User Authentication," Computer & Communication, vol.41(3), pp.59-65, 2008.
  4. Burkholder, P., "SSL Man-in-the-Middle Attacks," SANS Institute, p.15, 2002.
  5. Bringer, J., and Chabanne H., "Trusted-HB: A Low-Cost Version of HB Secure Against Man-inthe- Middle Attacks," IEEE Transactions on Information Theory, vol.54(9), pp.4339-4342, 2008. https://doi.org/10.1109/TIT.2008.928290
  6. Klein, A., "HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics," Sanctum Inc., p.31, 2004.
  7. Liu, A., Yuan, Y., Wijesekera, D., and Stavrou, A., "SQLProb: a Proxy-Based Architecture Towards Preventing SQL Injection Attacks," In Proc. SAC pp.2054-2061, 2009.
  8. Oppliger, R., and Gajek, S., "Effective Protection Against Phishing and Web Spoofing," In Proc. CMS, vol.3677, pp.32-41, 2005.
  9. Adelsbach, A., and Gajek, S., Schwenk, J., "Visual Spoofing of SSL Protected Web Sites and Effective Countermeasures," In Proc. ISPEC, pp.204-216, 2005.
  10. W. Diffie and M.E. Hellman, "New directions in cryptography," IEEE Transactions on Information Theory, vol.22, no.6, pp.644-654, 1976. https://doi.org/10.1109/TIT.1976.1055638