Certificate Authorities (CA) and SSL Certificates
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1 Certificate Authorities (CA) and SSL Certificates Presented by: Laith Mohammad Hamasha Supervised by: Dr. Monther Aldwairi Student ID: 8308 INCS 745: Intrusion Detection and Hacker Exploits NYIT - Jordan
2 Agenda What is a CA? Issues regarding CAs Attack Types Certificate verification errors Countermeasures Questions and discussion References
3 What is a CA? Certification authority serve as a regulator facilitating identifying entities. Certificates are digitally signed documents by the CA that attest that the entity is who it claims it is. A certificate can be verified by decrypting it using the public key of the CA. Major CAs include: VeriSign, etrust, Comodo, DigiNotar.
4 Issues regarding CAs The scheme used proved to be insecure. E.g. Google Iran MITM attack September 2011 and nine top-tier websites certificates forged issued by Comodo. The enormous number of CAs (around 650) which is too much. Usage of SSL contains many operational flaws exploited by attackers: User legitimacy judgment, invalid certificate overriding mechanism
5 Attack Types Eavesdropping Shared media Unencrypted packets Man-In-The-Middle (MITM) Interception of packets ARP Spoofing (IP to MAC) DNS Spoofing (Domain to IP) ARP poisoning Altering ARP cache table in router Certificate Spoofing and forgery Impersonate the client and later can legitimately access the server or impersonate it also.
6 Certificate verification errors These errors trigger the predictable behavior in SSL (overriding) Causes: Self-signed certificate (private CA) Expired certificate Domain name mismatch Can be exploited through MITM & Certificate spoofing
7 Countermeasures User Legitimacy Judgment Responsibility of user to check clues and depend mainly on user security awareness. Prefix (HTTPS), Padlock, Spelling and content of website Currently assumed in the implementation of SSL and browsers nowadays. SSLock No interaction from the user Implemented in the more security-cautious firms Generic (FTPS, SMTP), light-weight (<50 LOC), Privacy-preserving (No cookies), idiot-proof Banks and secure entities must opt-in first
8 Countermeasures (continued) Context Sensitive Certificate Verification (CSCV) Cannot be overridden interface Security awarness User provide certificate manually (USB, Floppy) Contact information of system admin Proven to be very successful in experiment Specific Password Warnings (SPW) Triggered by unencrypted passwords only Security awareness Can be overridden (HTTP web mail)
9 Countermeasures (continued) Veiled Certificates (VC) New to the literature Multi-dimensional (Many credentials) Provide privacy (Preserve personal information) Adhere to legal reporting requirement Can be aggregated Introduce the concept of VC token (owner ID + User certificate specific public key) Local key management is essential (Many VC tokens)
10 Questions & Discussion
11 References [1] Iranian Man-in-the-Middle Attack Against Google Demonstrates Dangerous Weakness of Certificate Authorities, Commentary by Seth Schoen and Eva Galperin, Electronic Frontier Foundation, [2] The flawed certificate authority system, Angela Moscaritolo, From the October 2011 Issue of SCMagazine, [3] SSLock: Sustaining the Trust on Entities Brought by SSL,Adonis P.H. Fung, K.W. Cheung, [4] Hardening Web Browsers Against ManintheMiddle and Eavesdropping Attacks, Haidong Xia and Jos e Carlos Brustoloni. [5] Analysis and Countermeasures of Security Vulnerability on Portal Sites, Kyoungju Kwak, Kwangwoo Lee, Dongho Won, Seungjoo Kim, [6] Privacy-Preserving Multi-Dimensional Credentialing Using Veiled Certificates, Chin-Tser Huang, John H. Gerdes, Jr. [7] When Private Keys are Public: Results from the 2008 Debian OpenSSL Vulnerability, Scott Yilek, Eric Rescorla, Hovav Shacham, Brandon Enright, Stefan Savage
![scmagazineus.com/theflawed-certificate-authority-system/article/212015/ [3] SSLock: Sustaining the Trust on Entities Brought by SSL,Adonis P.H. Fung, K.W.](/docs-images/51/13825069/images/page_11.jpg "Cheung, [4] Hardening Web Browsers Against ManintheMiddle and Eavesdropping Attacks, Haidong Xia and Jos e Carlos Brustoloni.")
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