The Global TLS Certificate Authority Market Key Insights for Enterprise End Users
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Using Frankencerts for Automated Adversarial Testing of Certificate
Using Frankencerts for Automated Adversarial Testing of Certificate Validation in SSL/TLS Implementations Chad Brubaker ∗ y Suman Janay Baishakhi Rayz Sarfraz Khurshidy Vitaly Shmatikovy ∗Google yThe University of Texas at Austin zUniversity of California, Davis Abstract—Modern network security rests on the Secure Sock- many open-source implementations of SSL/TLS are available ets Layer (SSL) and Transport Layer Security (TLS) protocols. for developers who need to incorporate SSL/TLS into their Distributed systems, mobile and desktop applications, embedded software: OpenSSL, NSS, GnuTLS, CyaSSL, PolarSSL, Ma- devices, and all of secure Web rely on SSL/TLS for protection trixSSL, cryptlib, and several others. Several Web browsers against network attacks. This protection critically depends on include their own, proprietary implementations. whether SSL/TLS clients correctly validate X.509 certificates presented by servers during the SSL/TLS handshake protocol. In this paper, we focus on server authentication, which We design, implement, and apply the first methodology for is the only protection against man-in-the-middle and other large-scale testing of certificate validation logic in SSL/TLS server impersonation attacks, and thus essential for HTTPS implementations. Our first ingredient is “frankencerts,” synthetic and virtually any other application of SSL/TLS. Server authen- certificates that are randomly mutated from parts of real cer- tication in SSL/TLS depends entirely on a single step in the tificates and thus include unusual combinations of extensions handshake protocol. As part of its “Server Hello” message, and constraints. Our second ingredient is differential testing: if the server presents an X.509 certificate with its public key. -
Secure Shell- Its Significance in Networking (Ssh)
International Journal of Application or Innovation in Engineering & Management (IJAIEM) Web Site: www.ijaiem.org Email: [email protected] Volume 4, Issue 3, March 2015 ISSN 2319 - 4847 SECURE SHELL- ITS SIGNIFICANCE IN NETWORKING (SSH) ANOOSHA GARIMELLA , D.RAKESH KUMAR 1. B. TECH, COMPUTER SCIENCE AND ENGINEERING Student, 3rd year-2nd Semester GITAM UNIVERSITY Visakhapatnam, Andhra Pradesh India 2.Assistant Professor Computer Science and Engineering GITAM UNIVERSITY Visakhapatnam, Andhra Pradesh India ABSTRACT This paper is focused on the evolution of SSH, the need for SSH, working of SSH, its major components and features of SSH. As the number of users over the Internet is increasing, there is a greater threat of your data being vulnerable. Secure Shell (SSH) Protocol provides a secure method for remote login and other secure network services over an insecure network. The SSH protocol has been designed to support many features along with proper security. This architecture with the help of its inbuilt layers which are independent of each other provides user authentication, integrity, and confidentiality, connection- oriented end to end delivery, multiplexes encrypted tunnel into several logical channels, provides datagram delivery across multiple networks and may optionally provide compression. Here, we have also described in detail what every layer of the architecture does along with the connection establishment. Some of the threats which Ssh can encounter, applications, advantages and disadvantages have also been mentioned in this document. Keywords: SSH, Cryptography, Port Forwarding, Secure SSH Tunnel, Key Exchange, IP spoofing, Connection- Hijacking. 1. INTRODUCTION SSH Secure Shell was first created in 1995 by Tatu Ylonen with the release of version 1.0 of SSH Secure Shell and the Internet Draft “The SSH Secure Shell Remote Login Protocol”. -
Analysis of SSL Certificate Reissues and Revocations in the Wake
Analysis of SSL Certificate Reissues and Revocations in the Wake of Heartbleed Liang Zhang David Choffnes Dave Levin Tudor Dumitra¸s Northeastern University Northeastern University University of Maryland University of Maryland [email protected] [email protected] [email protected] [email protected] Alan Mislove Aaron Schulman Christo Wilson Northeastern University Stanford University Northeastern University [email protected] [email protected] [email protected] ABSTRACT Categories and Subject Descriptors Central to the secure operation of a public key infrastruc- C.2.2 [Computer-Communication Networks]: Net- ture (PKI) is the ability to revoke certificates. While much work Protocols; C.2.3 [Computer-Communication Net- of users' security rests on this process taking place quickly, works]: Network Operations; E.3 [Data Encryption]: in practice, revocation typically requires a human to decide Public Key Cryptosystems, Standards to reissue a new certificate and revoke the old one. Thus, having a proper understanding of how often systems admin- istrators reissue and revoke certificates is crucial to under- Keywords standing the integrity of a PKI. Unfortunately, this is typi- Heartbleed; SSL; TLS; HTTPS; X.509; Certificates; Reissue; cally difficult to measure: while it is relatively easy to deter- Revocation; Extended validation mine when a certificate is revoked, it is difficult to determine whether and when an administrator should have revoked. In this paper, we use a recent widespread security vul- 1. INTRODUCTION nerability as a natural experiment. Publicly announced in Secure Sockets Layer (SSL) and Transport Layer Secu- April 2014, the Heartbleed OpenSSL bug, potentially (and rity (TLS)1 are the de-facto standards for securing Internet undetectably) revealed servers' private keys. -
You Really Shouldn't Roll Your Own Crypto: an Empirical Study of Vulnerabilities in Cryptographic Libraries
You Really Shouldn’t Roll Your Own Crypto: An Empirical Study of Vulnerabilities in Cryptographic Libraries Jenny Blessing Michael A. Specter Daniel J. Weitzner MIT MIT MIT Abstract A common aphorism in applied cryptography is that cryp- The security of the Internet rests on a small number of open- tographic code is inherently difficult to secure due to its com- source cryptographic libraries: a vulnerability in any one of plexity; that one should not “roll your own crypto.” In par- them threatens to compromise a significant percentage of web ticular, the maxim that complexity is the enemy of security traffic. Despite this potential for security impact, the character- is a common refrain within the security community. Since istics and causes of vulnerabilities in cryptographic software the phrase was first popularized in 1999 [52], it has been in- are not well understood. In this work, we conduct the first voked in general discussions about software security [32] and comprehensive analysis of cryptographic libraries and the vul- cited repeatedly as part of the encryption debate [26]. Conven- nerabilities affecting them. We collect data from the National tional wisdom holds that the greater the number of features Vulnerability Database, individual project repositories and in a system, the greater the risk that these features and their mailing lists, and other relevant sources for eight widely used interactions with other components contain vulnerabilities. cryptographic libraries. Unfortunately, the security community lacks empirical ev- Among our most interesting findings is that only 27.2% of idence supporting the “complexity is the enemy of security” vulnerabilities in cryptographic libraries are cryptographic argument with respect to cryptographic software. -
Ten Strategies of a World-Class Cybersecurity Operations Center Conveys MITRE’S Expertise on Accumulated Expertise on Enterprise-Grade Computer Network Defense
Bleed rule--remove from file Bleed rule--remove from file MITRE’s accumulated Ten Strategies of a World-Class Cybersecurity Operations Center conveys MITRE’s expertise on accumulated expertise on enterprise-grade computer network defense. It covers ten key qualities enterprise- grade of leading Cybersecurity Operations Centers (CSOCs), ranging from their structure and organization, computer MITRE network to processes that best enable effective and efficient operations, to approaches that extract maximum defense Ten Strategies of a World-Class value from CSOC technology investments. This book offers perspective and context for key decision Cybersecurity Operations Center points in structuring a CSOC and shows how to: • Find the right size and structure for the CSOC team Cybersecurity Operations Center a World-Class of Strategies Ten The MITRE Corporation is • Achieve effective placement within a larger organization that a not-for-profit organization enables CSOC operations that operates federally funded • Attract, retain, and grow the right staff and skills research and development • Prepare the CSOC team, technologies, and processes for agile, centers (FFRDCs). FFRDCs threat-based response are unique organizations that • Architect for large-scale data collection and analysis with a assist the U.S. government with limited budget scientific research and analysis, • Prioritize sensor placement and data feed choices across development and acquisition, enteprise systems, enclaves, networks, and perimeters and systems engineering and integration. We’re proud to have If you manage, work in, or are standing up a CSOC, this book is for you. served the public interest for It is also available on MITRE’s website, www.mitre.org. more than 50 years. -
SSL Checklist for Pentesters
SSL Checklist for Pentesters Jerome Smith BSides MCR, 27th June 2014 # whoami whoami jerome • Pentester • Author/trainer – Hands-on technical – Web application, infrastructure, wireless security • Security projects – Log correlation – Dirty data – Incident response exercises • Sysadmin • MSc Computing Science (Dist) • www.exploresecurity.com | @exploresecurity Introduction • Broad review of SSL/TLS checks – Viewpoint of pentester – Pitfalls – Manually replicating what tools do (unless you told the client that SSL Labs would be testing them ) – Issues to consider reporting (but views are my own) • While SSL issues are generally low in priority, it’s nice to get them right! • I’m not a cryptographer: this is all best efforts SSLv2 • Flawed, e.g. no handshake protection → MITM downgrade • Modern browsers do not support SSLv2 anyway – Except for IE but it’s disabled by default from IE7 – That mitigates the risk these days – http://en.wikipedia.org/wiki/Transport_Layer_Security#W eb_browsers • OpenSSL 1.0.0+ doesn’t support it – Which means SSLscan won’t find it – General point: tools that dynamically link to an underlying SSL library in the OS can be limited by what that library supports SSLv2 • Same scan on different OpenSSL versions: SSLv2 • testssl.sh warns you – It can work with any installed OpenSSL version • OpenSSL <1.0.0 s_client -ssl2 switch – More on this later • Recompile OpenSSL – http://blog.opensecurityresearch.com/2013/05/fixing-sslv2-support- in-kali-linux.html • SSLyze 0.7+ is statically linked – Watch out for bug https://github.com/iSECPartners/sslyze/issues/73 -
Analysis of SSL Certificate Reissues And
Analysis of SSL Certificate Reissues and Revocations in the Wake of Heartbleed Liang Zhang David Choffnes Dave Levin Tudor Dumitra¸s Northeastern University Northeastern University University of Maryland University of Maryland [email protected] [email protected] [email protected] [email protected] Alan Mislove Aaron Schulman Christo Wilson Northeastern University Stanford University Northeastern University [email protected] [email protected] [email protected] ABSTRACT Categories and Subject Descriptors Central to the secure operation of a public key infrastruc- C.2.2 [Computer-Communication Networks]: Net- ture (PKI) is the ability to revoke certificates. While much work Protocols; C.2.3 [Computer-Communication Net- of users' security rests on this process taking place quickly, works]: Network Operations; E.3 [Data Encryption]: in practice, revocation typically requires a human to decide Public Key Cryptosystems, Standards to reissue a new certificate and revoke the old one. Thus, having a proper understanding of how often systems admin- istrators reissue and revoke certificates is crucial to under- Keywords standing the integrity of a PKI. Unfortunately, this is typi- Heartbleed; SSL; TLS; HTTPS; X.509; Certificates; Reissue; cally difficult to measure: while it is relatively easy to deter- Revocation; Extended validation mine when a certificate is revoked, it is difficult to determine whether and when an administrator should have revoked. In this paper, we use a recent widespread security vul- 1. INTRODUCTION nerability as a natural experiment. Publicly announced in Secure Sockets Layer (SSL) and Transport Layer Secu- April 2014, the Heartbleed OpenSSL bug, potentially (and rity (TLS)1 are the de-facto standards for securing Internet undetectably) revealed servers' private keys. -
A Systematic Study of Cache Side Channels Across AES Implementations
A Systematic Study of Cache Side Channels across AES Implementations Heiko Mantel1, Alexandra Weber1, and Boris K¨opf 2 1 Computer Science Department, TU Darmstadt, Darmstadt, Germany [email protected], [email protected] 2 IMDEA Software Institute, Madrid, Spain [email protected] Abstract While the AES algorithm is regarded as secure, many imple- mentations of AES are prone to cache side-channel attacks. The lookup tables traditionally used in AES implementations for storing precom- puted results provide speedup for encryption and decryption. How such lookup tables are used is known to affect the vulnerability to side chan- nels, but the concrete effects in actual AES implementations are not yet sufficiently well understood. In this article, we analyze and compare multiple off-the-shelf AES implementations wrt. their vulnerability to cache side-channel attacks. By applying quantitative program analysis techniques in a systematic fashion, we shed light on the influence of im- plementation techniques for AES on cache-side-channel leakage bounds. 1 Introduction The Advanced Encryption Standard (AES) is a widely used symmetric cipher that is approved by the U.S. National Security Agency for security-critical ap- plications [8]. While traditional attacks against AES are considered infeasible as of today, software implementations of AES are known to be highly suscepti- ble to cache side-channel attacks [5, 15, 18, 19, 32]. While such side channels can be avoided by bitsliced implementations [6,23], lookup-table-based implementa- tions, which aim at better performance, are often vulnerable and wide spread. To understand the vulnerability to cache side-channel attacks, recall that the 128bit version of AES relies on 10 rounds of transformations. -
Certificate Transparency Using Blockchain
Certicate Transparency Using Blockchain D S V Madala1, Mahabir Prasad Jhanwar1, and Anupam Chattopadhyay2 1Department of Computer Science. Ashoka University, India 2School of Computer Science and Engineering. NTU, Singapore Abstract The security of web communication via the SSL/TLS protocols relies on safe distribu- tions of public keys associated with web domains in the form of X:509 certicates. Certicate authorities (CAs) are trusted third parties that issue these certicates. However, the CA ecosystem is fragile and prone to compromises. Starting with Google's Certicate Trans- parency project, a number of research works have recently looked at adding transparency for better CA accountability, eectively through public logs of all certicates issued by certica- tion authorities, to augment the current X:509 certicate validation process into SSL/TLS. In this paper, leveraging recent progress in blockchain technology, we propose a novel system, called CTB, that makes it impossible for a CA to issue a certicate for a domain without obtaining consent from the domain owner. We further make progress to equip CTB with certicate revocation mechanism. We implement CTB using IBM's Hyperledger Fabric blockchain platform. CTB's smart contract, written in Go, is provided for complete reference. 1 Introduction The overwhelming adoption of SSL/TLS (Secure Socket Layer/Transport Layer Security Proto- cols) [4, 33] for most HTTP trac has transformed the Internet into a communication platform with strong measures of condentiality and integrity. It is one -
Public Key Distribution (And Certifications)
Lecture 12 Public Key Distribution (and Certifications) (Chapter 15 in KPS) 1 A Typical KDC-based Key Distribution Scenario KDC = Key Distribution Center KDC EK[X] = Encryption of X with key K (1) Request|B|N1 (2) E [K |Request|N |E (K ,A)] Ka s 1 Kb s (3) E [K ,A] Kb s A (4) E [A,N ] Ks 2 B Notes: (5) E [f(N )] Ks 2 • Msg2 is tied to Msg1 • Msg2 is fresh/new • Msg3 is possibly old * • Msg1 is possibly old (KDC doesn’t authenticate Alice) • Bob authenticates Alice • Bob authenticates KDC 2 • Alice DOES NOT authenticate Bob Public Key Distribution • General Schemes: • Public announcement (e.g., in a newsgroup or email message) • Can be forged • Publicly available directory • Can be tampered with • Public-key certificates (PKCs) issued by trusted off-line Certification Authorities (CAs) 3 Certification Authorities • Certification Authority (CA): binds public key to a specific entity • Each entity (user, host, etc.) registers its public key with CA. • Bob provides “proof of identity” to CA. • CA creates certificate binding Bob to this public key. • Certificate containing Bob’s public key digitally signed by CA: CA says: “this is Bob’s public key” Bob’s digital PK public signature B key PK B certificate for Bob’s CA Bob’s private SK public key, signed by identifying key CA CA information 4 Certification Authority • When Alice wants to get Bob’s public key: • Get Bob’s certificate (from Bob or elsewhere) • Using CA’s public key verify the signature on Bob’s certificate • Check for expiration • Check for revocation (we’ll talk about this later) • Extract Bob’s public key Bob’s PK B digital Public signature Key PK B CA Public PK Key CA 5 A Certificate Contains • Serial number (unique to issuer) • Info about certificate owner, including algorithm and key value itself (not shown) • info about certificate issuer • valid dates • digital signature by issuer 6 Reflection Attack and a Fix • Original Protocol 1. -
The BEAST Wins Again: Why TLS Keeps Failing to Protect HTTP Antoine Delignat-Lavaud, Inria Paris Joint Work with K
The BEAST Wins Again: Why TLS Keeps Failing to Protect HTTP Antoine Delignat-Lavaud, Inria Paris Joint work with K. Bhargavan, C. Fournet, A. Pionti, P.-Y. Strub INTRODUCTION Introduction Cookie Cutter Virtual Host Confusion Crossing Origin Boundaries Shared Session Cache Shared Reverse Proxies SPDY Connection Pooling Triple Handshake Conclusion Why do we need TLS? 1. Authentication – Must be talking to the right guy 2. Integrity – Our messages cannot be tampered 3. Confidentiality – Messages are only legible to participants 4. Privacy? – Can’t tell who we are and what we talk about Why do we need TLS? 1. Authentication – Must be talking to the right guy Active Attacks 2. Integrity (MitM) – Our messages cannot be tampered 3. Confidentiality – Messages are only legible to participants Passive Attacks 4. Privacy? (Wiretapping) – Can’t tell who we are and what we talk about What websites expect of TLS • Web attacker – Controls malicious websites – User visits honest and malicious sites in parallel – Web/MitB attacks: CSRF, XSS, Redirection… • Network attacker – Captures (passive) and tampers (active) packets What websites expect of TLS • Web attacker – Controls malicious websites – User visits honest and malicious sites in parallel – Web/MitB attacks: CSRF, XSS, Redirection… • Network attacker Strictly stronger – Captures (passive) and tampers (active) packets What websites expect of TLS If a website W served over HTTP is secure against a Web attacker, then serving W over HTTPS makes it secure against a network attacker. What websites expect of TLS If a website W served over HTTP is secure against a Web attacker, then serving W over HTTPS makes it secure against a network attacker. -
Security Economics in the HTTPS Value Chain
Security Economics in the HTTPS Value Chain Hadi Asghari*, Michel J.G. van Eeten*, Axel M. Arnbak+ & Nico A.N.M. van Eijk+1 * [email protected], [email protected] Delft University of Technology, Faculty of Technology Policy and Management + [email protected], [email protected] University van Amsterdam, Faculty of Law, Institute for Information Law Abstract. Even though we increasingly rely on HTTPS to secure Internet communications, several landmark incidents in recent years have illustrated that its security is deeply flawed. We present an extensive multi-disciplinary analysis that examines how the systemic vulnerabilities of the HTTPS authentication model could be addressed. We conceptualize the security issues from the perspective of the HTTPS value chain. We then discuss the breaches at several Certificate Authorities (CAs). Next, we explore the security incentives of CAs via the empirical analysis of the market for SSL certificates, based on the SSL Observatory dataset. This uncovers a surprising pattern: there is no race to the bottom. Rather, we find a highly concentrated market with very large price differences among suppliers and limited price competition. We explain this pattern and explore what it tells us about the security incentives of CAs, including how market leaders seem to benefit from the status quo. In light of these findings, we look at regulatory and technical proposals to address the systemic vulnerabilities in the HTTPS value chain, in particular the EU eSignatures proposal that seeks to strictly regulate HTTPS communications. Keywords: HTTPS, Cybersecurity, Internet Governance, Constitutional Values, E-Commerce, Value Chain Analysis, Security Economics, eSignatures Regulation, SSL, TLS, Digital Certificates, Certificate Authorities.