The Web's Security Model
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
The Web Never Forgets: Persistent Tracking Mechanisms in the Wild
The Web Never Forgets: Persistent Tracking Mechanisms in the Wild Gunes Acar1, Christian Eubank2, Steven Englehardt2, Marc Juarez1 Arvind Narayanan2, Claudia Diaz1 1KU Leuven, ESAT/COSIC and iMinds, Leuven, Belgium {name.surname}@esat.kuleuven.be 2Princeton University {cge,ste,arvindn}@cs.princeton.edu ABSTRACT 1. INTRODUCTION We present the first large-scale studies of three advanced web tracking mechanisms — canvas fingerprinting, evercookies A 1999 New York Times article called cookies compre and use of “cookie syncing” in conjunction with evercookies. hensive privacy invaders and described them as “surveillance Canvas fingerprinting, a recently developed form of browser files that many marketers implant in the personal computers fingerprinting, has not previously been reported in the wild; of people.” Ten years later, the stealth and sophistication of our results show that over 5% of the top 100,000 websites tracking techniques had advanced to the point that Edward employ it. We then present the first automated study of Felten wrote “If You’re Going to Track Me, Please Use Cook evercookies and respawning and the discovery of a new ev ies” [18]. Indeed, online tracking has often been described ercookie vector, IndexedDB. Turning to cookie syncing, we as an “arms race” [47], and in this work we study the latest present novel techniques for detection and analysing ID flows advances in that race. and we quantify the amplification of privacy-intrusive track The tracking mechanisms we study are advanced in that ing practices due to cookie syncing. they are hard to control, hard to detect and resilient Our evaluation of the defensive techniques used by to blocking or removing. -
Do Not Track a Nokia Browser Look
Do Not Track Nokia Browser Position - Vikram Malaiya Copyright: Nokia Corporation, 2011 Our understanding of Do Not Track (DNT) • DNT is a technology to enables users to opt out of third-party web tracking • No agreed upon definition of DNT. There are currently 3 major technology proposals for responding to third-party privacy concern. 1. Stanford University and Mozilla’s DNT HTTP Header technique. 2. Blacklist based technique such as Microsoft’s ‘Tracking Protection’ which is part of IE9 3. Network Advertising Initiative’s model of a per company opt-out cookie. Opt-out cookie approach is being promoted by Google. DNT as HTTP Header The Browser adds ‘DNT’/ ‘X-Do-Not-Track’ to its http header. The header is sent out to the server with every web request. This header acts as a signal to the server suggesting that the user wishes to opt out of tracking. Adoption: Firefox 4, IE9 DNT as HTTP Header • Pros: – Scope: Server could apply restrictions to all third party entities and tracking mechanisms – Persistent: No reconfiguration needed once set – Simple: Easy to implement on the browser side • Cons: – Only work as long as the server honors users preferences – No way to enforce national regulations/legislations to servers located beyond country boundaries Block(Black) List / Tracking Protection This is a consumer opt-in mechanism which blocks web connections from known tracking domains that are compiled on a list. First party Third party Adoption: ‘Tracking Protection’ in Internet Explorer 9 cy.analytix.com The downloadable Tracking allow Protection Lists enable IE9 xy.ads.com consumers to control what deny third-party site content can deny track them when they’re ads.tracker.com Tracking Protection online. -
M3AAWG Best Common Practices for Mitigating Abuse of Web Messaging Systems, Version 1.1 Updated March 2019 (2010)
Messaging, Malware and Mobile Anti-Abuse Working Group (M3AAWG) M3AAWG Best Common Practices for Mitigating Abuse of Web Messaging Systems, Version 1.1 Updated March 2019 (2010) The reference URL for this document is www.m3aawg.org/WebMessagingAbuse Table of Contents Updated in this Version ......................................................................................................................................................... 1 Introduction ........................................................................................................................................................................... 1 Typical Attacks ...................................................................................................................................................................... 2 Monitoring and Alerting ....................................................................................................................................................... 2 Proactive Defense .................................................................................................................................................................. 3 UI Access ........................................................................................................................................................................................................... 3 Web Application Security .............................................................................................................................................................................. -
Cross-Domain Communications
CSE 361: Web Security Cross-domain Communication Nick Nikiforakis 2 A World Without Separation between Sites http://kittenpics.org https://gmail.com 3 The Same-Origin Policy for JavaScript • Most basic access control policy • controls how active content can access resources • Same-Origin Policy for JavaScript for three actions • Script access to other document in same browser • frames/iframes • (popup) windows • Script access to application-specific local state • cookies, Web Storage, or IndexedDB • Explicit HTTP requests to other hosts • XMLHttpRequest 4 The Same-Origin Policy for JavaScript • Only allows access if origins match Protocol Hostname Port • Origin defined by protocol, hostname, and port http://example.org:80/path/ Originating document Accessed document Non-IE Browser Internet Explorer http://example.org/a http://example.org/b http://example.org http://www.example.org http://example.org https://example.org http://example.org http://example.org:81 5 Domain Relaxation • Two sub-domains of a common parent domain want to communicate • Notably: can overwrite different port! • Browsers allow setting document.domain property • Can only be set to valid suffix including parent domain • test.example.org -> example.org ok • example.org -> org forbidden • When first introduced, relaxation of single sub-domain was sufficient • Nowadays: both (sub-)domains must explicitly set document.domain 6 Domain Relaxation http://sub.kittenpics.org http://kittenpics.org document.domain = "kittenpics.org" document.domain = "kittenpics.org" 7 Domain Relaxation http://sub.kittenpics.org http://kittenpics.org document.domain = "kittenpics.org" Cross-Origin Communication 9 Cross-origin communication • Subdomains of the same domain can use domain relaxation when they want to talk to one another. -
Bibliography of Erik Wilde
dretbiblio dretbiblio Erik Wilde's Bibliography References [1] AFIPS Fall Joint Computer Conference, San Francisco, California, December 1968. [2] Seventeenth IEEE Conference on Computer Communication Networks, Washington, D.C., 1978. [3] ACM SIGACT-SIGMOD Symposium on Principles of Database Systems, Los Angeles, Cal- ifornia, March 1982. ACM Press. [4] First Conference on Computer-Supported Cooperative Work, 1986. [5] 1987 ACM Conference on Hypertext, Chapel Hill, North Carolina, November 1987. ACM Press. [6] 18th IEEE International Symposium on Fault-Tolerant Computing, Tokyo, Japan, 1988. IEEE Computer Society Press. [7] Conference on Computer-Supported Cooperative Work, Portland, Oregon, 1988. ACM Press. [8] Conference on Office Information Systems, Palo Alto, California, March 1988. [9] 1989 ACM Conference on Hypertext, Pittsburgh, Pennsylvania, November 1989. ACM Press. [10] UNIX | The Legend Evolves. Summer 1990 UKUUG Conference, Buntingford, UK, 1990. UKUUG. [11] Fourth ACM Symposium on User Interface Software and Technology, Hilton Head, South Carolina, November 1991. [12] GLOBECOM'91 Conference, Phoenix, Arizona, 1991. IEEE Computer Society Press. [13] IEEE INFOCOM '91 Conference on Computer Communications, Bal Harbour, Florida, 1991. IEEE Computer Society Press. [14] IEEE International Conference on Communications, Denver, Colorado, June 1991. [15] International Workshop on CSCW, Berlin, Germany, April 1991. [16] Third ACM Conference on Hypertext, San Antonio, Texas, December 1991. ACM Press. [17] 11th Symposium on Reliable Distributed Systems, Houston, Texas, 1992. IEEE Computer Society Press. [18] 3rd Joint European Networking Conference, Innsbruck, Austria, May 1992. [19] Fourth ACM Conference on Hypertext, Milano, Italy, November 1992. ACM Press. [20] GLOBECOM'92 Conference, Orlando, Florida, December 1992. IEEE Computer Society Press. http://github.com/dret/biblio (August 29, 2018) 1 dretbiblio [21] IEEE INFOCOM '92 Conference on Computer Communications, Florence, Italy, 1992. -
Browser Security Features
Browser Security features Michael Sonntag Institute of Networks and Security Cookies: Securing them Attention: These are “requests” by the server setting the cookie Browsers will follow them, but applications not necessarily Secure/HTTPS-only: Do not send unencrypted This is an element of the Cookie header itself “Set-Cookie: “ …content, domain, expiration… “;Secure” Often the application contains an option to set this automatically HTTP-only: No access by JavaScript This is an element of the Cookie header itself “Set-Cookie: “ …content, domain, expiration… “;HttpOnly” Host-only: Do not set the “Domain” attribute Not set: Send to exactly this host only Domain set: Send to every host at or under this domain Priority: When too many cookies from a single domain, delete those of low priority first Not really a security feature! 2 Cookies: Securing them SameSite: Cookie should not be sent with cross-site requests (some CSRF-prevention; prevent cross-origin information leakage) “Strict” : Never cross origin; not even when clicking on a link on site A leading to B the Cookie set from B is actually sent to B “Lax” (default): Sent when clicking on most links, but not with POST requests: “Same-Site” and “cross-site top-level navigation” Not as good as strict: E.g. “<link rel='prerender’>” is a same-site request fetched automatically (and kept in the background!) Sent: GET requests leading to a top-level target (=URL in address bar changes; but may contain e.g. path) I.e.: Will not be sent for iframes, images, XMLHttpRequests -
Statement of Justin Brookman Director, Consumer Privacy Center for Democracy & Technology Before the U.S. Senate Committee O
Statement of Justin Brookman Director, Consumer Privacy Center for Democracy & Technology Before the U.S. Senate Committee on Commerce, Science, and Transportation Hearing on “A Status Update on the Development of Voluntary Do-Not-Track Standards” April 24, 2013 Chairman Rockefeller, Ranking Member Thune, and Members of the Committee: On behalf of the Center for Democracy & Technology (CDT), I thank you for the opportunity to testify today. We applaud the leadership the Chairman has demonstrated in examining the challenges in developing a consensus Do Not Track standard and appreciate the opportunity to address the continued insufficiency of self-regulatory consumer privacy protections. CDT is a non-profit, public interest organization dedicated to preserving and promoting openness, innovation, and freedom on the decentralized Internet. I currently serve as the Director of CDT’s Consumer Privacy Project. I am also an active participant in the Worldwide Web Consortium’s Tracking Protection Working Group, where I serve as editor of the “Tracking Compliance and Scope” specification — the document that purports to define what Do Not Track should mean. My testimony today will briefly describe the history of online behavioral advertising and the genesis of the Do Not Track initiative. I will then describe the current state of the World Wide Web Consortium’s efforts to create Do Not Track standards and the challenges going forward to implement Do Not Track tools successfully. I will conclude with my thoughts on the future of Do Not Track. and why I believe that this protracted struggle demonstrates the need for the fundamental reform of our nation’s privacy protection framework for commercial and government collection and use of personal information. -
Amazon Silk Developer Guide Amazon Silk Developer Guide
Amazon Silk Developer Guide Amazon Silk Developer Guide Amazon Silk: Developer Guide Copyright © 2015 Amazon Web Services, Inc. and/or its affiliates. All rights reserved. The following are trademarks of Amazon Web Services, Inc.: Amazon, Amazon Web Services Design, AWS, Amazon CloudFront, AWS CloudTrail, AWS CodeDeploy, Amazon Cognito, Amazon DevPay, DynamoDB, ElastiCache, Amazon EC2, Amazon Elastic Compute Cloud, Amazon Glacier, Amazon Kinesis, Kindle, Kindle Fire, AWS Marketplace Design, Mechanical Turk, Amazon Redshift, Amazon Route 53, Amazon S3, Amazon VPC, and Amazon WorkDocs. In addition, Amazon.com graphics, logos, page headers, button icons, scripts, and service names are trademarks, or trade dress of Amazon in the U.S. and/or other countries. Amazon©s trademarks and trade dress may not be used in connection with any product or service that is not Amazon©s, in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by Amazon. AWS documentation posted on the Alpha server is for internal testing and review purposes only. It is not intended for external customers. Amazon Silk Developer Guide Table of Contents What Is Amazon Silk? .................................................................................................................... 1 Split Browser Architecture ...................................................................................................... -
A Trusted Infrastructure for Symbolic Analysis of Event-Driven Web
A Trusted Infrastructure for Symbolic Analysis of Event-Driven Web Applications Gabriela Sampaio Imperial College London, UK [email protected] José Fragoso Santos INESC-ID/Instituto Superior Técnico, Universidade de Lisboa, Portugal Imperial College London, UK [email protected] Petar Maksimović Imperial College London, UK [email protected] Philippa Gardner Imperial College London, UK [email protected] Abstract We introduce a trusted infrastructure for the symbolic analysis of modern event-driven Web applica- tions. This infrastructure consists of reference implementations of the DOM Core Level 1, DOM UI Events, JavaScript Promises and the JavaScript async/await APIs, all underpinned by a simple Core Event Semantics which is sufficiently expressive to describe the event models underlying these APIs. Our reference implementations are trustworthy in that three follow the appropriate standards line-by-line and all are thoroughly tested against the official test-suites, passing all the applicable tests. Using the Core Event Semantics and the reference implementations, we develop JaVerT.Click, a symbolic execution tool for JavaScript that, for the first time, supports reasoning about JavaScript programs that use multiple event-related APIs. We demonstrate the viability of JaVerT.Click by proving both the presence and absence of bugs in real-world JavaScript code. 2012 ACM Subject Classification Software and its engineering → Formal software verification; Software and its engineering → Software testing and debugging Keywords and phrases Events, DOM, JavaScript, promises, symbolic execution, bug-finding Digital Object Identifier 10.4230/LIPIcs.ECOOP.2020.28 Acknowledgements Fragoso Santos, Gardner, and Maksimović were partially supported by the EPSRC Programme Grant ‘REMS: Rigorous Engineering for Mainstream Systems’ (EP/K008528/1) and the EPSRC Fellowship ‘VetSpec: Verified Trustworthy Software Specification’ (EP/R034567/1). -
Web Application Security Standards
WEB APPLICATION SECURITY STANDARDS It is much more secure to be feared than to be loved. www.ideas2it.com Security Headers ● Content-Security-Policy ○ Reduce XSS risks on modern browsers ● X-Content-Type-Options ○ Prevent browsers from trying to guess (“sniff”) the MIME type ● X-XSS-Protection ○ Stops pages from loading when they detect reflected cross-site scripting (XSS) ● X-Frame-Options ○ Prevent the site from clickjacking attacks www.ideas2it.com Security Headers ● Strict-Transport-Security ○ Lets a website tell browsers that it should only be accessed using HTTPS ● Referrer-Policy ○ Controls how much referrer information (sent via the Referer header) should be included with requests. ● Feature-policy ○ Provides a mechanism to allow and deny the use of browser features. www.ideas2it.com Request : digicontent.com/assets/css/styles.css Request : digicontent.com/assets/js/filter.js Request : malicious.com/assets/js/xss.js Content-Security-Policy: default-src digicontent.com Content Security Policy Browser Asset Sniff asset to determine MIME type Based on content MIME type = HTML MIME Sniffing HSTS enabled Client origin server Request : http://digicontent.com Response : https://digicontent.com HTTP Strict Transport Security Cross Site Scripting - XSS ● Stealing other user’s cookies ● Stealing their private information ● Performing actions on behalf of other users ● Redirecting to other websites ● Showing ads in hidden IFRAMES and pop-ups www.ideas2it.com Cross Site Scripting (XSS) Secure cache control settings ● Max-age ● No-cache ● No-store ● Public ● Private ● Must-Revalidate ● Proxy-Revalidate www.ideas2it.com Request : digicontent.com/styles.css digicontent.com/styles.css Cache-Control : max-age = 3600 3600s Receive styles.css Store styles.css Browser Cache Cache-Control www.ideas2it.com Cookie attributes ● HTTP-ONLY ● SECURE ● Domain ● SameSite (Strict/Lax/None) ● Path www.ideas2it.com Cookie : Same Site Vulnerable TLS SSL vs. -
Get Started with HTML5 ● Your Best Bet to Experiment with HTML5 – Safari – Chrome As of – Beta: Firefox 4 and IE 9
BibhasBibhas BhattacharyaBhattacharya CTO,CTO, WebWeb AgeAge SolutionsSolutions [email protected]@webagesolutions.com www.webagesolutions.com/trainingwww.webagesolutions.com/training Get Started With HTML5 ● Your best bet to experiment with HTML5 – Safari – Chrome As of – Beta: FireFox 4 and IE 9. October 2010 ● Test your browser: – html5test.com – html5demos.com – www.findmebyip.com/litmus ● JavaScript library to test for HTML5 features – www.modernizr.com Browser Support ● Dreamweaver CS5 11.0.3 update will install HTML5 compatibility pack. ● CS4 and CS3 users should download the pack from Dreamweaver Exchange. ● See a demo: – www.youtube.com/watch?v=soNIxy2sj0A DreamWeaver Story - The canvas element - Custom audio & video player - New semantic elements - Geolocation (header, section, footer etc.) - Local data storage - New form input elements - Web SQL & IndexedDB (e-mail, date, time etc.) - Offline apps - Audio and video - Messaging - CSS3 - Web worker - Push using WebSocket For web page designers For developers What's New in HTML5? SimplifiedSimplified <!DOCTYPE html> DOCTYPEDOCTYPE <html> <head> <title>Page Title</title> Simplified <meta charset="UTF-8"> Simplified charsetcharset settingsetting </head> <body> <p>Hello World</p> </body> </html> Basic HTML 5 Document ● Elements that have no special visual styling but are used to provide structure and meaning to the content. ● HTML4 semantic elements – div (block) – span (in line) ● HTML5 semantic elements – header, footer, section, article, aside, time and others.. -
Web Application Report
Web Application Report This report includes important security information about your web application. Security Report This report was created by IBM Security AppScan Standard 9.0.3.13, Rules: 18533 Scan started: 6/2/2020 10:39:20 AM Table of Contents Introduction General Information Login Settings Summary Issue Types Vulnerable URLs Fix Recommendations Security Risks Causes WASC Threat Classification Issues Sorted by Issue Type Cross-Site Scripting 28 Link to Non-Existing Domain Found 2 SQL Injection File Write (requires user verification) 1 Check for SRI (Subresource Integrity) support 1 Credit Card Number Pattern Found (Visa) Over Unencrypted Connection 1 Google Sitemap File Detected 1 Hidden Directory Detected 6 Missing or insecure "Content-Security-Policy" header 5 Unsafe third-party link (target="_blank") 22 Fix Recommendations Remove the non-existing domain from the web site Review possible solutions for hazardous character injection Add the attribute rel = "noopener noreferrer" to each link element with target="_blank" 6/3/2020 1 Add to each third-party script/link element support to SRI(Subresource Integrity). Config your server to use the "Content-Security-Policy" header with secure policies Issue a "404 - Not Found" response status code for a forbidden resource, or remove it completely Remove credit card numbers from your website Validate that your Google Sitemap file only contains URLs that should be publicly available and indexed Advisories Cross-Site Scripting Link to Non-Existing Domain Found SQL Injection File Write (requires user verification) Check for SRI (Subresource Integrity) support Credit Card Number Pattern Found (Visa) Over Unencrypted Connection Google Sitemap File Detected Hidden Directory Detected Missing or insecure "Content-Security-Policy" header TargetBlankLink Application Data Cookies JavaScripts Parameters Comments Visited URLs Failed Requests Filtered URLs 6/3/2020 2 Introduction This report contains the results of a web application security scan performed by IBM Security AppScan Standard.