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WYCIWYG
What You Cache Is What You Get (WYCIWYG) is a Uniform Resource Identifier (URI) scheme commonly displayed in the address bar of Gecko-based Web browsers like Mozilla Firefox as when the Web browser is retrieving cached information. WYCIWYG is a play on the related acronym WYSIWYG (What You See Is What You Get). Usage Mozilla Firefox implements a registered, strictly internal URI scheme to sort and later reference locally cached pages that were generated or modified by a script on the client side (a common practice for Web 2.0 sites). Security issues In 2007 Michał Zalewski reported that it was possible to bypass the same-origin checks and read from cached (wyciwyg) documents. It was possible at that time to access documents without proper same domain policy checks. This could have enabled an attacker to steal sensitive data, perform cache poisoning and execute their own code or display own content with URL bar and SSL certificate data of the original page ( URL spoofing). ...
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Michał Zalewski
Michał Zalewski (born 19 January 1981), also known by the user name lcamtuf, is a computer security expert and " white hat" hacker from Poland. He is a former Google Inc. employee (until 2018), and currently the VP of Security Engineering at Snap Inc. He has been a prolific vulnerability researcher and a frequent Bugtraq poster since the mid-1990s, and has written a number of programs for Unix-like operating systems. In 2005, Zalewski wrote ''Silence on the Wire: A Field Guide to Passive Reconnaissance and Indirect Attacks'', a computer security book published by No Starch Press and subsequently translated into a number of languages. In 2011, Zalewski wrote '' The Tangled Web: A Guide to Securing Modern Web Applications'', also published by No Starch Press. For his continued research on browser security, he was named one of the 15 most influential people in security and among the 100 most influential people in IT. Zalewski was one of the original creators of Argante, a vi ...
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Uniform Resource Identifier
A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, such as resources on a webpage, mail address, phone number, books, real-world objects such as people and places, concepts. URIs are used to identify anything described using the Resource Description Framework (RDF), for example, concepts that are part of an ontology defined using the Web Ontology Language (OWL), and people who are described using the Friend of a Friend vocabulary would each have an individual URI. URIs which provide a means of locating and retrieving information resources on a network (either on the Internet or on another private network, such as a computer filesystem or an Intranet) are Uniform Resource Locators (URLs). Therefore, URLs are a subset of URIs, i.e. every URL is a URI (and not necessarily the other way around). Other URIs provide only a unique name, without a means of locating or retr ...
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Gecko (layout Engine)
Gecko (stylized as ɢecko) is a browser engine developed by Mozilla. It is used in the Firefox browser, the Thunderbird email client, and in a discontinued state on AOL's Netscape 4, Netscape 6, Netscape 7, Netscape Browser and Netscape Navigator 9; this is alongside many other projects. Gecko is designed to support open Internet standards, and is used by different applications to display web pages and, in some cases, an application's user interface itself (by rendering XUL). Gecko offers a rich programming API that makes it suitable for a wide variety of roles in Internet-enabled applications, such as web browsers, content presentation, and client/server. Gecko is written in C++ and JavaScript, and, since 2016, additionally in Rust. It is free and open-source software subject to the terms of the Mozilla Public License version 2. Mozilla officially supports its use on Android, Linux, macOS, and Windows. History Development of the layout engine now known as Gecko began ...
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Web Browser
A web browser, often shortened to browser, is an application for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's screen. Browsers can also display content stored locally on the user's device. Browsers are used on a range of devices, including desktops, laptops, tablets, smartphones, smartwatches and consoles. As of 2024, the most used browsers worldwide are Google Chrome (~66% market share), Safari (~16%), Edge (~6%), Firefox (~3%), Samsung Internet (~2%), and Opera (~2%). As of 2023, an estimated 5.4 billion people had used a browser. Function The purpose of a web browser is to fetch content and display it on the user's device. This process begins when the user inputs a Uniform Resource Locator (URL), such as ''https://en.wikipedia.org/'', into the browser's address bar. Virtually all URLs on the Web start with either ''http:'' or ''h ...
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Mozilla Firefox
Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards. Firefox is available for Windows 10 or later versions of Windows, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems, including FreeBSD, OpenBSD, NetBSD, and other operating systems, such as ReactOS. Firefox is also available for Android and iOS. However, as with all other iOS web browsers, the iOS version uses the WebKit layout engine instead of Gecko due to platform requirements. An optimized version is also available on the Amazon Fire TV as one of the two main browsers available with Amazon's Silk Browser. Firefox is the spiritual successor of Netscape Navigator, as the Mozilla community was created by Netscape in 1998, before its acquisition ...
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Web Cache
A web cache (or HTTP cache) is a system for optimizing the World Wide Web. It is implemented both client-side and server-side. The caching of multimedia and other files can result in less overall delay when web browser, browsing the Web. Parts of the system Forward and reverse A forward cache is a cache outside the web server's network, e.g. in the client's web browser, in an ISP, or within a corporate network. A network-aware forward cache only caches heavily accessed items. A proxy server sitting between the client and web server can evaluate HTTP headers and choose whether to store web content. A reverse cache sits in front of one or more web servers, accelerating requests from the Internet and reducing peak server load. This is usually a content delivery network (CDN) that retains copies of web content at various points throughout a network. HTTP options The Hypertext Transfer Protocol (HTTP) defines three basic mechanisms for controlling caches: freshness, validation, and ...
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WYSIWYG
In computing, WYSIWYG ( ), an acronym for what you see is what you get, refers to software that allows content to be edited in a form that resembles its appearance when printed or displayed as a finished product, such as a printed document, web page, or slide presentation. WYSIWYG implies a user interface that allows the user to view something very similar to the result while the document is being created. In general, WYSIWYG implies the ability to directly manipulate the layout of a document without having to type or remember names of layout commands. History Before the adoption of WYSIWYG techniques, text appeared in editors using the system standard typeface and style with little indication of layout (margins, spacing, etc.). Users were required to enter special non-printing ''control codes'' (now referred to as markup ''code tags'') to indicate that some text should be in boldface, italics, or a different typeface or size. In this environment there was very little distincti ...
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Web 2
Web 2.0 (also known as participative (or participatory) web and social web) refers to websites that emphasize user-generated content, usability, ease of use, participatory culture, and interoperability (i.e., compatibility with other products, systems, and devices) for end users. The term was coined by Darcy DiNucci in 1999 and later popularized by Tim O'Reilly and Dale Dougherty at the first Web 2.0 Summit, Web 2.0 Conference in 2004. Although the term mimics the numbering of software versions, it does not denote a formal change in the nature of the World Wide Web, but merely describes a general change that occurred during this period as interactive websites proliferated and came to overshadow the older, more static websites of the original Web. A Web 2.0 website allows users to interact and collaborate through social media dialogue as creators of user-generated content in a virtual community. This contrasts the first generation of #Web 1.0, Web 1.0-era websites where people ...
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Cache Poisoning
Cache poisoning refers to a computer security vulnerability where invalid entries can be placed into a cache, which are then assumed to be valid when later used. Two common varieties are DNS cache poisoning and ARP cache poisoning. Web cache poisoning involves the poisoning of web cache A web cache (or HTTP cache) is a system for optimizing the World Wide Web. It is implemented both client-side and server-side. The caching of multimedia and other files can result in less overall delay when web browser, browsing the Web. Parts o ...s (which has led to security issues in programming languages, including all Python versions at the time in 2021, and expedited security updates). Attacks on other, more specific, caches also exist. References Computer security exploits Cache (computing) {{Computer-security-stub ...
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SSL Certificate
In cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the validity of a public key. The certificate includes the public key and information about it, information about the identity of its owner (called the subject), and the digital signature of an entity that has verified the certificate's contents (called the issuer). If the device examining the certificate trusts the issuer and finds the signature to be a valid signature of that issuer, then it can use the included public key to communicate securely with the certificate's subject. In email encryption, code signing, and e-signature systems, a certificate's subject is typically a person or organization. However, in Transport Layer Security (TLS) a certificate's subject is typically a computer or other device, though TLS certificates may identify organizations or individuals in addition to their core role in identifying devices. TLS, sometime ...
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URL Spoofing
A spoofed URL involves one website masquerading as another, often leveraging vulnerabilities in web browser technology to facilitate a malicious computer attack. These attacks are particularly effective against computers that lack up-to-date security patches. Alternatively, some spoofed URLs are crafted for satirical purposes. In such an attack scenario, an unsuspecting computer user visits a website and observes a familiar URL, like http://www.wikipedia.org, in the address bar. However, unbeknownst to them, the information they input is being directed to a completely different location, usually monitored by an information thief. When a fraudulent website requests sensitive information, it's referred to as phishing. These fraudulent websites often entice users through emails or hyperlinks. In a different variation, a website might resemble the original but is, in reality, a parody. These instances are generally harmless and conspicuously distinct from the genuine sites, as they ...
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Firefox
Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current and anticipated web standards. Firefox is available for Windows 10 or later versions of Windows, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems, including FreeBSD, OpenBSD, NetBSD, and other operating systems, such as ReactOS. Firefox is also available for Android and iOS. However, as with all other iOS web browsers, the iOS version uses the WebKit layout engine instead of Gecko due to platform requirements. An optimized version is also available on the Amazon Fire TV as one of the two main browsers available with Amazon's Silk Browser. Firefox is the spiritual successor of Netscape Navigator, as the Mozilla community was created by Netscape in 1998, before its acqui ...
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