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Graph showing the progress of the XSS worm that impacted 2525 users on Justin.tv. Justin.tv was a video casting website with an active user base of approximately 20 thousand users. The cross-site scripting vulnerability that was exploited was that the "Location" profile field was not properly sanitized before its inclusion in a profile page.
Cross-site scripting (XSS) [a] is a type of security vulnerability that can be found in some web applications. XSS attacks enable attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.
HTTP header injection is a general class of web application security vulnerability which occurs when Hypertext Transfer Protocol (HTTP) headers are dynamically generated based on user input.
A URL can be crafted, for example, by linking to content that is only accessible to the user if they are logged into the target website. Including this state-dependent URL in the malicious application will initiate a cross-origin request to the target app. [ 15 ] Because the request is a cross-origin request, the same-origin policy prevents the ...
Double URI-encoding, also referred to as double percent-encoding, is a special type of double encoding in which data is URI-encoded twice in a row. [6] In other words, double-URI-encoded form of data X is URI-encode(URI-encode(X)). [7]
Example 1: Vary: * Example 2: Vary: Accept-Language; Permanent RFC 9110: Via: Informs the client of proxies through which the response was sent. Via: 1.0 fred, 1.1 example.com (Apache/1.1) Permanent RFC 9110: Warning: A general warning about possible problems with the entity body. Warning: 199 Miscellaneous warning: Obsolete [21] RFC 7234, 9111 ...
In the most frequently cited example, the first entity is the string "lol", hence the name "billion laughs". At the time this vulnerability was first reported, the computer memory used by a billion instances of the string "lol" would likely exceed that available to the process parsing the XML.
A common media type parameter is charset, specifying the character set of the media type, where the value is from the IANA list of character set names. [6] If one is not specified, the media type of the data URI is assumed to be text/plain;charset=US-ASCII. An optional base64 extension base64, separated from the preceding part by a semicolon.