You can contribute to this cheat sheet by creating a new issue or updating the JSON and creating a pull request Java technology is quite widely used, therefore there are many solutions to it. If you are using Spring technology and would like to escape HTML for the whole application, then you have to write the appropriate code in the project’s web.xml file. defaultHtmlEscapetrue So I've been toying around with HTTP for fun in telnet now (i.e. just typing in telnet google.com 80 and putting in random GETs and POSTs with different headers and the like) but I've come across something that google.com transmits in it's headers that I don't know.

As already discussed, filtering and character escaping are the main prevention methods. However, it can be performed differently in different programming languages. Some programming languages have appropriate filtering libraries and some do not. Contributor(s): Jim Manico, Jeff Williams, Dave Wichers, Adar Weidman, Roman, Alan Jex, Andrew Smith, Jeff Knutson, Imifos, Erez Yalon, kingthorin, Vikas Khanna. Grant Ongers Encode any character that can affect the execution context, whether it indicates the start of a script, event, or CSS style, using a function like htmlentities(). The context of this lab inside an attribute with a length limitation of 14 characters. We came up with a vector that executes JavaScript in 15 characters:"oncut=alert``+ the plus is a trailing space. Do you think you can beat it?

The closest we've got to solving this is when you have multiple injection points. The first within a script based context and the second in HTML.

The data is included in dynamic content that is sent to a web user without being validated for malicious content. This lab captures the scenario when you can't use an open tag followed by an alphanumeric character. Sometimes you can solve this problem by bypassing the WAF entirely, but what about when that's not an option? Certain versions of .NET have this behaviour, and it's only known to be exploitable in old IE with <%tag. Set-Cookie: PREF=ID=6ddbc0a0342e7e63:FF=0:TM=1328067744:LM=1328067744:S=4d4farvCGl5Ww0C3; expires=Fri, 31-Jan-2014 03:42:24 GMT; path=/; domain=.google.com In addition, don’t try to encode the output manually. Use element.textContent to display user-provided content, like in the following example provided by OWASP: Another possible prevention method is character escape. In this practice, appropriate characters are being changed by special codes. For Example,< escaped character may look like <. It is important to know that we can find appropriate libraries to escape the characters.P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info." The injection occurs within a single quoted string and the challenge is to execute arbitrary code using the charset a-zA-Z0-9'+.`. Luan Herrera solved this lab in an amazing way, you can view the solution in the following post.

When inserting into the HTML attribute subcontext in the execution context do JavaScript escape before it. img src="http://url.to.file.which/not.exist" onerror=alert(document.cookie);> XSS Using Script Via Encoded URI Schemes To find out what these are for, please refer to Documenting the impossible: Unexploitable XSS labs. Title Typically, this comments field should have configurations to validate the data before it’s sent to the database. var App = Mn.Application.extend({region: '#app', onStart: function() {this.showView(new View());}});

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HTTP stands for Hypertext transfer protocol and defines how messages are formatted and transmitted over the internet. Web developers may wish to disable the filter for their content. They can do so by setting an HTTP header: X-XSS-Protection: 0 This way the DOM environment is being affected. Of course, instead of this simple script, something more harmful may also be entered. How to Test Against XSS?

Another good prevention method is user input filtering. The idea of the filtering is to search for risky keywords in the user’s input and remove them or replace them with empty strings. When an external.jar file is added to the project, it also has to be described in the web.xml file: XSSFiltercom.cj.xss.XSSFilter I've been looking through http://www.w3.org/Protocols/rfc2616/rfc2616.html and have found no definition for this particular http-header that google seems to be spouting out: GET / HTTP/1.1 Always add quotes to your attributes, because quoted attributes can only be escaped with the corresponding quote. As a general rule, escape all non-alphanumeric characters.

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Bright can automatically crawl your applications to test for reflected, stored and DOM-based XSS vulnerabilities, giving you maximum coverage, seamlessly integrated across development pipelines. In this case, some developers write their own code to search for appropriate keywords and remove them. However, the easier way would be to select an appropriate programming language library to filter the user’s input. I would like to comment, that using libraries is a more reliable way, as those libraries were used and tested by many developers. Avoid including any volatile data (any parameter/user input) in event handlers and JavaScript code subcontexts in an execution context.