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Hsivonen jun 7 13 at 1332 3 moral of the story. If your web application displays image files submitted by an external party you should take special care about how you handle imagesvgxml. Then focusing on the animate tag i found an interesting xss vector using the values attribute.
svg vector xss

The below code is an example of a basic svg file that will show a picture of a rectangle.

Svg vector xss. The values attribute lets you specify a number of values for an svg animation separated by semi colons. Fwiw we did this because the svg wg wanted the xml serialization of svg to be copyable and pasteable into the html serialization in a text editor. Svg images and their behaviors are defined in xml text files. Recently i have read about a neat idea of bypassing waf by inserting a javascript url in the middle of the values attribute of the animate tagmost of wafs can easily extract attributes values and then detect malicious payloads inside them for example.

Always sanitize user provided markup by parsing with a real html parser applying a whitelist based sanitizer to the parser output and re. Scalable vector graphicssvg is an xml based vector image format for two dimensional graphics with support for interactivity and animation. Xss vectors cheat sheet. Denial of service the new svg billion laughs attack.

Was converted into java script which renders in ie netscape 81 in secure site mode and opera. Svg on the web. Svg which stands for scalable vector graphics 1 is an xml based vector image format for two dimensional graphics with support for interactivity and animation. I actually used a similar attack vector against a several separate real world xss filters by using the conversion filter itself here is an example to help create the attack vector ie.

I added a couple of known xss vectors to the cheat sheet using those tags. Scalable vector graphics and xss written 10 years ago by mike cardwell. Lets assume that a website has a file upload function. Interactive cross site scripting xss cheat sheet for 2020 brought to you by portswigger.

For the sake of security the creator of the website decides solely on the ability to load graphic files including svg files. Svg image files can contain css and more importantly javascript. Instantly share code notes and snippets. Javascriptalert1the research is based on the fact that the values attribute may contain multiple values each separated by a.

There are numerous ways to locate xss vulnerabilities svg files are normally overlooked. Such opportunity provides svg files that describe vector graphics in modern browsers. Actively maintained and regularly updated with new vectors.

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