Cross Site Scripting in CSS Stylesheets: Possibilities and Techniques
Cross-site scripting (XSS) is a web security vulnerability that allows attackers to inject malicious scripts into a web page, potentially compromising user data and account access. While XSS commonly targets JavaScript execution, it can also be exploited through CSS stylesheets.
Using CSS Stylesheets for XSS
In specific CSS implementations, it is possible to include JavaScript code within stylesheet files. Three primary methods have been identified:
Real-World Examples
A notable example of XSS via CSS stylesheets can be found in Firefox's use of XBL (Extensible Binding Language). It permitted the injection of JavaScript via CSS from files within the same domain.
Another technique described by ScaryBeastSecurity exploits the CSS parser to steal content from different domains, leveraging a vulnerability in how CSS handles cross-domain requests.
Protecting Against CSS XSS
To mitigate the risk of XSS via CSS stylesheets, several measures can be implemented:
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