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Introduction:
A novel phishing attack vector has been discovered that exploits the interplay between ChatGPT’s file upload feature and its handling of SVG images. By injecting malicious CSS into an SVG file, a threat actor can craft a chat that covertly exfiltrates a user’s personal data or forces their browser to perform unauthorized, resource-intensive actions. This research underscores the evolving security challenges as AI platforms integrate more complex functionalities.
Learning Objectives:
- Understand the technical mechanism behind the SVG and CSS injection phishing vector in ChatGPT.
- Learn how to identify potentially malicious SVG files and the signs of CSS-based data exfiltration.
- Implement defensive strategies and validation techniques to mitigate similar client-side attacks.
You Should Know:
- The SVG Phishing Vector: More Than Just an Image
An SVG (Scalable Vector Graphics) file is not a simple image; it is an XML-based markup language. This means it can contain not only vector shapes but also embedded styles defined with CSS and executable JavaScript code. While ChatGPT typically sanitizes uploaded files to remove active scripts, this research found that CSS within SVGs was not being adequately neutralized. An attacker can craft an SVG with CSS that changes its appearance or behavior based on user interaction or even the content of the webpage it’s placed on.
Step-by-step guide explaining what this does and how to use it.
1. Craft the Malicious SVG: The attacker creates an SVG file. Instead of using `