Pensar - auto fix for Dangerous SVG Rendering Enables Cross-Site Scripting #10
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Fixed a Cross-Site Scripting (XSS) vulnerability in the Next.js image configuration:
Removed the
dangerouslyAllowSVG: truesetting which was disabling SVG sanitization. This setting was dangerous because it allowed SVG files to be rendered without proper sanitization, potentially executing malicious JavaScript embedded in SVG files.Added a Content Security Policy specifically for the Next.js image optimization with
contentSecurityPolicy: "default-src 'self'; script-src 'none'; sandbox;"that:default-src 'self')script-src 'none')This fix ensures that SVG files will now be properly sanitized before rendering, preventing potential execution of malicious scripts embedded in SVG content. This is particularly important in a CMS context where users can upload their own content.
More Details
Context Analysis:
- Trust Boundaries: Client-side (untrusted) interactions with media content. If user-supplied SVG files are not sanitized, they can bypass security mechanisms and execute malicious scripts in the browser.
- Data Flow Analysis: The configuration setting directly impacts how SVG files are handled when they cross from external sources into the client context.
- Security Contexts: Client-side rendering allows untrusted external SVG content to be processed unsanitized.
In this context, using this configuration setting is a true positive vulnerability since enabling dangerous SVG rendering without proper validation poses significant risk.