fix: sanitize pdf url to prevent XSS on inline PDFs #1832
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Signed-off-by: Michael Wang <michael19920327@gmail.com>
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Yukaii
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Dec 26, 2023
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Hi team,
Consider the following example, which can trigger an alert popup when inline PDFs are unsupported (like on mobile devices):
The issue arises because PDFObject uses
innerHTMLto insert concatenated fallbackHTML, which could lead to XSS vulnerabilities. For more information, refer to pipwerks/PDFObject#296This can be seen in the code at the following locations:
https://github.com/pipwerks/PDFObject/blob/2c0bbd90d4de64598ff6df9e1af32de2d58a6eb9/pdfobject.js#L275
https://github.com/pipwerks/PDFObject/blob/2c0bbd90d4de64598ff6df9e1af32de2d58a6eb9/pdfobject.js#L323-L329
I think we should sanitize the URL before passing it to
PDFObject.embed. This approach should fix the problem.