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fix lack of escaping of filename in Content-Disposition - #545

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fix lack of escaping of filename in Content-Disposition#545
motoyasu-saburi wants to merge 4 commits into
form-data:masterfrom
motoyasu-saburi:fix-request-tampeing-vuln

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@motoyasu-saburi

@motoyasu-saburi motoyasu-saburi commented Apr 1, 2023

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Fixes #546

Comment thread lib/form_data.js Outdated
Comment thread test/integration/test-custom-filename.js Outdated
@ljharb
ljharb marked this pull request as draft September 19, 2024 23:22
@motoyasu-saburi
motoyasu-saburi marked this pull request as ready for review November 23, 2024 02:39
motoyasu-saburi and others added 3 commits November 23, 2024 11:41
Co-authored-by: Jordan Harband <ljharb@gmail.com>
Co-authored-by: Jordan Harband <ljharb@gmail.com>
@motoyasu-saburi

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I'm Sorry for the delay in getting back to you.

I'm having problems with CI in Automatic Rebase.
If @ljharb could please advise me, I would appreciate it.

@ljharb

ljharb commented Nov 23, 2024

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Don't worry about that check; that's failing because you merged the upstream changes instead of rebased them. I can rebase the PR later.

Comment thread lib/form_data.js
contentDisposition = 'filename="' + filename + '"';
// Escaping to prevent CRLF Injection / tampering with invalid fields.
// https://html.spec.whatwg.org/#multipart-form-data
var escapedFilename = filename.replaceAll('"', '%22')

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unfortunately replaceAll isn't available in all engines we support. what about this?

Suggested change
var escapedFilename = filename.replaceAll('"', '%22')
var escapedFilename = filename.replace(/"/g, '%22')

body += chunk;
});
req.on('end', function () {
assert(body.includes(escapedContentDispositionHeader), 'Expects encode "filename" field');

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Suggested change
assert(body.includes(escapedContentDispositionHeader), 'Expects encode "filename" field');
assert(body.indexOf(escapedContentDispositionHeader) >= 0, 'Expects encode "filename" field');

similarly, includes isn't available in everything either.

@ljharb
ljharb marked this pull request as draft November 23, 2024 06:33
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"form-data" is vulnerable to request tampering via a crafted filename

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