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SECURITY: Ensure only image uploads can be inlined

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This prevents malicious files (for example special crafted XMLs) to be
used in XSS attacks.
This commit is contained in:
Dan Ungureanu 2019-12-11 15:21:41 +02:00
parent 43ddb6b36d
commit 554b0f366d
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2 changed files with 15 additions and 3 deletions
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6
app/controllers/uploads_controller.rb
View File

@ -195,10 +195,10 @@ class UploadsController < ApplicationController
content_type: MiniMime.lookup_by_filename(upload.original_filename)&.content_type
}
if params[:inline]
opts[:disposition] = "inline"
elsif !FileHelper.is_supported_image?(upload.original_filename)
if !FileHelper.is_supported_image?(upload.original_filename)
opts[:disposition] = "attachment"
elsif params[:inline]
opts[:disposition] = "inline"
end
file_path = Discourse.store.path_for(upload)

12
spec/requests/uploads_controller_spec.rb
View File

@ -296,6 +296,18 @@ describe UploadsController do
end
describe "#show_short" do
it 'inlines only supported image files' do
upload = upload_file("smallest.png")
get upload.short_path, params: { inline: true }
expect(response.header['Content-Type']).to eq('image/png')
expect(response.header['Content-Disposition']).to include('inline;')
upload.update!(original_filename: "test.xml")
get upload.short_path, params: { inline: true }
expect(response.header['Content-Type']).to eq('application/xml')
expect(response.header['Content-Disposition']).to include('attachment;')
end
describe "local store" do
fab!(:image_upload) { upload_file("smallest.png") }