68 lines
2.3 KiB
Diff
68 lines
2.3 KiB
Diff
From 1b8fd33c3120bfc6e5164b449e2c2fc9c9306fde Mon Sep 17 00:00:00 2001
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From: Thomas Leitner <t_leitner@gmx.at>
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Date: Sat, 27 Jun 2020 14:47:21 +0200
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Subject: [PATCH 1/2] Add option forbidden_inline_options
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It is sometimes necessary to restrict the options that can be set
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inline, ie. using the {::options ...} extensions.
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By default, the template option is now forbidden to avoid possible
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security problems. This addresses CVE-2020-14001.
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---
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lib/kramdown/options.rb | 10 ++++++++++
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lib/kramdown/parser/kramdown/extensions.rb | 6 ++++++
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test/testcases/block/12_extension/options.text | 2 ++
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3 files changed, 18 insertions(+)
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diff --git a/lib/kramdown/options.rb b/lib/kramdown/options.rb
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index ea67913..0214e28 100644
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--- a/lib/kramdown/options.rb
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+++ b/lib/kramdown/options.rb
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@@ -589,6 +589,16 @@ module Kramdown
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Used by: HTML converter
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EOF
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+ define(:forbidden_inline_options, Object, %w[template], <<~EOF) do |val|
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+ Defines the options that may not be set using the {::options} extension
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+
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+ Default: template
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+ Used by: HTML converter
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+ EOF
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+ val.map! {|item| item.kind_of?(String) ? str_to_sym(item) : item }
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+ simple_array_validator(val, :forbidden_inline_options)
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+ end
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+
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end
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end
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diff --git a/lib/kramdown/parser/kramdown/extensions.rb b/lib/kramdown/parser/kramdown/extensions.rb
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index 493dcf7..637d0fa 100644
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--- a/lib/kramdown/parser/kramdown/extensions.rb
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+++ b/lib/kramdown/parser/kramdown/extensions.rb
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@@ -110,6 +110,12 @@ module Kramdown
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opts.select do |k, v|
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k = k.to_sym
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if Kramdown::Options.defined?(k)
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+ if @options[:forbidden_inline_options].include?(k) ||
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+ k == :forbidden_inline_options
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+ warning("Option #{k} may not be set inline")
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+ next false
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+ end
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+
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begin
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val = Kramdown::Options.parse(k, v)
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@options[k] = val
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diff --git a/test/testcases/block/12_extension/options.text b/test/testcases/block/12_extension/options.text
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index 5991ab7..b63f34b 100644
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--- a/test/testcases/block/12_extension/options.text
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+++ b/test/testcases/block/12_extension/options.text
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@@ -19,3 +19,5 @@ some <span>*para*</span>
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Some text[^ab].
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[^ab]: Some text.
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+
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+{::options template="/etc/passwd" /}
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--
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2.26.2
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