CSS sanitizer allows vmax length unit

vmax 1% of the viewport's larger dimension. https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Values_and_units#Relative_length_units
flavorjones · Nov 26, 2019 · bab56b5 · bab56b5
1 parent 24fcb17
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diff --git a/lib/loofah/html5/scrub.rb b/lib/loofah/html5/scrub.rb
@@ -6,7 +6,7 @@ module Loofah
   module HTML5 # :nodoc:
     module Scrub
       CONTROL_CHARACTERS = /[`\u0000-\u0020\u007f\u0080-\u0101]/
-      CSS_KEYWORDISH = /\A(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|-?\d{0,3}\.?\d{0,10}(ch|cm|r?em|ex|in|lh|mm|pc|pt|px|Q|vmin|vw|vh|%|,|\))?)\z/
+      CSS_KEYWORDISH = /\A(#[0-9a-fA-F]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|-?\d{0,3}\.?\d{0,10}(ch|cm|r?em|ex|in|lh|mm|pc|pt|px|Q|vmax|vmin|vw|vh|%|,|\))?)\z/
       CRASS_SEMICOLON = { :node => :semicolon, :raw => ";" }
 
       class << self

diff --git a/test/html5/test_sanitizer.rb b/test/html5/test_sanitizer.rb
@@ -335,6 +335,12 @@ def test_css_vmin_value
     assert_match %r/42vmin/, sane.inner_html
   end
 
+  def test_css_vmax_value
+    html = "<div style=\"width: 42vmax;\"></body>"
+    sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :escape).to_xml)
+    assert_match %r/42vmax/, sane.inner_html
+  end
+
   def test_css_function_sanitization_leaves_safelisted_functions_calc
     html = "<span style=\"width:calc(5%)\">"
     sane = Nokogiri::HTML(Loofah.scrub_fragment(html, :strip).to_html)