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fix incorrect ^$ usage leading to XSS in sanitize_css [CVE-2013-1855]

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Charlie Somerville 2013-02-13 09:09:53 +11:00 committed by Aaron Patterson
parent 5dc2e3531b
commit 8be6913990
2 changed files with 8 additions and 3 deletions
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6
actionpack/lib/action_view/vendor/html-scanner/html/sanitizer.rb vendored
View file

@ -121,8 +121,8 @@ module HTML
style = style.to_s.gsub(/url\s*\(\s*[^\s)]+?\s*\)\s*/, ' ')
# gauntlet
if style !~ /^([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*$/ ||
style !~ /^(\s*[-\w]+\s*:\s*[^:;]*(;|$)\s*)*$/
if style !~ /\A([:,;#%.\sa-zA-Z0-9!]|\w-\w|\'[\s\w]+\'|\"[\s\w]+\"|\([\d,\s]+\))*\z/ ||
style !~ /\A(\s*[-\w]+\s*:\s*[^:;]*(;|$)\s*)*\z/
return ''
end
@ -133,7 +133,7 @@ module HTML
elsif shorthand_css_properties.include?(prop.split('-')[0].downcase)
unless val.split().any? do |keyword|
!allowed_css_keywords.include?(keyword) &&
keyword !~ /^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$/
keyword !~ /\A(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)\z/
end
clean << prop + ': ' + val + ';'
end

5
actionpack/test/template/html-scanner/sanitizer_test.rb
View file

@ -279,6 +279,11 @@ class SanitizerTest < ActionController::TestCase
assert_equal '', sanitize_css(raw)
end
def test_should_sanitize_across_newlines
raw = %(\nwidth:\nexpression(alert('XSS'));\n)
assert_equal '', sanitize_css(raw)
end
def test_should_sanitize_img_vbscript
assert_sanitized %(<img src='vbscript:msgbox("XSS")' />), '<img />'
end