ruby-changes:36080
From: usa <ko1@a...>
Date: Mon, 27 Oct 2014 20:18:33 +0900 (JST)
Subject: [ruby-changes:36080] usa:r48161 (trunk): * lib/rexml/entity.rb: keep the entity size within the limitation.
usa 2014-10-27 20:18:02 +0900 (Mon, 27 Oct 2014) New Revision: 48161 http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=48161 Log: * lib/rexml/entity.rb: keep the entity size within the limitation. reported by Willis Vandevanter <will@s...> and patched by nahi. Modified files: trunk/ChangeLog trunk/lib/rexml/entity.rb trunk/test/rexml/test_document.rb trunk/test/rexml/test_entity.rb Index: ChangeLog =================================================================== --- ChangeLog (revision 48160) +++ ChangeLog (revision 48161) @@ -1,3 +1,9 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1 +Mon Oct 27 20:13:37 2014 NAKAMURA Usaku <usa@r...> + + * lib/rexml/entity.rb: keep the entity size within the limitation. + reported by Willis Vandevanter <will@s...> and + patched by nahi. + Mon Oct 27 17:17:24 2014 Nobuyoshi Nakada <nobu@r...> * proc.c (method_proc): the receiver of binding from method should Index: lib/rexml/entity.rb =================================================================== --- lib/rexml/entity.rb (revision 48160) +++ lib/rexml/entity.rb (revision 48161) @@ -138,8 +138,14 @@ module REXML https://github.com/ruby/ruby/blob/trunk/lib/rexml/entity.rb#L138 matches = @value.scan(PEREFERENCE_RE) rv = @value.clone if @parent + sum = 0 matches.each do |entity_reference| entity_value = @parent.entity( entity_reference[0] ) + if sum + entity_value.bytesize > Security.entity_expansion_text_limit + raise "entity expansion has grown too large" + else + sum += entity_value.bytesize + end rv.gsub!( /%#{entity_reference.join};/um, entity_value ) end end Index: test/rexml/test_document.rb =================================================================== --- test/rexml/test_document.rb (revision 48160) +++ test/rexml/test_document.rb (revision 48161) @@ -48,6 +48,20 @@ EOF https://github.com/ruby/ruby/blob/trunk/test/rexml/test_document.rb#L48 </member> EOF + XML_WITH_NESTED_PARAMETER_ENTITY = <<EOF +<!DOCTYPE root [ + <!ENTITY % a "BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM.BOOM."> + <!ENTITY % b "%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;%a;"> + <!ENTITY % c "%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;%b;"> + <!ENTITY % d "%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;%c;"> + <!ENTITY % e "%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;%d;"> + <!ENTITY % f "%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;%e;"> + <!ENTITY % g "%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;%f;"> + <!ENTITY test "test %g;"> +]> +<cd></cd> +EOF + XML_WITH_4_ENTITY_EXPANSION = <<EOF <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE member [ @@ -84,6 +98,19 @@ EOF https://github.com/ruby/ruby/blob/trunk/test/rexml/test_document.rb#L98 end ensure REXML::Security.entity_expansion_limit = 10000 + end + + def test_entity_expansion_limit_for_parameter_entity + assert_raise(REXML::ParseException) do + REXML::Document.new(XML_WITH_NESTED_PARAMETER_ENTITY) + end + REXML::Security.entity_expansion_limit = 100 + assert_equal(100, REXML::Security.entity_expansion_limit) + assert_raise(REXML::ParseException) do + REXML::Document.new(XML_WITH_NESTED_PARAMETER_ENTITY) + end + ensure + REXML::Security.entity_expansion_limit = 10000 end def test_tag_in_cdata_with_not_ascii_only_but_ascii8bit_encoding_source Index: test/rexml/test_entity.rb =================================================================== --- test/rexml/test_entity.rb (revision 48160) +++ test/rexml/test_entity.rb (revision 48161) @@ -123,6 +123,22 @@ module REXMLTests https://github.com/ruby/ruby/blob/trunk/test/rexml/test_entity.rb#L123 end end + def test_entity_string_limit_for_parameter_entity + template = '<!DOCTYPE bomb [ <!ENTITY % a "^" > <!ENTITY bomb "$" > ]><root/>' + len = 5120 # 5k per entity + template.sub!(/\^/, "B" * len) + + # 10k is OK + entities = '%a;' * 2 # 5k entity * 2 = 10k + REXML::Document.new(template.sub(/\$/, entities)) + + # above 10k explodes + entities = '%a;' * 3 # 5k entity * 2 = 15k + assert_raises(REXML::ParseException) do + REXML::Document.new(template.sub(/\$/, entities)) + end + end + def test_raw source = '<!DOCTYPE foo [ <!ENTITY ent "replace"> -- ML: ruby-changes@q... Info: http://www.atdot.net/~ko1/quickml/