36 lines
1,001 B
Ruby
36 lines
1,001 B
Ruby
require 'rexml/document'
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require 'rexml/entity'
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# Fixes the rexml vulnerability disclosed at:
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# http://www.ruby-lang.org/en/news/2008/08/23/dos-vulnerability-in-rexml/
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# This fix is identical to rexml-expansion-fix version 1.0.1
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unless REXML::VERSION > "3.1.7.2"
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module REXML
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class Entity < Child
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undef_method :unnormalized
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def unnormalized
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document.record_entity_expansion! if document
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v = value()
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return nil if v.nil?
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@unnormalized = Text::unnormalize(v, parent)
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@unnormalized
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end
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end
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class Document < Element
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@@entity_expansion_limit = 10_000
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def self.entity_expansion_limit= val
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@@entity_expansion_limit = val
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end
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def record_entity_expansion!
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@number_of_expansions ||= 0
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@number_of_expansions += 1
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if @number_of_expansions > @@entity_expansion_limit
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raise "Number of entity expansions exceeded, processing aborted."
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end
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end
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end
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end
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end
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