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Fix polynomial ReDoS in regexify alternation matching #3276

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Fix polynomial ReDoS in regexify alternation matching #3276

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2 changes: 1 addition & 1 deletion lib/faker.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,7 @@ def regexify(reg)
.gsub(/(\[[^\]]++\])\{(\d+),(\d+)\}/) { |_match| Regexp.last_match(1) * sample(Array(Range.new(Regexp.last_match(2).to_i, Regexp.last_match(3).to_i))) } # [12]{1,2} becomes [12] or [12][12]
.gsub(/(\([^)]++\))\{(\d+),(\d+)\}/) { |_match| Regexp.last_match(1) * sample(Array(Range.new(Regexp.last_match(2).to_i, Regexp.last_match(3).to_i))) } # (12|34){1,2} becomes (12|34) or (12|34)(12|34)
.gsub(/(\\?.)\{(\d+),(\d+)\}/) { |_match| Regexp.last_match(1) * sample(Array(Range.new(Regexp.last_match(2).to_i, Regexp.last_match(3).to_i))) } # A{1,2} becomes A or AA or \d{3} becomes \d\d\d
.gsub(/\((.*?)\)/) { |match| sample(match.gsub(/[()]/, '').split('|')) } # (this|that) becomes 'this' or 'that'
.gsub(/\(([^()]*)\)/) { |match| sample(match.gsub(/[()]/, '').split('|')) } # (this|that) becomes 'this' or 'that'
.gsub(/\[([^\]]++)\]/) { |match| match.gsub(/(\w-\w)/) { |range| sample(Array(Range.new(*range.split('-')))) } } # All A-Z inside of [] become C (or X, or whatever)
.gsub(/\[([^\]]++)\]/) { |_match| sample(Regexp.last_match(1).chars) } # All [ABC] become B (or A or C)
.gsub('\d') { |_match| sample(Numbers) }
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3 changes: 2 additions & 1 deletion test/test_faker.rb
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Expand Up @@ -27,7 +27,8 @@ def test_letterify
def test_regexify
{
'uk post code' => /^([A-PR-UWYZ0-9][A-HK-Y0-9][AEHMNPRTVXY0-9]?[ABEHMNPRVWXY0-9]? {1,2}[0-9][ABD-HJLN-UW-Z]{2}|GIR 0AA)$/,
'us phone' => /^(1-?)[2-8][0-1][0-9]-\d{3}-\d{4}$/
'us phone' => /^(1-?)[2-8][0-1][0-9]-\d{3}-\d{4}$/,
'alternation group' => /^(foo|bar|baz)$/
}.each do |label, re|
deterministically_verify -> { Faker::Base.regexify(re) } do |result|
assert_match re, result, "#{result} is not a match for #{label}"
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