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26 lines
913 B
Plaintext
26 lines
913 B
Plaintext
/**
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* @name Inefficient regular expression
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* @description A regular expression that requires exponential time to match certain inputs
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* can be a performance bottleneck, and may be vulnerable to denial-of-service
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* attacks.
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* @kind problem
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* @problem.severity error
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* @security-severity 7.5
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* @precision high
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* @id js/redos
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* @tags security
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* external/cwe/cwe-1333
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* external/cwe/cwe-730
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* external/cwe/cwe-400
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*/
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import javascript
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private import semmle.javascript.security.regexp.RegExpTreeView::RegExpTreeView as TreeView
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import codeql.regex.nfa.ExponentialBackTracking::Make<TreeView>
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from RegExpTerm t, string pump, State s, string prefixMsg
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where hasReDoSResult(t, pump, s, prefixMsg)
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select t,
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"This part of the regular expression may cause exponential backtracking on strings " + prefixMsg +
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"containing many repetitions of '" + pump + "'."
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