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JS: Use clearsContent from variable-capture output #21398

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JS: Use clearsContent from variable-capture output #21398

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5 changes: 5 additions & 0 deletions javascript/ql/lib/semmle/javascript/dataflow/internal/DataFlowPrivate.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -1616,6 +1616,11 @@ predicate clearsContent(Node n, ContentSet c) {
VariableCaptureOutput::storeStep(getClosureNode(n), _, _) and
c = MkAnyCapturedContent()
or
exists(LocalVariableOrThis v |
VariableCaptureOutput::clearsContent(getClosureNode(n), v) and
c.asSingleton().asCapturedVariable() = v
)
or
// Block flow into the "window.location" property, as any assignment/mutation to this causes a page load and stops execution.
// The use of clearsContent here ensures we also block assignments like `window.location.href = ...`
exists(DataFlow::PropRef ref |
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