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Fixed Function constructor template injection. #922

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merged 1 commit into from
Jun 4, 2025

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xeioex
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@xeioex xeioex commented Jun 3, 2025

The Function constructor uses a (function(<args>) {<body>}) template to construct new functions. This approach was vulnerable to template injection where malicious code could close the function body early and ignore the trailing brackets using // comments.

The fix is to insert extra newlines into the template, which prevents // comments from commenting out the remaining template.

This fixes issue #921.

@xeioex xeioex requested a review from VadimZhestikov June 3, 2025 00:44
The Function constructor uses a `(function(<args>) {<body>})` template
to construct new functions. This approach was vulnerable to template
injection where malicious code could close the function body early.

This fixes issue nginx#921.
VadimZhestikov

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@VadimZhestikov VadimZhestikov self-requested a review June 4, 2025 04:08
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Looks good

@xeioex xeioex merged commit aa358e1 into nginx:master Jun 4, 2025
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@xeioex xeioex deleted the fix_func_ctor branch June 4, 2025 05:21
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