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ECMAScript 6 introduced template literals[0][1] which are delimited with backticks. These need to be escaped in a similar fashion to the delimiters for other string literals. Additionally template literals can contain special syntax for string interpolation. There is no clear way to allow safe insertion of actions within JS template literals, as handling (JS) string interpolation inside of these literals is rather complex. As such we've chosen to simply disallow template actions within these template literals. A new error code is added for this parsing failure case, errJsTmplLit, but it is unexported as it is not backwards compatible with other minor release versions to introduce an API change in a minor release. We will export this code in the next major release. The previous behavior (with the cavet that backticks are now escaped properly) can be re-enabled with GODEBUG=jstmpllitinterp=1. This change subsumes CL471455. Thanks to Sohom Datta, Manipal Institute of Technology, for reporting this issue. Fixes CVE-2023-24538 Fixes #59234 [0] https://tc39.es/ecma262/multipage/ecmascript-language-expressions.html#sec-template-literals [1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1802457 Reviewed-by: Damien Neil <dneil@google.com> Run-TryBot: Damien Neil <dneil@google.com> Reviewed-by: Julie Qiu <julieqiu@google.com> Reviewed-by: Roland Shoemaker <bracewell@google.com> Change-Id: Ia221fefdb273bd0f066dffc2abcf2a616801d2f2 Reviewed-on: https://go-review.googlesource.com/c/go/+/482079 TryBot-Bypass: Michael Knyszek <mknyszek@google.com> Run-TryBot: Michael Knyszek <mknyszek@google.com> Reviewed-by: Matthew Dempsky <mdempsky@google.com> Auto-Submit: Michael Knyszek <mknyszek@google.com> |
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