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From ce7bd33345416e6d8cac901792060591cafc2797 Mon Sep 17 00:00:00 2001
From: Roland Shoemaker <bracewell@google.com>
Date: Tue, 11 Apr 2023 16:27:43 +0100
Subject: [PATCH] [release-branch.go1.19] html/template: handle all JS
whitespace characters
Rather than just a small set. Character class as defined by \s [0].
Thanks to Juho Nurminen of Mattermost for reporting this.
For #59721
Fixes #59813
Fixes CVE-2023-24540
[0] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes
Change-Id: I56d4fa1ef08125b417106ee7dbfb5b0923b901ba
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1821459
Reviewed-by: Julie Qiu <julieqiu@google.com>
Run-TryBot: Roland Shoemaker <bracewell@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/1851497
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Roland Shoemaker <bracewell@google.com>
Reviewed-on: https://go-review.googlesource.com/c/go/+/491355
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Bypass: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Upstream-Status: Backport [https://github.com/golang/go/commit/ce7bd33345416e6d8cac901792060591cafc2797]
CVE: CVE-2023-24540
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
src/html/template/js.go | 8 +++++++-
src/html/template/js_test.go | 11 +++++++----
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/src/html/template/js.go b/src/html/template/js.go
index fe7054efe5cd8..4e05c1455723f 100644
--- a/src/html/template/js.go
+++ b/src/html/template/js.go
@@ -13,6 +13,11 @@ import (
"unicode/utf8"
)
+// jsWhitespace contains all of the JS whitespace characters, as defined
+// by the \s character class.
+// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Character_classes.
+const jsWhitespace = "\f\n\r\t\v\u0020\u00a0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000\ufeff"
+
// nextJSCtx returns the context that determines whether a slash after the
// given run of tokens starts a regular expression instead of a division
// operator: / or /=.
@@ -26,7 +31,8 @@ import (
// JavaScript 2.0 lexical grammar and requires one token of lookbehind:
// https://www.mozilla.org/js/language/js20-2000-07/rationale/syntax.html
func nextJSCtx(s []byte, preceding jsCtx) jsCtx {
- s = bytes.TrimRight(s, "\t\n\f\r \u2028\u2029")
+ // Trim all JS whitespace characters
+ s = bytes.TrimRight(s, jsWhitespace)
if len(s) == 0 {
return preceding
}
diff --git a/src/html/template/js_test.go b/src/html/template/js_test.go
index e07c695f7a77d..e52180cc113b5 100644
--- a/src/html/template/js_test.go
+++ b/src/html/template/js_test.go
@@ -81,14 +81,17 @@ func TestNextJsCtx(t *testing.T) {
{jsCtxDivOp, "0"},
// Dots that are part of a number are div preceders.
{jsCtxDivOp, "0."},
+ // Some JS interpreters treat NBSP as a normal space, so
+ // we must too in order to properly escape things.
+ {jsCtxRegexp, "=\u00A0"},
}
for _, test := range tests {
- if nextJSCtx([]byte(test.s), jsCtxRegexp) != test.jsCtx {
- t.Errorf("want %s got %q", test.jsCtx, test.s)
+ if ctx := nextJSCtx([]byte(test.s), jsCtxRegexp); ctx != test.jsCtx {
+ t.Errorf("%q: want %s got %s", test.s, test.jsCtx, ctx)
}
- if nextJSCtx([]byte(test.s), jsCtxDivOp) != test.jsCtx {
- t.Errorf("want %s got %q", test.jsCtx, test.s)
+ if ctx := nextJSCtx([]byte(test.s), jsCtxDivOp); ctx != test.jsCtx {
+ t.Errorf("%q: want %s got %s", test.s, test.jsCtx, ctx)
}
}
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