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casidcasid
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* Fix xss vulnerability in javascript template strings * Escape dollar signs to prevent undesired interpolation
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‎jte-runtime/src/main/java/gg/jte/html/escape/Escape.java

+4
Original file line numberDiff line numberDiff line change
@@ -49,6 +49,8 @@ public static void javaScriptBlock(String value, TemplateOutput output) {
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switch (c) {
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case '\'' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\'", output);
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case '"' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\\"", output);
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case '`' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\`", output);
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case '$' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\$", output);
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case '/' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\/", output);
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case '-' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\-", output);
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case '\\' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\\\", output);
@@ -73,6 +75,8 @@ public static void javaScriptAttribute(String value, TemplateOutput output) {
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switch (c) {
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case '\'' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\x27", output);
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case '"' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\x22", output);
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case '`' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\x60", output);
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case '$' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\x24", output);
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case '\\' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\\\", output);
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case '\n' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\n", output);
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case '\t' -> lastIndex = flushAndEscape(value, lastIndex, i, "\\t", output);

‎jte/src/test/java/gg/jte/TemplateEngine_HtmlOutputEscapingTest.java

+82
Original file line numberDiff line numberDiff line change
@@ -1313,6 +1313,88 @@ void invalidAttribute_semicolon() {
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assertThat(throwable).isInstanceOf(TemplateException.class).hasMessage("Failed to compile template.jte, error at line 1: Invalid HTML attribute name ;!");
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}
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@Test
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void templateStringInJavaScriptBlock_backtick() {
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codeResolver.givenCode("template.jte", """
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@param String someMessage
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>XSS Test</title>
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<script>window.someVariable = `${someMessage}`;</script>
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</head>
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<body>
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<h1>XSS Test</h1>
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</body>
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</html>
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""");
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templateEngine.render("template.jte", "` + alert(`xss`) + `", output);
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assertThat(output.toString()).isEqualTo("""
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>XSS Test</title>
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<script>window.someVariable = `\\` + alert(\\`xss\\`) + \\``;</script>
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</head>
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<body>
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<h1>XSS Test</h1>
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</body>
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</html>
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""");
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}
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@Test
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void templateStringInJavaScriptBlock_dollar() {
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codeResolver.givenCode("template.jte", """
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@param String someMessage
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>XSS Test</title>
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<script>window.someVariable = `${someMessage}`;</script>
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</head>
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<body>
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<h1>XSS Test</h1>
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</body>
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</html>
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""");
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templateEngine.render("template.jte", "${secret}", output);
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assertThat(output.toString()).isEqualTo("""
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>XSS Test</title>
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<script>window.someVariable = `\\${secret}`;</script>
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</head>
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<body>
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<h1>XSS Test</h1>
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</body>
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</html>
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""");
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}
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@Test
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void templateStringInJavaScriptAttribute_backtick() {
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codeResolver.givenCode("template.jte", "@param String p\n<span onClick=\"console.log(`${p}`)\">foo</span>");
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templateEngine.render("template.jte", "` + alert(`xss`) + `", output);
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assertThat(output.toString()).isEqualTo("<span onClick=\"console.log(`\\x60 + alert(\\x60xss\\x60) + \\x60`)\">foo</span>");
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}
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@Test
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void templateStringInJavaScriptAttribute_dollar() {
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codeResolver.givenCode("template.jte", "@param String p\n<span onClick=\"console.log(`${p}`)\">foo</span>");
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templateEngine.render("template.jte", "${secret}", output);
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assertThat(output.toString()).isEqualTo("<span onClick=\"console.log(`\\x24{secret}`)\">foo</span>");
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}
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@Test
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void localization_notFound_noParams() {
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codeResolver.givenCode("template.jte", """

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