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Merge pull request #11307 from creative-commoners/pulls/5.2/cve-2024-32981

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[CVE-2024-32981] Disallow `data:text/html` in data attributes
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Guy Sartorelli 2024-07-17 11:37:13 +12:00 committed by GitHub
commit ff6ab16871
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GPG Key ID: B5690EEEBB952194
2 changed files with 26 additions and 2 deletions
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2
src/Forms/HTMLEditor/HTMLEditorSanitiser.php
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@ -347,7 +347,7 @@ class HTMLEditorSanitiser
}
// Matches "javascript:" with any arbitrary linebreaks inbetween the characters.
$regex = '/^\s*' . implode('\s*', str_split('javascript:')) . '/i';
$regex = '#^\s*(' . implode('\s*', str_split('javascript:')) . '|' . implode('\s*', str_split('data:text/html;')) . ')#i';
// Strip out javascript execution in href or src attributes.
foreach (['src', 'href', 'data'] as $dangerAttribute) {
if ($el->hasAttribute($dangerAttribute)) {

26
tests/php/Forms/HTMLEditor/HTMLEditorSanitiserTest.php
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@ -120,7 +120,31 @@ class HTMLEditorSanitiserTest extends FunctionalTest
'object[data]',
'<object data=javascript:alert()>',
'<object></object>',
'Object with dangerous content in data attribute is completely removed'
'Object with dangerous javascript content in data attribute is completely removed'
],
[
'object[data]',
'<object data="javascript:alert()">',
'<object></object>',
'Object with dangerous javascript content in data attribute with quotes is completely removed'
],
[
'object[data]',
'<object data="data:text/html;base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5sb2NhdGlvbik8L3NjcmlwdD4=">',
'<object></object>',
'Object with dangerous html content in data attribute is completely removed'
],
[
'object[data]',
'<object data="' . implode("\n", str_split(' DATA:TEXT/HTML;')) . 'base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5sb2NhdGlvbik8L3NjcmlwdD4=">',
'<object></object>',
'Object with split upper-case dangerous html content in data attribute is completely removed'
],
[
'object[data]',
'<object data="data:text/xml;base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5sb2NhdGlvbik8L3NjcmlwdD4=">',
'<object data="data:text/xml;base64,PHNjcmlwdD5hbGVydChkb2N1bWVudC5sb2NhdGlvbik8L3NjcmlwdD4="></object>',
'Object with safe xml content in data attribute is retained'
],
[
'img[src]',