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<title>[41450] branches/4.8: oEmbed: Add extra hardening around allowed HTML for improved sandboxing.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41450">41450</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41450","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>aaroncampbell</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-09-19 13:46:41 +0000 (Tue, 19 Sep 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>oEmbed: Add extra hardening around allowed HTML for improved sandboxing.
Merges <a href="https://core.trac.wordpress.org/changeset/41448">[41448]</a> to 4.8 branch.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches48srcwpincludesembedphp">branches/4.8/src/wp-includes/embed.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches48">branches/4.8/</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/4.8
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/4.8 2017-09-19 13:43:28 UTC (rev 41449)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/4.8 2017-09-19 13:46:41 UTC (rev 41450)
</ins><a id="branches48"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/4.8</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/3.1:18031
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.3:20543
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/3.4:21757
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:18512,40872-40873,40879,40881,40883,40885,40892-40893,40896-40897,40901,40926-40927,40939,40941,40961,40990-40991,40995,41000,41009,41020,41022,41028,41035,41037,41047,41050,41070,41072,41086,41088,41094,41112,41115-41116,41132,41134,41136,41139,41141,41250-41251,41260,41294,41335,41386,41393,41395,41397-41398
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:18512,40872-40873,40879,40881,40883,40885,40892-40893,40896-40897,40901,40926-40927,40939,40941,40961,40990-40991,40995,41000,41009,41020,41022,41028,41035,41037,41047,41050,41070,41072,41086,41088,41094,41112,41115-41116,41132,41134,41136,41139,41141,41250-41251,41260,41294,41335,41386,41393,41395,41397-41398,41448
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches48srcwpincludesembedphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/4.8/src/wp-includes/embed.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/4.8/src/wp-includes/embed.php 2017-09-19 13:43:28 UTC (rev 41449)
+++ branches/4.8/src/wp-includes/embed.php 2017-09-19 13:46:41 UTC (rev 41450)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -753,25 +753,31 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> $html = $content[1] . $content[2];
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( ! empty( $content[1] ) ) {
- // We have a blockquote to fall back on. Hide the iframe by default.
- $html = str_replace( '<iframe', '<iframe style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', $html );
- $html = str_replace( '<blockquote', '<blockquote class="wp-embedded-content"', $html );
- }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ preg_match( '/ src=([\'"])(.*?)\1/', $html, $results );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $html = str_replace( '<iframe', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $html );
-
- preg_match( '/ src=[\'"]([^\'"]*)[\'"]/', $html, $results );
-
</del><span class="cx" style="display: block; padding: 0 10px"> if ( ! empty( $results ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $secret = wp_generate_password( 10, false );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $url = esc_url( "{$results[1]}#?secret=$secret" );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $url = esc_url( "{$results[2]}#?secret=$secret" );
+ $q = $results[1];
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $html = str_replace( $results[0], " src=\"$url\" data-secret=\"$secret\"", $html );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $html = str_replace( $results[0], ' src=' . $q . $url . $q . ' data-secret=' . $q . $secret . $q, $html );
</ins><span class="cx" style="display: block; padding: 0 10px"> $html = str_replace( '<blockquote', "<blockquote data-secret=\"$secret\"", $html );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $allowed_html['blockquote']['data-secret'] = true;
+ $allowed_html['iframe']['data-secret'] = true;
+
+ $html = wp_kses( $html, $allowed_html );
+
+ if ( ! empty( $content[1] ) ) {
+ // We have a blockquote to fall back on. Hide the iframe by default.
+ $html = str_replace( '<iframe', '<iframe style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', $html );
+ $html = str_replace( '<blockquote', '<blockquote class="wp-embedded-content"', $html );
+ }
+
+ $html = str_ireplace( '<iframe', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $html );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> return $html;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span></span></pre>
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