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<title>[50849] External libraries: Improve attachment handling in PHPMailer</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/50849">50849</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/50849","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>peterwilsoncc</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2021-05-12 22:24:58 +0000 (Wed, 12 May 2021)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>External libraries: Improve attachment handling in PHPMailer
Props: audrasjb, ayeshrajans, desrosj, peterwilsoncc, xknown.
Partially merges <a href="https://core.trac.wordpress.org/changeset/50799">[50799]</a> to the 5.5 branch.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches55srcwpincludesPHPMailerPHPMailerphp">branches/5.5/src/wp-includes/PHPMailer/PHPMailer.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches55">branches/5.5/</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/5.5
</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/5.5 2021-05-12 22:24:16 UTC (rev 50848)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/5.5 2021-05-12 22:24:58 UTC (rev 50849)
</ins><a id="branches55"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/5.5</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/3.4:21757
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:43557,43622
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:48685-48686,48688-48689,48696,48701,48703,48705,48707,48717,48719,48721,48725-48726,48729-48731,48734,48736,48742,48745,48748-48751,48757-48758,48761,48767,48770,48772,48775,48777-48778,48783,48792,48796-48797,48800-48802,48808-48809,48814,48817,48820,48827,48832,48842,48850,48852-48853,48856,48859,48862,48864,48866,48868,48870,48872,48874,48876,48878,48880-48881,48884,48886,48888,48890,48892,48894-48895,48897,48899,48904,48908-48913,48918,48923-48924,48938,48946,48958,49121,49145-49147,49152,49162,49166,49168-49169,49175,49187,49201,49204,49227-49228,49244,49271,49306,49328,49335,49355,49359,49362,49369,49371,49380,49452,49548,49636,49779,49781-49784,49786,49836,49913,49933,49937-49940,49951,49983,49989-49990,50016-50017,50126,50176,50185,50192,50267-50268,50285,50298-50299,50379,50387,50413,50416,50432,50435-50436,50441-50444,50446,50473-50474,50476,50479,50485-50487,50545,50579
,50590,50592,50598,50670
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:48685-48686,48688-48689,48696,48701,48703,48705,48707,48717,48719,48721,48725-48726,48729-48731,48734,48736,48742,48745,48748-48751,48757-48758,48761,48767,48770,48772,48775,48777-48778,48783,48792,48796-48797,48800-48802,48808-48809,48814,48817,48820,48827,48832,48842,48850,48852-48853,48856,48859,48862,48864,48866,48868,48870,48872,48874,48876,48878,48880-48881,48884,48886,48888,48890,48892,48894-48895,48897,48899,48904,48908-48913,48918,48923-48924,48938,48946,48958,49121,49145-49147,49152,49162,49166,49168-49169,49175,49187,49201,49204,49227-49228,49244,49271,49306,49328,49335,49355,49359,49362,49369,49371,49380,49452,49548,49636,49779,49781-49784,49786,49836,49913,49933,49937-49940,49951,49983,49989-49990,50016-50017,50126,50176,50185,50192,50267-50268,50285,50298-50299,50379,50387,50413,50416,50432,50435-50436,50441-50444,50446,50473-50474,50476,50479,50485-50487,50545,50579
,50590,50592,50598,50670,50799
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches55srcwpincludesPHPMailerPHPMailerphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/5.5/src/wp-includes/PHPMailer/PHPMailer.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/5.5/src/wp-includes/PHPMailer/PHPMailer.php 2021-05-12 22:24:16 UTC (rev 50848)
+++ branches/5.5/src/wp-includes/PHPMailer/PHPMailer.php 2021-05-12 22:24:58 UTC (rev 50849)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1747,10 +1747,31 @@
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> protected static function isPermittedPath($path)
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return !preg_match('#^[a-z]+://#i', $path);
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ //Matches scheme definition from https://tools.ietf.org/html/rfc3986#section-3.1
+ return !preg_match('#^[a-z][a-z\d+.-]*://#i', $path);
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</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">+ * Check whether a file path is safe, accessible, and readable.
+ *
+ * @param string $path A relative or absolute path to a file
+ *
+ * @return bool
+ */
+ protected static function fileIsAccessible($path)
+ {
+ if (!static::isPermittedPath($path)) {
+ return false;
+ }
+ $readable = file_exists($path);
+ //If not a UNC path (expected to start with \\), check read permission, see #2069
+ if (strpos($path, '\\\\') !== 0) {
+ $readable = $readable && is_readable($path);
+ }
+ return $readable;
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Send mail using the PHP mail() function.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @see http://www.php.net/manual/en/book.mail.php
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2133,7 +2154,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> // There is no English translation file
</span><span class="cx" style="display: block; padding: 0 10px"> if ('en' !== $langcode) {
</span><span class="cx" style="display: block; padding: 0 10px"> // Make sure language file path is readable
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if (!static::isPermittedPath($lang_file) || !file_exists($lang_file)) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if (!static::fileIsAccessible($lang_file)) {
</ins><span class="cx" style="display: block; padding: 0 10px"> $foundlang = false;
</span><span class="cx" style="display: block; padding: 0 10px"> } else {
</span><span class="cx" style="display: block; padding: 0 10px"> // Overwrite language-specific strings.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2965,7 +2986,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $disposition = 'attachment'
</span><span class="cx" style="display: block; padding: 0 10px"> ) {
</span><span class="cx" style="display: block; padding: 0 10px"> try {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if (!static::isPermittedPath($path) || !@is_file($path) || !is_readable($path)) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if (!static::fileIsAccessible($path)) {
</ins><span class="cx" style="display: block; padding: 0 10px"> throw new Exception($this->lang('file_access') . $path, self::STOP_CONTINUE);
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3140,7 +3161,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> protected function encodeFile($path, $encoding = self::ENCODING_BASE64)
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><span class="cx" style="display: block; padding: 0 10px"> try {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if (!static::isPermittedPath($path) || !file_exists($path) || !is_readable($path)) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if (!static::fileIsAccessible($path)) {
</ins><span class="cx" style="display: block; padding: 0 10px"> throw new Exception($this->lang('file_open') . $path, self::STOP_CONTINUE);
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> $file_buffer = file_get_contents($path);
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -3526,7 +3547,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $disposition = 'inline'
</span><span class="cx" style="display: block; padding: 0 10px"> ) {
</span><span class="cx" style="display: block; padding: 0 10px"> try {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if (!static::isPermittedPath($path) || !@is_file($path) || !is_readable($path)) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ if (!static::fileIsAccessible($path)) {
</ins><span class="cx" style="display: block; padding: 0 10px"> throw new Exception($this->lang('file_access') . $path, self::STOP_CONTINUE);
</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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