2006-08-17 23:36:35 +00:00
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<?php
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2006-08-19 17:53:59 +00:00
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require_once 'common.php';
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2006-08-17 23:36:35 +00:00
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2006-11-24 06:26:02 +00:00
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echo '<?xml version="1.0" encoding="UTF-8" ?>';
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2006-08-17 23:36:35 +00:00
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?><!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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2006-11-24 06:26:02 +00:00
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<title>HTML Purifier Variable Width Attack Smoketest</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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2006-08-17 23:36:35 +00:00
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</head>
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<body>
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2006-11-24 06:26:02 +00:00
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<h1>HTML Purifier Variable Width Attack Smoketest</h1>
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2006-08-17 23:36:35 +00:00
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<p>For more information, see
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<a href="http://applesoup.googlepages.com/bypass_filter.txt">Cheng Peng Su's
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original advisory.</a> This particular exploit code appears only to work
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in Internet Explorer, if it works at all.</p>
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<h2>Test</h2>
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<?php
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$purifier = new HTMLPurifier();
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?>
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<table>
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<thead><tr><th>ASCII</th><th width="30%">Raw</th><th>Output</th><th>Render</th></tr></thead>
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<tbody>
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<?php
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for ($i = 0; $i < 256; $i++) {
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$c = chr($i);
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$html = '<img src="" alt="X' . $c . '"';
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$html .= '>A"'; // in our out the attribute? ;-)
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$html .= "onerror=alert('$i')>O";
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$pure_html = $purifier->purify($html);
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?>
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<tr>
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<td><?php echo $i; ?></td>
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2006-08-19 17:53:59 +00:00
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<td style="font-size:8pt;"><?php echo escapeHTML($html); ?></td>
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<td style="font-size:8pt;"><?php echo escapeHTML($pure_html); ?></td>
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2006-08-17 23:36:35 +00:00
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<td><?php echo $pure_html; ?></td>
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</tr>
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<?php } ?>
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</tbody>
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</table>
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<h2>Analysis</h2>
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2006-08-19 17:53:59 +00:00
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<p>By making sure that UTF-8 is well formed and non-SGML codepoints are
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removed, as well as escaping quotes outside of tags, this is a non-threat.</p>
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2006-08-17 23:36:35 +00:00
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</body>
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</html>
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