mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-11-09 15:28:40 +00:00
62 lines
1.7 KiB
PHP
62 lines
1.7 KiB
PHP
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<?php
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header('Content-type: text/html; charset=UTF-8');
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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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<title>HTMLPurifier Variable Width Attack Smoketest</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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</head>
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<body>
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<h1>HTMLPurifier Variable Width Attack Smoketest</h1>
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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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set_include_path('../library' . PATH_SEPARATOR . get_include_path());
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require_once 'HTMLPurifier.php';
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$purifier = new HTMLPurifier();
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function escape($string) {
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$string = htmlspecialchars($string, ENT_COMPAT, 'UTF-8');
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$string = iconv('UTF-8', 'UTF-8//IGNORE', $string);
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return $string;
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}
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?>
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<table>
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<thead><tr><th>ASCII</th><th width="30%">Raw</th><th>Output</th><th>Render</th></tr></thead>
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<tbody>
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<?php
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for ($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 $i; ?></td>
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<td style="font-size:8pt;"><?php echo escape($html); ?></td>
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<td style="font-size:8pt;"><?php echo escape($pure_html); ?></td>
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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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<p>This test currently passes the XSS aspect but fails the validation aspect
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due to generalized encoding issues. An augmented UTF-8 smoketest is
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pending, until then, consider this a pass.</p>
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</body>
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</html>
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