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:
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113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
) W6 g  ^3 W# P( z/ ^9 ^114: {
115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
116:   header('Cache-Control: no-cache, must-revalidate');
$ i* |" m* C5 Y117:   header('Pragma: no-cache');
118:   header('Content-Disposition: attachment; filename="database.inc.php"');
119:   header('Content-Transfer-Encoding: binary');
120:   header('Content-Length: '.filesize($filename));
- T7 E) H8 O% K121:   echo file_get_contents($filename);
# C: J3 ]# e# O7 e122:   unlink($filename);
/ E6 J- M4 g7 h2 a123:   exit();
: S+ n! n3 X0 y) k124: }
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Tested on: Microsoft Windows 7 Ultimate SP1 (EN)
" v+ ~6 p- V) W; _           Apache 2.4.2 (Win32)
$ N# {9 q; W: Q& Z, U/ M& c           PHP 5.4.4
           MySQL 5.5.25a
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9 B1 ^0 o8 C* c$ Z! Y% I3 MVulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience

, K) h  a7 Z" E+ RAdvisory ID: ZSL-2013-5127
: G/ u" {6 C# a  V0 R. T+ OAdvisory 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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3 l5 M% }+ i2 f2 ^& vhttp://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt