WooYun.org

文件：install.php
// If we've been passed a default language, use it
$install_lang = isset($_REQUEST['install_lang']) ? pun_trim($_REQUEST['install_lang']) : 'English';
// If such a language pack doesn't exist, or isn't up-to-date enough to translate this page, default to English
if (!file_exists(PUN_ROOT.'lang/'.$install_lang.'/install.php'))
$install_lang = 'English';
require PUN_ROOT.'lang/'.$install_lang.'/install.php';
if (file_exists(PUN_ROOT.'config.php'))
{
// Check to see whether FluxBB is already installed
include PUN_ROOT.'config.php';
// If we have the 1.3-legacy constant defined, define the proper 1.4 constant so we don't get an incorrect "need to install" message
if (defined('FORUM'))
define('PUN', FORUM);
// If PUN is defined, config.php is probably valid and thus the software is installed
if (defined('PUN'))
exit($lang_install['Already installed']);
很明显$install_lang存在本地文件包含漏洞，且安装完后该文件不会主动删除
函数pun_trim：
function pun_trim($str, $charlist = false)
{
return is_string($str) ? utf8_trim($str, $charlist) : '';
}
跟进utf8_trim：
function utf8_trim( $str, $charlist=false)
{
if($charlist === false)
return trim($str);
return utf8_ltrim(utf8_rtrim($str, $charlist), $charlist);
}
最终pun_trim($_REQUEST['install_lang'])变成：
trim($_REQUEST['install_lang'])
所以对于漏洞利用没啥影响