Vulnerability identifier: #VU22634

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-13555

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Q03UDVCPU
Hardware solutions / Firmware
Q04UDVCPU
Hardware solutions / Firmware
Q06UDVCPU
Hardware solutions / Firmware
Q13UDVCPU
Hardware solutions / Firmware
Q26UDVCPU
Hardware solutions / Firmware
Q04UDPVCPU
Hardware solutions / Firmware
Q06UDPVCPU
Hardware solutions / Firmware
Q13UDPVCPU
Hardware solutions / Firmware
Q26UDPVCPU
Hardware solutions / Firmware
Q04UDEHCPU
Hardware solutions / Firmware
Q06UDEHCPU
Hardware solutions / Firmware
Q10UDEHCPU
Hardware solutions / Firmware
Q13UDEHCPU
Hardware solutions / Firmware
Q20UDEHCPU
Hardware solutions / Firmware
Q26UDEHCPU
Hardware solutions / Firmware
Q50UDEHCPU
Hardware solutions / Firmware
Q100UDEHCPU
Hardware solutions / Firmware
MELSEC-Q Q03UDECPU
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L02CPU
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L06CPU
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU-BT
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L02CPU-P
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L06CPU-P
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU-P
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU-PBT
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L02CPU-CM
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L06CPU-CM
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU-CM
Hardware solutions / Routers & switches, VoIP, GSM, etc
MELSEC-L L26CPU-BT-CM
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Mitsubishi Electric

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper resource management. A remote attacker can trigger resource exhaustion and cause the FTP service to enter a denial-of-service condition dependent on the timing at which a remote attacker connects to the FTP server on the affected CPU modules.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Q03UDVCPU: 21081

Q04UDVCPU: 21081

Q06UDVCPU: 21081

Q13UDVCPU: 21081

Q26UDVCPU: 21081

Q04UDPVCPU: 21081

Q06UDPVCPU: 21081

Q13UDPVCPU: 21081

Q26UDPVCPU: 21081

MELSEC-Q Q03UDECPU: 21081

Q04UDEHCPU: 21081

Q06UDEHCPU: 21081

Q10UDEHCPU: 21081

Q13UDEHCPU: 21081

Q20UDEHCPU: 21081

Q26UDEHCPU: 21081

Q50UDEHCPU: 21081

Q100UDEHCPU: 21081

MELSEC-L L02CPU: 21101

MELSEC-L L06CPU: 21101

MELSEC-L L26CPU: 21101

MELSEC-L L26CPU-BT: 21101

MELSEC-L L02CPU-P: 21101

MELSEC-L L06CPU-P: 21101

MELSEC-L L26CPU-P: 21101

MELSEC-L L26CPU-PBT: 21101

MELSEC-L L02CPU-CM: 21101

MELSEC-L L06CPU-CM: 21101

MELSEC-L L26CPU-CM: 21101

MELSEC-L L26CPU-BT-CM: 21101

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External links
http://ics-cert.us-cert.gov/advisories/icsa-19-311-01

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.