Denial of service in Mitsubishi Electric GOT and Tension Controllers



Published: 2021-05-12
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-20589
CWE-ID CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
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GOT2000 GT27 model
Server applications / SCADA systems

GOT2000 GT25 model
Server applications / SCADA systems

GOT2000 GT23 model
Server applications / SCADA systems

GOT2000 GT21 model
Server applications / SCADA systems

GOT SIMPLE GS21 model
Server applications / SCADA systems

GT SoftGOT2000 Version1
Server applications / SCADA systems

LE7-40GU-L
Hardware solutions / Firmware

Vendor Mitsubishi Electric

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU53140

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20589

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the MODBUS/TCP server communication function. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

GOT2000 GT27 model: 01.19.000 - 01.38.000

GOT2000 GT25 model: 01.19.000 - 01.38.000

GOT2000 GT23 model: 01.19.000 - 01.38.000

GOT2000 GT21 model: 01.21.000 - 01.39.000

GOT SIMPLE GS21 model: 01.21.000 - 01.39.000

GT SoftGOT2000 Version1: 1.170C - 1.250L

LE7-40GU-L: 1.00

External links

http://ics-cert.us-cert.gov/advisories/icsa-21-131-02
http://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-002_en.pdf


Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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