Denial of service in Mitsubishi Electric MELSEC iQ-R series

1) Resource exhaustion

EUVDB-ID: #VU28933

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13238

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can send specially crafted packets, trigger resource exhaustion and perform a denial of service (DoS) attack.

This vulnerability affects the following MELSEC iQ-R series modules: 

• R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 39 or earlier
• R00/01/02CPU: Firmware Versions 7 or earlier
• R08/16/32/120SFCPU: Firmware Versions 20 or earlier
• R08/16/32/120PCPU: All versions
• R08/16/32/120PSFCPU: All versions
• RJ71EN71: All versions

Mitigation

Install updates from vendor's website.

Vulnerable software versions

MELSEC iQ-R series: All versions

External links

http://ics-cert.us-cert.gov/advisories/icsa-20-161-02

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 device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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