Advisory Details

September 8th, 2020

Mitsubishi Electric MELSEC iQ-F Predictable TCP Sequence Number Remote Code Execution Vulnerability

CVE ID	CVE-2020-16226
CVSS SCORE	9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Mitsubishi Electric
AFFECTED PRODUCTS	MELSEC iQ-F
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Mitsubishi Electric MELSEC iQ-F. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of ACK packets. When generating ACK packets, the application uses a predictable sequence number. An attacker can leverage this vulnerability to execute arbitrary code in the context of the current process.
ADDITIONAL DETAILS	Mitsubishi Electric has issued an update to correct this vulnerability. More details can be found at: https://us-cert.cisa.gov/ics/advisories/icsa-20-245-01
DISCLOSURE TIMELINE	2020-04-21 - Vulnerability reported to vendor 2020-09-08 - Coordinated public release of advisory 2020-09-17 - Advisory Updated
CREDIT	Ta-Lun Yen of TXOne IoT/ICS Security Research Labs (Trend Micro)

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