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Moxa’s Response Regarding the OpenSSL X.509 Email Address 4-byte Buffer Overflow Vulnerability (CVE-2022-3602)

Published: November 4, 2022

This Alert Is From MOXA

As Industrial IoT (IIoT) adoption continues to proliferate, cybersecurity has become one of the top priorities. The Moxa Product Security Incident Response Team (PSIRT) takes a proactive approach to protect products from cybersecurity vulnerabilities. Moxa PSIRT investigates all reports of vulnerabilities that could potentially affect Moxa products. Moxa created a vulnerability management policy to provide guidance and information to our customers in the event of a reported vulnerability. The management policy ensures that Moxa’s customers have steady, unambiguous resources to help them understand how Moxa resolves or mitigates reported vulnerabilities. For any queries, please email [email protected].

A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. This occurs after the certificate chain signature verification and requires either a CA to have signed the malicious certificate or for the application to continue certificate verification despite failing to construct a path to a trusted issuer. An attacker can craft a malicious email address to overflow four attacker-controlled bytes on the stack. This buffer overflow could result in a crash (causing a denial of service) or potentially remote code execution.

Moxa has completed our review and determined that none of our products are impacted by this vulnerability.

 

This alert has come from: https://www.moxa.com/en/support/product-support/security-advisory/moxa-response-regarding-the-openssl-x-509-email-address-4-byte-buffer-overflow-vulnerability-cve-2022-3602