OpenSMTPD security advisory

Number: AV20-043
Date: 25 February 2020

On 24 Febuary 2020 the OpenBSD Project released a security bulletin to address a remote code execution (RCE) vulnerability VulnerabilityA flaw or weakness in the design or implementation of an information system or its environment that could be exploited to adversely affect an organization's assets or operations. affecting versions 6.6.3p1 and below of its OpenSMTPD e-mail server software.  By sending a specially-crafted email to an affected system, a remote actor can execute arbitrary shell commands as Root.

The portable version of OpenSMTPD is also vulnerable to exploitation. This version runs on the following operating systems and has been incorporated into many of them:
• FreeBSD;
• NetBSD;
• DragonFlyBSD;
• Mac OS X; and
• Various other Linux distributions.

The Cyber Centre encourages users and administrators to review the vendor announcement below and obtain an updated version of OpenSMTPD: https://www.mail-archive.com/misc@opensmtpd.org/msg04888.html

Note to Readers

The Canadian Centre for Cyber Security Cyber securityThe protection of digital information, as well as the integrity of the infrastructure housing and transmitting digital information. More specifically, cyber security includes the body of technologies, processes, practices and response and mitigation measures designed to protect networks, computers, programs and data from attack, damage or unauthorized access so as to ensure confidentiality, integrity and availability. (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure Critical infrastructureProcesses, systems, facilities, technologies, networks, assets, and services essential to the health, safety, security, or economic well-being of Canadians and the effective functioning of government. Critical infrastructure can be stand-alone or interconnected and interdependent within and across provinces, territories, and national borders. Disruptions of critical infrastructure could result in catastrophic loss of life, adverse economic effects, and significant harm to public confidence. , Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.