Avast security advisory

Number: AV19-238
Date: 21 October 2019

On 21 October 2019 Avast published a blog post discussing a recent compromise CompromiseThe intentional or unintentional disclosure of information, which adversely impacts its confidentiality, integrity, or availability. of their internal networks. It is believed that CCleaner was the likely target in an attempted supply chain attack. Avast reported that there were no malicious alterations observed in prior releases of CCleaner.

On 15 October 2019 CCleaner version v5.63.7540 was released. This version contained a re-signed certificate for the product. Certificates for previous versions were then revoked.

The Cyber Centre encourages users and administrators to always stay up to date with the latest versions of software when available.

Avast Blog:

https://blog.avast.com/ccleaner-fights-off-cyberespionage-attempt-abiss

CCleaner v5.63.7540 announcement:

https://forum.piriform.com/topic/55747-ccleaner-v5637540/

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.