Final Answer:
Upgrading the organization's firewall to block a new type of attack would occur in the Mitigation incident response phase.
Step-by-step explanation:
The incident response process involves several key phases, and when addressing a new type of attack, the phase in focus is Mitigation. In this phase, the organization takes proactive measures to limit the impact of the security incident. Upgrading the firewall to block a new type of attack is a strategic mitigation step aimed at preventing the attack from exploiting vulnerabilities.
This involves enhancing the organization's defense mechanisms to effectively thwart the specific threat identified. Mitigation actions not only include technological solutions but also may involve refining security policies, updating protocols, and enhancing employee training to reduce the risk of similar incidents in the future.
Implementing these measures promptly is crucial to minimizing the potential damage and ensuring the organization's cybersecurity resilience in the face of evolving threats.