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Office of the AVP & CTO


Vulnerability Management

Vulnerabilities are software bugs that threaten information assurance (i.e., confidentiality, integrity, and availability). In other words, a vulnerability is a software bug that bad guys like to exploit in order to disrupt service, or gain access to systems and information. They’re bad news, and because they like them so much, the bad guys are always looking for new vulnerabilities to exploit. As such, a server that is considered secure today might be at risk tomorrow.

Managing vulnerabilities is a critical part of regular server and service maintenance. Installing vendor patches and bug fixes in a timely manner, and implementing secure configurations are key steps towards preventing the bad guys from owning your server. The IT Security team helps you to ensure that your server is configured as securely as possible by letting you know if we find something that needs attention. We use the Vulnerability Management Standard Operating Procedure to alert you to missed patches, or if your TLS configuration needs to be updated.


The Vulnerability Management Standard Operating Procedure is generally applicable to any system on the McMaster University network, or any system managed by or on behalf of the University. In short, any server that handles McMaster information. More specifically, this procedure is intended to mitigate vulnerabilities on high risk systems, such as:
  • Systems to which anyone on the internet can connect
  • Systems that collect credentials or leverage McMaster centralized authentication and authorization
  • Systems that handle credit card transactions
  • Systems that handle personally identifiable information (PII), personal health information (PHI), or any information that can be classified as confidential or restricted.


vulnerability management workflow diagram

Identify Vulnerabilities

The IT Security team uses a number of tools and resources to help identify vulnerabilities on high risk systems on the McMaster network. Some of these tools include weekly vulnerability scans, or CCIRC notifications.

Notify Server Owner or Delegate

When a vulnerability has been identified on a high risk system, the IT Security team will send a notification to the system owner, and also to the technical resource to whom system maintenance responsibilities have been delegated. We will include important details about the vulnerability, such as the impact of an exploit. We will also provide our recommendations, or the recommendations of trusted experts, to mitigate the risk of exploit.


After the owner or delegate has treated the risk, by either changing the configuration or installing an update, the IT Security team will perform follow up testing to ensure that the treatment was successful. Other treatment options include reducing the exposure by preventing public access to the server, or decommissioning the server if it is no longer in use.


In the event that the server owner or delegate fails to respond to the notification, or to treat the risk, in a timely manner, the matter may be escalated to the risk owner. The risk owner is the executive responsible for the department to which the server owner belongs.