8.23 Web Filtering

Access to external websites should be managed to reduce exposure to malicious content.

Web filtering in information security refers to the process of controlling access to websites and other internet-based resources, in order to protect the organisation's network and users from malicious or inappropriate content.

The followings to be considered for web filtering:

• Blocking access to known malicious websites: This is done by using databases of known malicious websites, and preventing access to them.
• Blocking access to certain categories of websites: This is done by using pre-configured categories, such as gambling, social networking, or adult content, and preventing access to them.
• Blocking access to certain types of content: This is done by identifying and blocking certain types of files, such as executable files or scripts, that could potentially be malicious.
• URL filtering: This is done by controlling access to specific URLs or domain names, and preventing access to them.
• Data loss prevention: This is done by monitoring the outbound traffic and blocking the exfiltration of sensitive data.
• Application control: This is done by controlling the access to specific applications, such as instant messaging, or peer-to-peer file sharing.
Web filtering can be implemented using hardware or software solutions, and it can be applied to the entire organisation or to specific groups of users. Web filtering can help to protect the organisation's network and users from malware and other cyber threats and can also be used to enforce organisational policies and to comply with regulatory requirements. However, it's important to note that web filtering alone is not a comprehensive security solution and should be used in conjunction with other security measures such as antivirus, intrusion detection, and incident response.