For this reason, Cisco recommends AsyncOS 13.5 for Email Security or newer to provide the latest protections for URL defense. There is no option to disable the expansion of shortened URLs. After you upgrade to this release, all shortened URLs are expanded. This configuration option was updated in AsyncOS 13.5 for Email Security. With the CLI command' websecurityadvancedconfig,' the shortener services could be seen and configured. Note: In the AsyncOS 11.1 for Email Security release, URL Filtering introduced support for shortened URLs. Allow you to identify users in your organization who most frequently clicked a URL in a message that has been rewritten for protection and links that have most commonly been clicked.The category of URLs (Adult Content or Illegal Activities, for example) can be used with content and message filters to enforce acceptable corporate use policies.Support enforcement of corporate acceptable use policies. For example, if a link in a message belongs to a marketing website, the message is more likely to be a marketing message. The appliance uses the reputation and category of links in messages and other spam-identification algorithms to help identify spam.For example, you can rewrite URLs with a neutral or unknown reputation to redirect them to the Cisco Web Security Proxy for click-time evaluation of their safety. You can also use content or message filters to take action based on the Web-Based Reputation Score (WBRS) of URLs in messages.This strengthened protection is applicable even if your organization already has a Cisco Web Security Appliance or similar protection from web-based threats because it blocks threats at the point of entry. In addition, URL Filtering is incorporated into Outbreak Filters.Increase the effectiveness of protection from untrusted URLs in messages and attachments.For more details, see the "Using Message Filters to Enforce Email Policies," "Content Filters," and "Protecting Against Untrusted or Undesirable URLs" chapters in the User Guide or online help.Ĭontrol and protection against untrusted or undesirable links are incorporated into the work queue for anti-spam, outbreak, content, and message filtering processes. Message and content filters use the URL Reputation and URL Category to check for URLs in messages and attachments. This release allowed the configuration of Cisco Secure Email to scan for URLs in message attachments and perform configured actions on such messages. URL Filtering was first introduced with AsyncOS 11.1 for Email Security. This document describes how to configure URL Filtering on Cisco Secure Email Gateway and Cloud Gateway and best practices for URL Filtering use.
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