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Control and protection against malicious or undesirable links is incorporated into the anti-spam, outbreak, content, and message filtering processes in the work queue. These controls:. Increase the effectiveness of protection from malicious URLs in messages and attachments. URL filtering is incorporated into Outbreak Filtering. This strengthened protection is useful 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.
The appliance uses the reputation and category of links in messages, in conjunction with other spam-identification algorithms, to help identify spam. For example, if a link in a message belongs to a marketing web site, the message is more likely to be a marketing message. Support enforcement of corporate acceptable use policies. The category of URLs for example, Adult Content or Illegal Activities can be used in conjunction with content and message filters to enforce corporate acceptable use policies. URLs in incoming and outgoing messages including attachments are evaluated. Any valid string for a URL is evaluated, including strings with the following:.
When evaluating URLs to determine whether a message is spam, if necessary for load management, the system prioritizes screening of incoming messages over outgoing messages. In addition to enabling URL filtering, you must enable other features depending on desired functionality.
Anti-spam scanning must be enabled globally and per applicable mail policy. See the anti-spam chapter. The Outbreak Filters feature must be enabled globally and per applicable mail policy. See the Outbreak Filters chapter. To take action based on URL reputation, or to enforce acceptable use policies using message and content filters:. The Outbreak Filters feature must be enabled globally. Before You Begin. Click Enable. Optional If you have created a list of URLs to exempt from URL filtering when evaluating messages for spam and malware, and from all content and message filtering, select that list.
This setting does not cause the message to Women want sex Cisco anti-spam or Outbreak Filters processing generally. Optional Enable Web Interaction Tracking. See Web Interaction Tracking. If you have met the applicable prerequisites, and Women want sex Cisco have already configured Outbreak Filters and Anti-Spam protection, then you do not need to make additional configurations to benefit from enhanced automatic detection of spam and malicious URLs.
Certificates are updated automatically see Service Updates. For additional information about required certificates, see the Release Notes available from the location specified in Certificates for URL Filtering Features. For more information about using a proxy server, see Configuring Server Settings for Downloading Upgrades and Updates. AsyncOS is deed to automatically deploy and update the certificates needed for communications with cloud services used for URL filtering features. However, if for any reason the system is unable to update these certificates, you will receive an alert that requires action from you.
Ensure that the appliance is configured to send you these alerts System type, Warning severity. For instructions, see Alerts. If you receive an alert about an invalid certificate, contact Cisco TAC, which can provide the required replacement certificate. For instructions to use the replacement certificate, see Manually Configuring a Certificate for Communication with Talos Intelligence Services.
The web interaction tracking feature provides information about the end users who clicked on rewritten URLs and the action allowed, blocked, or unknown associated with each user click. Once you enable this feature, you can use the Web Interaction Tracking report to view information such as top malicious URLs clicked, top users who clicked on malicious URLs, and so on.
Depending on your requirements, you can enable web interaction tracking on one of the global settings s:. The appliance connects to the Cisco Aggregator Server every 30 minutes non-configurableeither directly or through a web proxy, using the port specified for URL filtering services in Firewall Information Communication is over HTTPS with mutual certificate authentication.
If you specify a global allowed list when configuring the URL Filtering feature, then URLs on the allowed list are not evaluated for reputation or category, for anti-spam, Outbreak Filtering, or content and message filtering.
However, the messages that contain these URLs are evaluated as usual by anti-spam scanning and Outbreak Filters. There is no relationship between URL filtering allowed lists described in this section and the allowd list used for sender reputation filtering based on IP Reputation score. Consider importing a list of URLs instead of creating one in the web interface. Be sure all URLs that you want to deate globally as an allowed list are in a single list.
You can select only one global allowed list for URL filtering. Then click the more The first line must be the name of the URL list. This notification states that the site is malicious and access to it has been blocked. When an end user clicks on a URL rewritten using Outbreak Filtering, the notification is displayed for 10 seconds and then is redirected to the Cisco Web Security proxy for click-time evaluation. Check the Enable Block customization check box and enter the following details:.
Choose the language of the notification. You can choose any one of the languages supported by the web interface. Set up URL rewriting in one of the following ways:. You can take action based on the reputation or category of URL links in the message body or message attachment using message filters and content filters in incoming and outgoing mail policies. Because Outbreak Filters take many factors into consideration when evaluating messages for malware, and URL reputation alone may not trigger aggressive message handling, you may want to create filters based on URL reputation.
Take action on the message as a whole.
As always, you must specify a content filter in a mail policy in order to use it. You can perform actions on messages based on the reputation or category of URLs in the message body and message attachments. If you do not specify a category, the action you choose is applied to all messages.
However, you can specify a custom range instead. The specified endpoints are included in the range you specify. For example, if you create a custom range from -8 tothen -8 and are included in the range. The action that you pair with this condition is taken if any URL in the message matches the reputation score or any category specified in the condition. Content Filters. The action is applied only to URLs that meet the criteria specified in the action. Other URLs in the message are not modified. Redirect a URL so that if the message recipient clicks the link, the transaction is routed to a Cisco web security proxy in the cloud, which blocks access if the site is malicious.
Example: You might want to redirect all URLs in the Uncategorized category to the Cisco Cloud Web Security proxy service, as malicious sites used in phishing attacks often do not exist long enough to be classified. To redirect URLs to a different proxy, see the example in the following bullet. Message from your system administrator: A link to an illegal downlo web site has been removed from this message.
Include the original URL along with a warning:. Redirect to a custom proxy or web security service:. If you pair a condition rule and action that include differentthen no match occurs. Based on the evaluation by the Cisco Cloud Web Security proxy service:. If the site is malicious, the user sees a notice that the site is malicious and access to it has been blocked. If you only want to use the 'URL Reputation' condition with any appropriate action, do not follow steps of the procedure. If you only want to use the 'URL Reputation' action with any or no condition.Things Women Love Most About Sex!
Make sure that you enable URL filtering on your gateway. Make sure that you enable Outbreak Filters on your gateway. For more information, see Outbreak Filters. Make sure that you enable Anti-Spam engine on your gateway.
For more information, see Managing Spam and Graymail. Optional Create a URL list. Optional Select the list of allow listed URLs that you do not want the gateway to detect for threats. Make sure that you select the same ETF source s that you selected in the condition Step 7. In Step 16, if you choose the 'Check URLs within' option as 'Attachments', you can only strip the attachment from the message. A value of '1' is used to detect malicious URLs in the message attachments.
A value of '1' is used to detect malicious URLs in the message body and subject. In the following example, if a URL in the message attachment is detected as malicious by the ETF engine, the attachment is stripped. To display details in Message Tracking for URLs caught by outbreak filters and relevant content filters:. For more information about the data displayed, see Message Tracking Details. To manage administrative user access to these potentially sensitive details, see Controlling Access to Sensitive Information in Message Tracking. Logs do not include information about what happens when a user clicks a redirected link in a message.
You receive an info-level alert about an error fetching the enrollment client certificate.
This certificate is required to connect to the following cloud-based services: Talos Intelligence Services to obtain URL reputation and category and Cisco Aggregator Server to obtain web interaction tracking data. Try the following:. You receive a critical alert about an invalid Beaker connector certificate. This certificate is required to connect to Talos Intelligence Services in the cloud in order to obtain URL reputation and category. To obtain and manually install a certificate, see Manually Configuring a Certificate for Communication with Talos Intelligence Services.
You receive the following warning alert: Unable to retrieve web interaction tracking information from the Cisco Aggregator Server. Except for changes explicitly described in this document, make no other changes using the websecurityadvancedconfig command without guidance from TAC. Messages that contain URLs in a particular category are not found when searching by that category.
Malicious URLs and messages containing marketing links are not caught by the anti-spam or outbreak filters. The defined action in a content or message filter based on URL category is not applied. Use this procedure if the appliance is unable to automatically obtain a certificate for communication with Talos Intelligence Services.
In the command-line interface, enter the websecurityconfig command. Follow the prompts to set the client certificate for Talos Intelligence Services Authentication.
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User Guide for AsyncOS for Cisco Security Appliances - MD (Maintenance Deployment)