How to block Ultrasurf browser Plugin using App Control Signatures

08/23/2021 41 19189

DESCRIPTION:

How to block Ultrasurf browser Plugin using App Control Signatures

RESOLUTION:

Resolution for SonicOS 6.5

This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

Feature/Application:

Ultrasurf allows end users to circumvent gateway security devices like web filters and secure web gateways in order to surf the Internet without restrictions. Ultrasurf browser add-on enables the user to browse the Internet without restrictions.



This article describes how to block Ultrasurf browser add-on using App Control Advanced signatures.

To block Ultrasurf browser add-on,

•   Enable DPI-SSL Client Inspection
•   Enable the check box Intrusion Prevention and enable the following application signatures must be enabled:
  
  1. PROXY-ACCESS > Ultrasurf
  2. PROXY-ACCESS > HTTP Proxy
  3. PROXY-ACCESS > Encrypted Key Exchange -- TCP Random Encryption - SID 5

Procedure:

Enabling DPI-SSL Client Inspection

1.    Login to the SonicWall Management GUI

2.    Navigate to the Manage > Deep Packet Inspection > SSL Client deployment page

3.    Enable the check box Enable SSL Client Inspection

4.    Enable the check box Intrusion Prevention

5.    Click on Accept at the bottom to save the changes.

For information on Client DPI-SSL, refer the following KB articles
 

      UTM: How to Configure Server DPI-SSL (5.6 onwards) (SW8729

      Troubleshooting common problems when implementing DPI-SSL (SW13543)

      Client DPI-SSL Frequently Asked Questions (FAQ) (SW10764)

Enabling UltraSurf application signatures

1.    Navigate to Manage > Rules > Advanced Application control

2.    Check the box under Enable App Control and click on the Accept button at the top to enable App Control.

3.    Under App Control Advanced > View Style select PROXY-ACCESS under Category;

4.    From the drop-down under Application, select Ultrasurf

5.    Click on Configure

6.    In the new window, select Enable under the Block and Log fields.

7.    Click on OK to save

Enabling HTTP Proxy application signatures

1.    From the drop-down under Application, select HTTP Proxy

2.    Click on Configure

3.    In the new window, select Enable under the Block and Log fields.

4.    Click on OK to save

Enabling SID 5 Encrypted Key Exchange -- TCP Random Encryption

1.    In the Lookup Signature ID field enter 5 and click on the search icon

2.    In the new window, select Enable under the Block and Log fields.

3.    Click on OK to save

Enabling Application Control on zones

·         Navigate to Manage > Network > Zones

·         Click on the configure button under the zone where you want to enable App Control.

·         Check Enable App Control Service.

·         Click on OK to save.

Resolution for SonicOS 6.2 and Below

The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.

Feature/Application:

Ultrasurf allows end users to circumvent gateway security devices like web filters and secure web gateways in order to surf the Internet without restrictions. Ultrasurf browser add-on enables the user to browse the Internet without restrictions.



This article describes how to block Ultrasurf browser add-on using App Control Advanced signatures.

To block Ultrasurf browser add-on,

1. Enable DPI-SSL Client Inspection
2. Enable the check box Intrusion Prevention

and enable the following application signatures must be enabled:

1. PROXY-ACCESS > Ultrasurf
2. PROXY-ACCESS > HTTP Proxy
3. PROXY-ACCESS > Encrypted Key Exchange -- TCP Random Encryption - SID 5

Procedure:

Enabling DPI-SSL Client Inspection

1. Login to the SonicWall Management GUI
2. Navigate to the DPI-SSL > Client SSL page
3. Enable the check box Enable SSL Client Inspection
4. Enable the check box Intrusion Prevention
5. Click on Accept at the top to save the changes

For information on Client DPI-SSL, refer the following KB articles
 

• UTM: How to Configure Server DPI-SSL (5.6 onwards) (SW8729
• Troubleshooting common problems when implementing DPI-SSL (SW13543)
• Client DPI-SSL Frequently Asked Questions (FAQ) (SW10764)

Enabling UltraSurf application signatures

1. Navigate to the Firewall > App Control Advanced page. In Gen5 TZ devices this page is under Security Services > App Control
2. Check the box under Enable App Control and click on the Accept button at the top to enable App Control.
3. Under App Control Advanced > View Style select PROXY-ACCESS under Category;
4. From the drop-down under Application, select Ultrasurf
5. Click on Configure
6. In the new window, select Enable under the Block and Log fields.
7. Click on OK to save

Enabling HTTP Proxy application signatures

1. From the drop-down under Application, select HTTP Proxy
2. Click on Configure
3. In the new window, select Enable under the Block and Log fields.
4. Click on OK to save

Enabling SID 5 Encrypted Key Exchange -- TCP Random Encryption

1. In the Lookup Signature ID field enter 5 and click on the search icon
2. In the new window, select Enable under the Block and Log fields.
3. Click on OK to save

Enabling Application Control on zones

• Navigate to Network > Zones
• Click on the configure button under the zone where you want to enable App Control.
• Check Enable App Control Service.
• Click on OK to save.