Content Filtering Service (CFS) users are reporting an issue with lost licenses, which is resulting in the application of the default CFS policy to all users. This results in little to no internet access to users behind the firewall.
The Content Filter Status will show as Upgrade Required.
We are currently investigating this issue which may be related to SHA-1 algorithms being used on older versions of SonicOS (6.2.5.x below and 220.127.116.11 below). SonicWall recently applied an update to our license server back end. In this change we updated the SSL on these servers to utilize the latest security ciphers. Older version of our firmware does not support these ciphers and needs to be upgraded to connect to these servers.
As of January 1st, 2017, Certificate Authorities have unanimously stopped using SHA-1 certificates. This will result in browsers rejecting SHA-1 certificates. Any code which is signed after January 1st, 2016, is no longer trusted by Microsoft. Firmware versions prior to 18.104.22.168 do not support SHA-2 cryptographic hashing. This means that any SonicWall UTM appliances running this older firmware will experience issues with connecting to any sites which no longer use SHA-1.
Every 3rd generation SonicWall firewall is affected and vulnerable.
Every 4th generation SonicWall firewall is affected and vulnerable.
Every 5th generation SonicWall firewall running firmware newer than 5.6.x, but older than 5.8.4.x will not be able to manage licensing from the firewall.
Every 5th generation SonicWall firewall running firmware equal to 22.214.171.124 or newer will not be affected.
6th generation NSA 2600 on firmware older than 126.96.36.199 are affected and vulnerable.
All other 6th generation devices on firmware versions older than 188.8.131.52 are affected and vulnerable.
Gen 6 devices running 184.108.40.206 are not affected.
If you are using an older 5th generation SonicWall firewall, and that firewall is running 5.8.x firmware, it is recommended that you upgrade your firmware or upgrade to a 6th generation appliance. The driving factor behind this recommendation is that the 5.8.x firmware is known to contain vulnerabilities and limitations with regards to SHA-1 certificates. The main concern is that if enough computing resources are employed, attackers could conceivably generate fake certificates and install them to various endpoints on the Internet.
Appliance Upgrades At this point, all customers are strongly advised to upgrade all older firewalls to a comparable 6th generation SonicWall UTM appliance under the Customer Advantage Program (Secure Upgrade Plus offer). If you require any assistance with upgrading your appliance to 6th generation hardware, please contact your preferred SonicWall reseller.
Firmware Upgrades If you are unable to upgrade to a 6th generation appliance at this time, it is recommended that all customers upgrade all internal and external Certificate Authorities to SHA-2, and that all 5th generation appliances are running 220.127.116.11 or newer and all 6th generation appliances are running 18.104.22.168.
Preferably, all 5th generation appliances should be running 22.214.171.124, as this is our latest general release to date for 5th gen hardware.