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How to fix the error "SSH Protocol Version 1 Session Key Retrieval"

10/14/2021 11 People found this article helpful 101,745 Views

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    Description

    PCI scan of the SonicWall UTM appliance reports the following vulnerability: "SSH Protocol Version 1 Session Key Retrieval".

    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.


    SonicWall UTM appliances uses SSH1 along with SSH2 and as of now we cannot disable SSH1 alone. But this vulnerability can be remedied using one of the following resolutions.

    Resolution1: Disable SSH on the WAN interfaces.

    Step 1: Click Manage in the top navigation menu. Go to Network | Interfaces. Click Configure icon on the WAN interface.

    Image

    Step 2: Disable SSH management and click OK.

    Image

    Resolution 2:  Allow SSH management access only from specific trusted source IP Addresses.

    Step1: Click Manage in the top navigation menu. Go to Objects | Address Objects and click Add under address objects.


    Step2: Enter the name for the object and enter the IP address of the computer from where you are trying to take SSH session. Select the zone as WAN.


    Image


    Step3: Go to Rules | Access Rules and select WAN > WAN rule.  You can see the SSH management rule.

    Image


    Step4:  Edit the rule and select "My IP address" from the drop down list.

    Image

    Note: If you want to allow multiple IP addresses, you need to create address objects and group them together in a address group. Then select the address group in the source of access rule.
     

    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.


    SonicWall UTM appliances uses SSH1 along with SSH2 and as of now we cannot disable SSH1 alone. But this vulnerability can be remedied using one of the following resolutions.

    Resolution1: Disable SSH on the WAN iinterfaces.

    Step 1: Goto Network | Interface. Click Configure icon on the WAN interface.

    Image

    Step 2: Disable SSH management and click OK.

    Image

    Resolution 2:  Allow SSH management access only from specific trusted source IP Addresses.

    Step1: Go to Firewall | Address Object
     and click Add under address objects.

    Step2: Enter the name for the object and enter the IP address of the computer from where you are trying to take SSH session. Select the zone as WAN.


    Image


    Step3: Goto Firewall | Access Rule and select WAN > WAN rule.  You can see the SSH management rule.

    Image


    Step4:  Edit the rule and select "My IP address" from the drop down list.

    Image

    Note: If you want to allow multiple IP addresses, you need to create address objects and group them together in a address group. Then select the address group in the source of access rule.

    Related Articles

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    • Supported SonicWall and 3rd party SFP and SFP+ modules that can be used with SonicWall NSA series

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall NSA Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > SonicWall SuperMassive E10000 Series

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