Defense Center blocks Openssh

Hello world

I'm trying to ssh from my PC box.

The flow of traffic through the Internal interface sensor in - inside out.

When I check on DC I see ssh connection as Intrusion event

Impact 2

Message ssh_event_respoverflow(128:))

When I go to events by priority and rank, it shows

Political intrusion - C1

-Intrusion Prevention default access control policy

Internal IP - access control rule

Need to know how I can fix this problem?

Concerning

Mahesh

Hello Manu,

What version of Sourcefire Defense Center do you use?

It seems that your SSH preprocessor (GID 128) hit when it detects the SSH connection. You can view or change the behavior of the SSH preprocessor.

In version 5.4, you can manage thought the following menu:

 Policies -> Access Control -> Network Analysis Policy

Then, to change your 'network policy analysis' (remember to edit the right thing), then click on 'Settings' in the navigation panel on the left and select "SSH Configuration.

In version 5.2, you can manage it through the following menu:

 Policies -> Intrusion -> Intrusion Policy

Then, to change your strategy of intrusion and click "Advanced settings" in the navigation panel on the left. Now, in the right panel, change "SSH configuration.

You should read the online help to understand each options for the preprocessor "SSH" and finally understand why the drop occurred on your SSH connection.

Or, for testing, you can try to disable the rules by using the following in your intrusion policy filter:

 GID:"128"

Best regards

Tags: Cisco Security

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