topic Re: Forwarding IPS events via Syslog in Network Security

Forwarding IPS events via Syslog

Nethariel — Tue, 12 Mar 2019 14:02:50 GMT

Hello,

We are using the IPS module on the Cisco ASA 5525-X Firewalls and we’re running version 6.2.0.6.

We would like to forward detailed logs to a Syslog server.

We followed these procedures:

https://www.cisco.com/c/en/us/support/docs/security/firesight-management-center/118464-configure-firesight-00.html

https://www.cisco.com/c/en/us/support/docs/security/asa-firepower-services/200328-Configure-Logging-in-Firepower-Module-fo.html

We are indeed receiving logs in our Syslog server. However, we are only receiving Block and Allow events. We are not receiving the detailed IPS events (i.e the reason behind a block). Here is an example:

Oct 21 13:00:00 somename SFIMS: Protocol: TCP, SrcIP: x.x.x.x, OriginalClientIP: ::, DstIP: y.y.y.y, SrcPort: 28971,
DstPort: 443, TCPFlags: 0x0, IngressInterface: internet, EgressInterface: dmz, DE: Primary Detection Engine
(9c902a8c), Policy: YY-Firewalls, ConnectType: End, AccessControlRuleName: XX-rule,
AccessControlRuleAction: Block, AccessControlRuleReason: Intrusion Block, Prefilter Policy: Unknown, UserName: No Authentication Required,
Client: SSL client, ApplicationProtocol: HTTPS, IPSCount: 1, InitiatorPackets: 6, ResponderPackets: 5, InitiatorBytes: 661, ResponderBytes:
5511, NAPPolicy: Balanced Security and Connectivity, DNSResponseType: No Error, Sinkhole: Unknown, URLCategory: Unknown, URLReputation: Risk
unknown

As you can see, the log line indicates a block but we don't see the reason.

In the FireSight Management console, we can see the reason behind a block, but we would like to see it in our Syslog server.

1- Can the FirePower module forward IPS events to a Syslog server? or only Connection Events?

2- If yes, what else should we do?

Thank you.

Re: Forwarding IPS events via Syslog

Marvin Rhoads — Mon, 22 Oct 2018 12:11:18 GMT

As you observed, IPS events via syslog only show a subset of the entire data set.

To get all the metadata you need to use an application like Splunk that connects as an eStreamer client to feed the event data.

Re: Forwarding IPS events via Syslog

Nethariel — Mon, 22 Oct 2018 12:55:15 GMT

Thank you for your quick reply Marvin.

The thing that confuses me is that AlienVault has a plugin to parse all kind of FirePower events. So you would expect that there should be a way to get these events to AlienVault.

Do you know if it is possible to do that without using additional applications?

Re: Forwarding IPS events via Syslog

Marvin Rhoads — Mon, 22 Oct 2018 13:55:02 GMT

Not as far as I know.

Cisco encourages customers to press their SIEM vendor to support eStreamer as it is considered architecturally capable to handle to potential volume of event coming from an FMC in a reliable and secure manner

Re: Forwarding IPS events via Syslog

Nethariel — Wed, 24 Oct 2018 07:58:47 GMT

Thanks again for your reply.

Do you know if using SNMP could work?

In this image, taken from the official guide, it says that Syslog sends Connection Events only, while SNMP doesn't say that. Could that be the reason/solution?