Solved: Protected servers under syn attack!!

Sundeep Dsouza · ‎02-05-2011

The firewall dashboard has a window at the right lower portion of ASDM and it displays Top 10 protected servers under SYN attack. Refer to the attached picture.

In this scenario the server IP 82.214.154.223 seems to be getting SYN attacks from one of my internal network PC. This server 82.214.154.223 does not belong to us, a whois query tells me that the IP originates from Poland with no hostname address.

I should have been seeing attacks only for servers belonging to my network right? Like an attack from Outside public IP towards my Server public IP, or is it that this feature provides two way statistics where it also displays attack originating from my lan towards outside world. From what I see, I feel it displays two way attacks. Correct me if I am wrong.

Regards

Jennifer Halim · ‎02-06-2011

Yes, it is protecting both directions of the traffic passing through the ASA, inbound and outbound by default.

It looks like your internal host is attacking the 82.214.154.223 host, or it might be some software that is trying to reach 82.214.154.223, however, this host is not responding. Might be peer to peer file sharing or other similar sort of application.

There are different types and features of threat detection, and here is more information for your reference:

http://www.cisco.com/en/US/docs/security/asa/asa83/configuration/guide/protect_threat.html

Hope that helps.

View solution in original post

Jennifer Halim · ‎02-06-2011

Yes, it is protecting both directions of the traffic passing through the ASA, inbound and outbound by default.

It looks like your internal host is attacking the 82.214.154.223 host, or it might be some software that is trying to reach 82.214.154.223, however, this host is not responding. Might be peer to peer file sharing or other similar sort of application.

There are different types and features of threat detection, and here is more information for your reference:

http://www.cisco.com/en/US/docs/security/asa/asa83/configuration/guide/protect_threat.html

Hope that helps.

aamircisco · ‎06-03-2013

Hi,

below is the output of the # sh threat-detection rate command. can anyone explain me the vulnerabilities and risks by looking at the figures below. thanks

Average(eps) Current(eps) Trigger Total events

10-min ACL drop: 1 0 0 672

1-hour ACL drop: 1 0 0 4654

10-min SYN attck: 0 0 0 386

1-hour SYN attck: 0 0 0 3428

10-min Scanning: 2 1 55503 1248

1-hour Scanning: 2 2 18455 9177

10-min Bad pkts: 0 0 0 184

1-hour Bad pkts: 0 0 0 1089

10-min Firewall: 1 0 0 862

1-hour Firewall: 1 1 0 5749

10-min DoS attck: 0 0 0 6

1-hour DoS attck: 0 0 0 6

10-min Interface: 1 0 0 1034

1-hour Interface: 1 1 0 6616

regards,

AAMIR