Solved

land attack

Posted on 2006-06-22
3
803 Views
Last Modified: 2008-01-16
i see an impossible ip packet alert being triggered on the cisco ips sensors.  the traffic is from and to one of the domain controllers on udp port 138.  this may be indicative of land attack but it is happening on a couple of servers.  also, the servers are properly patched and nothing malacious was detected on the servers.  the other servers are not DCs.

does anyone know more about this?

thanks,
netgeek
0
Comment
Question by:net-geek
  • 2
3 Comments
 
LVL 38

Accepted Solution

by:
Rich Rumble earned 50 total points
ID: 16963164
There are false positives with most IDS and IPS systems, but this error has occured with Snort IDS sig's in the past
http://www.snort.org/archive-3-1767.html
http://support.microsoft.com/kb/188001

They could be spoofed, if possible, install wireshark (formerly ethereal) on the pc's in question and see if they are actaully sending that data, or span the port of these pc's to a sniffer to see if they are infact comming from that pc.
The LAND attack is a variation on the SYN attack. In the LAND attack, instead of sending
SYN packets with IP addresses that do not exist, the flood of SYN packets all have the same
spoof IP address—that of the targeted computer. The LAND attack can be prevented by filtering
out incoming packets for which source IP addresses appear to be from computers on the internal
network
-rich
0
 

Author Comment

by:net-geek
ID: 17003679
ok, thanks.
0
 
LVL 38

Expert Comment

by:Rich Rumble
ID: 17005173
Were you able to confirm that the traffic was definatly comming from the source that your IDS said it was? Just curious.
-rich
0

Featured Post

Now Available: Firebox Cloud for AWS and FireboxV

Firebox Cloud brings the protection of WatchGuard’s leading Firebox UTM appliances to public cloud environments. It enables organizations to extend their security perimeter to protect business-critical assets in Amazon Web Services (AWS).

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Most MSPs worth their salt are already offering cybersecurity to their customers. But cybersecurity as a service is wide encompassing and can mean many things.  So where are MSPs falling in this spectrum?
Do you know what to look for when considering cloud computing? Should you hire someone or try to do it yourself? I'll be covering these questions and looking at the best options for you and your business.
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question