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So, for almost every organization in the world, there are three questions that come to mind. I'll reference INR here.
Which of my public facing servers is vulnerable? The first step is to use your database you DO have a database matching services, servers, and operating systems, right?
Take them offline and patch them. Those are the knowns. Now, what about the unknowns? You cannot use the presence of malformed heartbeat requests to confirm or deny vulnerability — that just tells you somebody is attacking, which is perhaps a common event these last few days!
It is the heartbeat response that identifies whether a server is vulnerable. So what you need is to send each of your servers an exploit request and then filter on just heartbeat responses from vulnerable servers.
First, download the exploit code off the Internet, set it up on a workstation running outside your firewall on a known IP address X. Have it run the exploit against every IP address in your domain.
You just need to send them your IP addresses to attack. That will isolate the exploit attempts and responses. This filtering will result in a small amount of data over the length of time it takes for your exploit workstation to work through your IP address space.
Heartbeat requests both valid requests and exploit requests are typically less than 64 bytes long. Valid heartbeat responses should also be less than 64 bytes.
So the ssl. That means every packet that matches the above display filter is probably from a server that is vulnerable. Locate the server by its IP address, pull it offline and patch it.
Note: If you have SSL servers listening on different ports, Endace has a protocol identification module built in, so filtering on SSL within Vision will capture all the SSL packets of interest regardless of port number!
Have I been exploited? Until April 7, this bug had been undiscovered publicly , but it has existed in versions of the OpenSSL code for more than two years.
It is therefore very difficult for an organization to fully determine its overall risk of having been exploited if someone discovered the bug earlier and has been using it nefariously.
But what we do know is that the bad guys are most certainly monitoring vulnerability releases, especially ones that are accompanied by simple-to-use exploit code!
Fortunately that EndaceProbe INR you have sitting behind your firewall will have captured percent of the traffic from the last few days.
Time to put it to use! From step one above, you now hopefully have a short list of IP addresses for servers that are vulnerable.
To make the search efficient, first look for the exploit attempt, and then for the response. This two-step process works best because: The amount of traffic into the server is typically much less than out.
It is faster to search the traffic coming in. The exploit arrives on port , so is easy to filter on that port. The response can go out on any port number.
It it is therefore much faster to find the exploit than to find the response, so only look for the response, if you know the exploit has occurred.
This filter will identify heartbeat request packets where the ssl. If you see any results from this filter, then it is time to look at the heartbeat response.
So, back to your visualization! You could just stop there and look at everything sent to the attacker on any port, but depending on how much traffic that is, you might want to step through one vulnerable server at a time.
If slow and steady is your style, then you will also filter on the source IP address of the vulnerable server detected above, with destination port taken from the heartbeat request packet.
Now, launch Endace Packets and enter the same exploit response filter you used before: ssl. Now… What have I lost? Overall size of the PDU will depend on how large the false payload size was in the exploit heartbeat request.
Time for Wireshark! What about workstations? The SSL heartbeat is symmetrical, so, in theory, an OpenSSL client can be attacked by a malicious server just as easily as a server can be attacked by a client.
This should be your next concern. Windows and Mac appear to be safe, but what about your Linux workstations? They have to go to a malicious website before you will see any exploit heartbeat requests coming to them.
Regards, Boni Bruno. Posted by Boni Bruno at PM 1 comment:. The EndaceProbe appliances, with 10Gb Ethernet 10GbE interfaces and 64TB of local storage, were deployed so that they could see, capture and record every packet on the network.
Between Tuesday at p. The dropped packet counter on the EndaceProbe recorded zero packet loss, so when I say that 72 billion packets traversed the network, I really mean 72 billion packets traversed the network and captured every single one to disk.
Those 72 billion packets translate to: 68GB of metadata that can be used to generate EndaceVision visualizations.
Users of the network consumed more than GB of iTunes traffic 7th highest on the list of application usage and GB of bit torrent 10th highest on the list.
Whether vendors should be taking this as an insight into how interesting their presentations are is an interesting question in its own right!
The ability to see traffic spikes at such a low level of resolution is critical for understanding the behavior of the network and planning for the future.
With the wrong tools, you could easily be mistaken to thinking that a 1Gbps link would be sufficient to handle InteropNet traffic. In a few clicks, we were able to show that the problem was coming from a single user Silvio, we know who you are!
So, until next year, we bid Las Vegas farewell and head home for a well deserved rest. How long should I store packet captures? How much storage should I provision to monitor a 10Gbps link?
When is NetFlow enough, and when do I need to capture at the packet level? These are questions network operations managers everywhere are asking, because unfortunately best practices for network data retention policies are hard to find.
Whereas CIOs now generally have retention policies for customer data, internal emails, and other kinds of files, and DBAs generally know how to implement those policies, the right retention policy for network capture data is less obvious.
The good news is that there are IT shops out there that are ahead of the curve and have figured a lot of this out. Some common answers include: Respond faster to difficult network issues Establish root cause and long-term resolution Contain cyber-security breaches Optimize network configuration Plan network upgrades.
You may notice that the objectives listed above vary in who might use them: stakeholders could include Network Operations, Security Operations, Risk Management, and Compliance groups, among others.
While these different teams often operate as silos in large IT shops, in best-practice organizations these groups are cooperating to create a common network-history retention policy that cuts across these silos and in the most advanced cases, they have even begun to share network-history infrastructure assets, a topic we discussed here.
Some of your objectives may be met by keeping summary information — events, statistics, or flow records for example — and others commonly require keeping partial or full packet data as well.
Generally speaking, the items at the top of the list are smaller and therefore cheaper to keep for long periods of time; while the items at the bottom are larger and more expensive to keep, but much more general.
If you have the full packet data available you can re-create any of the other items on the list as needed; without the full packet data you can answer a subset of questions.
That leads to the first principle: keep the largest objects like full packet captures for as long as you can afford which is generally not very long, because the data volumes are so large , and keep summarized data for longer.
Next, you should always take guidance from your legal adviser. The choice here will depend on how tightly controlled your network is and on what level of privacy protection your users are entitled to.
For highly controlled networks with a low privacy requirement, such as banking, government or public utilities, full packet capture is the norm. For consumer ISPs in countries with high privacy expectations, packet header capture may be more appropriate.
General enterprise networks fall somewhere in between. Whichever type of packet data is being recorded, the goal consistently stated by best-practice organizations is a minimum of 72 hours retention, to cover a 3-day weekend.
For the most tightly-controlled networks retention requirements may be 30 days, 90 days, or longer. GTP-C in mobile networks In addition to control plane traffic, in every network there are particular servers, clients, subnets, or applications that are considered particularly important or particularly problematic.
For both control-plane and network-specific traffic of interest, organizations are storing a minimum of 30 days of packet data. Email me for speaking engagements, demonstrations, training, immersion days, workshops, anything to help you be more successful!
I have extensive consulting and professional service experience. The Portfolio section of this web site has links to a lot of my posted content.
I have also worked closely with most of the tier one service providers, major studios, various US Government Agencies, and numeorus content owners in designing network and security strategies to monitor and protect high-speed networks and guard against cyber attacks.
I regularly speak at conferences, conduct executive briefings, partner workshops, and implement complex solutions for large organizations. I've also designed systems for lawful intercept and hacked contracted hacker one of the largest digital asset management systems on the planet.
Lately I've been focusing on bigdata architectures, analytics and multi-cloud integration. These experiences, along with the colleagues and customer's I've been lucky enough to work with through the years, have provided me the skills required to safeguard some of our nations critical infrastructure and affect a paradigm shift in how information is analyzed, secured, distributed, monetized and consumed.
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