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Cisco 650-328 : SP Video Phase II Cable Headend and Hub Exam

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Exam Number : 650-328
Exam Name : SP Video Phase II Cable Headend and Hub
Vendor Name : Cisco
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Cisco Phase test

a way to Dissect odd Protocols for Troubleshooting OT security | 650-328 actual Questions and Study Guide

summary

in this blog, we look at the steps concerned in constructing a dissector for a true-world use case, the generic Cisco Nexus protocol. We’ve additionally posted a plug-in on GitHub to support the protection neighborhood at enormous. no matter if you’re a protection researcher yourself, or you manipulate networks for an asset proprietor, this methodology and plug-in will assist you troubleshoot networking concerns and enrich standard OT protection.

How to Dissect Unusual Protocols for Troubleshooting OT Security

the way to Dissect extraordinary Protocols for Troubleshooting OT security

As OT protection researchers, the Nozomi Networks Labs team perpetually works to understand OT and IoT gadget strategies and their security risks. This comprises knowing how belongings like embedded controllers talk with every different and their workstations. To achieve this, we need to reverse undocumented protocols.

unluckily, the manner of dissection can’t be standardized as a result of the unknown layers of complexity put in place through most providers when they design methods. this is the place the journey of security researchers can make a huge change.

this is the primary of a collection of articles from Nozomi Networks Labs where we’ll demonstrate a way to use Lua APIs to instruct Wireshark to safely dissect an undocumented protocol.

during this blog, we seem to be at the steps concerned in developing a dissector for a real-world use case, the typical Cisco Nexus protocol. We’ve additionally posted a plug-in on GitHub to help the security neighborhood at tremendous.

no matter if you’re a protection researcher your self, or you control networks for an asset owner, this methodology and plug-in will aid you troubleshoot networking concerns and enhance overall OT protection.

opting for a way to dissect unknown protocols

certainly one of equipment regular to kick-start the exploration method for an unknown protocol is Wireshark.

With the right set of site visitors/Pcaps–generated by using forcing a particular type of communication between controllers–we can delivery inspecting the protocol.

We begin by using focusing our consideration on patterns. invariably, after we start the protocol reverse engineering manner, we’re confronted by way of an unknown language. We need to identify key elements so that it will help us consider the conversation structure step-by way of-step (lengths, feature codes, sequence numbers, crc, and so forth.).

while making assumptions throughout this section, it helps to leverage one of Wireshark’s capabilities referred to as plugins. These are scripts written in the Lua programming language that coach the device to dissect each and every packet the use of our findings. Plugins also enable us to validate findings with the accumulated and/or are living traffic.

TIP: you could additionally create your personal dissectors directly the use of the native Wireshark c program language in instances the place performance has to be high-quality-tuned.

home windows: %APPDATA%\Wireshark\plugins

Unix: ~/.local/lib/wireshark/plugins

Mac: ~/.config/wireshark/plugins

As that you can think about, the methods concerned in gaining an entire figuring out of an unknown verbal exchange language will also be tedious and time-consuming. although, the end result is shareable capabilities (within the form of a plugin) that’s enormously helpful to others.

as an example, utility operators can improvement incredibly from tools like this anytime they should troubleshoot certain situations within a standard industrial system operation.

rather than describe the way to develop a Lua dissector from scratch (there’s already a lot of quite simply-found documentation obtainable, see the tip beneath), we’ll dive into some specific non-typical actual world use situations and the way to cope with them.

TIP: For these simply starting their Lua dissection experience, take a glance to Mika’s tech weblog: making a Wireshark dissector in Lua – half 1 (the basics).

Registering a brand new dissector Ethertype and do not forget

Our first challenge comprises coping with protocols that aren’t readily accessible through Wireshark – at least now not in the typical way we’re used to.

Let’s use Cisco Nexus for example–a familiar protocol used between the NX-OS change sequence. We’ll go during the steps panic in constructing the related dissector (notice we also reverse engineered its inner constitution).

First, the research group seen that Wireshark doesn’t assist the dissection of this sort of protocol. This capacity we should do a little of investigation and packet analysis in an effort to be mindful its constitution.

so far as Wireshark is aware of, we have an 802.1Q digital Lan frame. here's a everyday standard for outlining VLANs (digital LAN) with an exquisite primary constitution.

The VLAN identification in region [0x8905] is non-commonplace. this is why the tool classifies it as an “unknown” category. Let’s anticipate that that can be a very good first indicator for a proprietary protocol, and preserve it in intellect for later.

After a bit of of deeper analysis on some unique patterns within the “facts” content of the packet, we decided that the constitution is a good deal less difficult than anticipated. And, from a particular element, it is terribly corresponding to an extra ordinary protocol within the industrial box. This proprietary protocol is in fact a mix of a supplier specific layer, plus a well known protocol.

trace: Do those 0x88a4 bytes ring a bell?

thankfully, the encapsulated protocol is already wide-spread by way of Wireshark. This means that we have to educate the device to subscribe (or tag) the unknown layer to adequately and accurately observe it anytime it’s seen over the wire.

Now, do not forget the found out encapsulated dissector mentioned earlier.

Let’s delivery by way of writing down some code. First, we need to coach Wireshark to hyperlink to our dissector anytime it sees any ethernet packet with the unknown class identity: 0x8905.

To hyperlink thoroughly, we will force the `DissectorTable.get()` feature to point in the specific frame area via indicating that we’re interested in referencing only the `ethertype` parameter [aka Type ID] and never the average udp/tcp.port.

-- initialize wrapper fields-- wrapper main functionfunction cisco_nexus.dissector (buf, pkt, root)

conclusion

-- subscribe for Ethernet packets on class 0x8905.native eth_table = DissectorTable.get("ethertype")eth_table:add(0x8905, cisco_nexus)

subsequent, we need to initialize a second dissector table that we’re going to consider at a selected offset. For this one, we’ll use a special strategy: Lua offers us the ability to point at a specific frequent dissector each time we want it by using the get_dissector() feature, and then use it in the course of the name() feature.

Let’s see these capabilities in motion.

since the nested protocol has a defined VLAN tag within the 802.1Q IEEE common, we will store the DissectorTable regarding it within the `original_vlan_dissector` variable on the initialization section of our script:

-- load 802.1Q digital LAN dissectororiginal_vlan_dissector = DissectorTable.get("ethertype"):get_dissector(0x8100)

after which call it at the appropriate offset after the Cisco Nexus header, inside the context of the leading dissection characteristic, precisely after the 4 header bytes:

TIP: the first size examine is performed to ensure that we keep away from any 0 byte packets, in case some are discovered.

-- wrapper leading functionfunction cisco_nexus.dissector (buf, pkt, root)-- validate packet length is enough, in any other case quit

if buf:len() == 0 then return endpkt.cols.protocol = cisco_nexus.identify

-- create subtree for Cisco Nexussubtree = root:add(cisco_nexus, buf())

-- subscribes ECAT dissectororiginal_vlan_dissector:call(buf:latitude(four,buf:len()-4):tvb(), pkt, subtree)

conclusion

The last effect is a complete dissection of the total packet constitution.

earlier than: Detection of an unknown protocol After: remaining dissection of the unknown protocol’s inner constitution

the usage of the Cisco Nexus Protocol to create the Cisco Nexus Dissector Plugin

listed here, we showed a way to with ease manage favourite and unknown layer 2 frames using Lua APIs, with the aid of instructing Wireshark to appropriately dissect them whereas the evaluation is being accomplished. as an example this, Nozomi Networks researchers used a real-world illustration of a previously unknown protocol: Cisco Nexus.

all over the heritage evaluation, the crew discovered that the proprietary protocol encapsulated a well-defined communication constitution. We then leveraged this advantage to examine right here combos of DissectorTable functions:

.get(v1)

.get(v1):get_dissector(v2)

.get(v1):get_dissector(v2):call(v3,v4,v5)

The outcome of our research is a plugin referred to as the Cisco Nexus Dissector. We’ve posted it in GitHub to aid asset owners troubleshoot actions within their own networks. The world protection group can additionally use it to extra their analysis and analysis initiatives.

next month, Nozomi Networks Labs will examine the way to create a plugin for an extra unknown protocol found in a generally-used industrial communications device. live tuned!

about the writer

Younes Dragoni is a member of the area economic discussion board’s international Shaper neighborhood, a world community of young individuals actively shaping our future through solution constructing, coverage-making and lasting alternate. His fascination with desktop security, and desire to be on the offensive side, all started decades in the past. Now, as security Researcher with Nozomi Networks, Younes flourishes on searching down vulnerabilities in automation contraptions (ICS/SCADA) and examining malicious application to be aware the character of threats to industrial operations.

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