Looking at IS-IS Security

Engineers hardly ever think of the control plane as an attack surface — from the new/old wave of centralized controllers (Rule 11!) to the middle term wave of distributed routing protocols, the control plane just hums along in the background without many people thinking about it from a security perspective. That is, until a big […]

The post Looking at IS-IS Security appeared first on Packet Pushers.

‘KeyRaider’ iOS malware targets jailbroken devices

Credentials for more than 225,000 Apple accounts have been stolen by sophisticated malware that targets modified iOS devices, according to Palo Alto Networks.The malware, which is nicknamed KeyRaider, enables attackers to download applications from Apple's App Store without paying or to lock devices in lieu of a ransom.“We believe this to be the largest known Apple account theft caused by malware,” wrote Claud Xiao of Palo Alto Networks in a blog post.Palo Alto Networks notified Apple of KeyRaider on Aug. 26 and provided the stolen account information, Xiao wrote. Apple officials in Sydney couldn't be immediately reached on Monday.To read this article in full or to leave a comment, please click here

Russian-speaking hackers breach 97 websites, many of them dating ones

Russian-speaking hackers have breached 97 websites, mostly dating-related, and stolen login credentials, putting hundreds of thousands of users at risk.Many of the websites are niche dating ones similar to Ashley Madison, according to a list compiled by Hold Security, a Wisconsin-based company that specializes in analyzing data breaches. A few are job-related sites.Batches of stolen information were found on a server by the company’s analysts, said Alex Holden, Hold Security’s founder and CTO. The server, for some reason, was not password protected, allowing analysis of its contents, he said.None of the dating sites are nearly as prominent as Ashley Madison, which saw sensitive company information, emails, internal documents and details of 30 million registered users released in a devastating data breach. Holden said this Russian-speaking group is not related to Impact Team, which claimed credit for the intrusion into Ashley Madison.To read this article in full or to leave a comment, please click here

About the systemd controversy…

As a troll, one of my favorite targets is "systemd", because it generates so much hate on both sides. For bystanders, I thought I'd explain what that is. To begin with, I'll give a little background.

An operating-system like Windows, Mac OS X, and Linux comes in two parts: a kernel and userspace. The kernel is the essential bit, though on the whole, most of the functionality is in userspace.

The word "Linux" technically only refers to the kernel itself. There are many optional userspaces that go with it. The most common is called BusyBox, a small bit of userspace functionality for the "Internet of Things" (home routers, TVs, fridges, and so on). The second most common is Android (the mobile phone system), with a Java-centric userspace on top of the Linux kernel. Finally, there are the many Linux distros for desktops/servers like RedHat Fedora and Ubuntu -- the ones that power most of the servers on the Internet. Most people think of Linux in terms of the distros, but in practice, they are a small percentage of the billions of BusyBox and Android devices out there.

The first major controversy in Linux was the use of Continue reading

6 UK teenagers arrested for allegedly using Lizard Squad’s Lizard Stresser DDoS service

The National Crime Agency (NCA), which is like a British version of the FBI, arrested six UK teenagers for allegedly using a DDoS-for-hire service to attack corporate websites. During Operation Vivarium, warrants were executed for six male teenagers – ages 15, 16, 17 and three 18-year-olds – accused of using the hacking group Lizard Squad’s Lizard Stresser tool which is capable of knocking websites offline for up to eight hours at a time.Lizard Squad took down Microsoft Xbox and Sony PlayStation networks on Christmas day; shortly thereafter, Lizard Squad released its Lizard Stresser service. According to Krebs on Security, the Lizard Stresser service “draws on Internet bandwidth from hacked home Internet routers around the globe that are protected by little more than factory-default usernames and passwords.”To read this article in full or to leave a comment, please click here

Why Cisco?

Why do i keep focusing so much on Cisco, when there are clearly alot of different vendors out there with similar products and technologies?

There are several reasons for this.

1) I began the professional part of my networking career with Cisco.
2) Cisco has a proven track record when it comes to education and learning.
3) Even though not always the best match for all use-cases, Cisco is a big player in almost all areas of networking.
4) The networking opportunities provided by Cisco is by far the best of what ive seen. Take for example the Cisco Learning Network.
5) Cisco Press is really awesome in my opinion. They have alot of really high quality books out there.
6) Great opportunities to interact with the company. By this i mean to participate in programs like Cisco Champions and different SME (Subject Matter Expert) related activities.
7) Cisco documentation is not perfect, but its hands down the best I’ve seen across multiple vendors.
8) And ofcourse Cisco Live! :)

That being said, recently i have begun to take a more neutral look at technologies. The reason being, that in this day and age, proprietary technologies become less prefered than open Continue reading

IWAN’s “Intelligent Path Control” & Using Your Backup Link

The blog I was going to post today was a blog about how PfRv3 (IWAN’s “Intelligent Path Control”) utilizes the GRE tunnel of the DMVPN underlay in order to make intelligent decisions about where to send business critical traffic based on knowledge of the health of the path that business critical traffic would take.  …… But then I started realizing that while I have dug into a lot of DMVPN stuff recently on “Networking With Fish”…. I have not even really touched “Intelligent Path Control”. So……. let’s take a giant step backward.

“Intelligent Path Control” at the WAN – what can it do for you and why do you want it?   In this blog I’m not going to try to be the definitive all encompassing guide of what all “Intelligent Path Control” is…. just enough to get us a little on the same page before we start “playing in the lab together” with it in future blogs.

primary_backup

 

 

 

 

 

 

The picture above is of a typical 1 router branch location with 2 WAN connections. One WAN connection is the primary and the other one sits there, unused, as just a backup … doing nothing Continue reading

Busting Myths – IPv6 Link Local Next Hop into BGP

In some publications it is mentioned that a link local next-hop can’t be used when redistributing routes into BGP because routers receiving the route will not know what to do with the next-hop. That is one of the reason why HSRPv2 got support for global IPv6 addresses. One such scenario is described in this link.

The topology used for this post is the following.

Topo1

I have just setup enough of the topology to prove that it works with the next-hop, so I won’t be running any pings and so on. The routers R1 and R2 have a static route for the network behind R3 and R4.

ipv6 route 2001:DB8:100::/48 GigabitEthernet0/1 FE80::5:73FF:FEA0:1

When routing towards a link local address, the exit interface must be specified. R1 then runs BGP towards R5, notice that I’m not using next-hop-self.

router bgp 100
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 2001:DB8:1::5 remote-as 100
!
address-family ipv6
redistribute static
neighbor 2001:DB8:1::5 activate
exit-address-family

If we look in the BGP RIB, we can see that the route is installed with a link local next-hop.

R1#sh bgp ipv6 uni
BGP table version is 2, local router ID is 1.1.1.1
Status codes: s suppressed,  Continue reading

Don’t Optimize the Last 5%

Robin Harris described an interesting problem in his latest blog post: while you can reduce the storage access time from milliseconds to microseconds, the whole software stack riding on top still takes over 100 milliseconds to respond. Sometimes we’re optimizing the wrong part of the stack.

Any resemblance to SDN in enterprises or the magical cost-reduction properties of multi-vendor data center fabrics is obviously purely coincidental.

No, this isn’t good code

I saw this tweet go by. No, I don't think it's good code:




What this code is trying to solve is the "integer overflow" vulnerability. I don't think it solves the problem well.

The first problem is that the result is undefined. Some programmers will call safemulti_size_t() without checking the result. When they do, the code will behave differently depending on the previous value of *res. Instead, the code should return a defined value in this case, such as zero or SIZE_MAX. Knowing that this sort of thing will usually be used for memory allocations, which you want to have fail, then a good choice would be SIZE_MAX.

The worse problem is integer division. On today's Intel processors, integer multiplication takes a single clock cycle, but integer division takes between 40 and 100 clock cycles. Since you'll be usually dividing by small numbers, it's likely to be closer to 40 clock cycles rather than 100, but that's still really bad. If your solution to security problems is by imposing unacceptable tradeoffs, then you are doing security wrong. If you introduced this level of performance Continue reading

Yet Another new BGP NLRI: BGP-LS

Yes, that’s right, we have another new BGP NLRI: BGP-LS. In this post we will be looking at BGP with Link State (LS) extension which is an integral part of the Carrier SDN strategy. We will look at why we need BGP-LS, its internals and its applications. What I won’t cover is things like do we need SDN?, […]

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Microsoft may offer some Windows 10 patch notes to enterprises

IT administrators may get more information than originally planned about Windows 10 patches, as Microsoft ponders how much to tell business customers about modifications to the new OS."We've heard that feedback from enterprise customers so we're actively working on how we provide them with information about what's changing and what new capabilities and new value they're getting," Jim Alkove, a vice president in the Windows group, said during a press briefing. It's a change in tone for the company, which previously said that it wouldn't provide detailed information about most Windows 10 patches. That original plan was bad news for IT managers and users who want to know what an update does before they install it. This is more of an issue now that Microsoft is supposed to release more frequent updates over the lifetime of Windows 10, as part of its "Windows as a service" plans, than it did for previous editions of Windows.To read this article in full or to leave a comment, please click here

On science literacy…

In this WIRED article, a scientifically illiterate writer explains "science literacy". It's as horrid as you'd expect. He preaches the Aristotelian version of science that Galileo proved wrong centuries ago. His thesis is that science isn't about knowing scientific facts, but being able to think scientifically. He then claims that thinking scientifically is all about building models of how the world works.

This is profoundly wrong. Science is about observation and experimental testing of theories.

For example, consider the following question. If you had two balls of the same size, one made of lead and the other made of wood, and you dropped them at the same time, which would hit the ground first (ignoring air resistance)? For thousands of years Aristotelian scientists claimed that heavier objects fell faster, purely by reasoning about the problem. It wasn't until the time of Galileo that scientists conducted the experiment and observed that these balls hit the ground at the same time. In other words, all objects fall at the same speed, regardless or size or weight (ignoring air resistance). Feathers fall as fast as lead on the moon. If you don't believe me, drop different objects from a building and observe for yourself.

The point here is Continue reading
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