Some outright rants from a bunch of infosec practitioners.

This is the third – and hence presumably last – part of the series of posts on IPv6 address planning (first part can be found here, second one here). It’s split into three main pieces. In the beginning I will lay out some general objectives to be considered when designing an address plan. Then I’ll have a look at potential hierarchy levels and finally I’ll discuss some real-life samples we’ve seen recently.


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On Saturday, April 26 Microsoft announced that Internet Explorer version 6 until version 11 is under potential risk against drive-by attacks from malicious websites, regardless of the underlying Microsoft operating system and the associated memory protection features integrated with the operating system. Microsoft has assigned CVE-2014-1776 to this unknown use-after-free vulnerability, which in the worst case could allow remote code execution if a user views a specially crafted website. If an attacker successfully exploits this vulnerability, s/he will gain the same rights and privileges as the current user (once again, activated User Account Control [UAC] helps keeping privileges of the user low).

The recommended mitigating controls from Microsoft, especially unregistering the VGX.DLL library has led to the misunderstanding, that many people thought the vulnerability is located in the VGX.DLL library. That is wrong. Instead, the vulnerability is located in mshtml.dll, mshtml.tlb, Microsoft-windows-ie-htmlrendering.ptxml, and Wow64_microsoft-windows-ie-htmlrendering.ptxml and therefore unregistering of the above library does not globally mitigate the vulnerability. It only mitigates a specific attack vector where Vector Markup Language (VML) is being used during the attack. (more…)

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ASCII Protocol Scheme Generator

As we historically have a strong connection to network technologies (not surprising, given the “NW” in “ERNW” stands for “Networks”), I developed a small script to create RFC-style ASCII representations of protocol schemes. The following listing shows an example created for a fictitious protocol:

 0                   1                   2                   3  
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
|             type              |              id               |
|     flags     |                   reserved                    |
|                            payload                            |


The command line to create this output is

./ 16-type 16-id 8-flags 24-reserved 32-payload

and of course the script also provides a help message which explains the parameters in detail.


Enjoy and feel free to leave feedback and comments,

Benedikt :)

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Hackito Ergo Sum 2014

Greetings from Heidelberg to Paris,

and thanks for a great time at HES14! A nice venue (a museum), sweet talks and stacks of spirit carried us through the three day con. It all set off with a keynote byTROOPERs veteran Edmond ‘bigezy’ Rogers, who stuck to a quite simple principle: “People do stupid things” and I guess every single one of you has quite a few examples for that on offer. Next to every speaker referenced that statement at some point during her/his talk. Furthermore we presented an updated version of our talk LTE vs. Darwin, covering our research of security in LTE networks and potential upcoming problems.

For those who missed HES2014, we prepared a short summary of some of the talks that inspired us.


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Bruting Android Pins

Hi there,

a few weeks ago I held a talk at UnFUCK, a small University con from students for students. I had decided to give a short talk on “Owning Stuff via USB” aka how to use our TR14 Badge! During the preparations and while building my demos, I tested my new USB RubberDucky. One rather “trivial” demo was actually to use it as a keyboard on an Android phone.


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A TROOPER’s Keyboard, part2

Greetings fellow TROOPERs,

TROOPERS14 has come to an end, and it’s finally time to let you have a go at the Badge’s source code. As promised, it was slightly modified and extended, to show you the full potential of your new gadget. I’ve added some nice payloads from Nikhil Mittal and a few own ones. Above that, for those who took their parts for soldering home, I’ve also added a few quick instructions on how to do the soldering.


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A TROOPER’s Keyboard

Greetings from the Print Media Academy in Heidelberg. Just in time for TROOPERS14, I’ve got the great honor to present this years badge!




Being a TROOPER is tough: You need to know loads of information, learn even more and be able to work fast.

This year we decided to increase your efficiency and speed when collecting data from computer systems and, let’s say, hacking them! Your newest gadget is based on a plain Arduino Leonardo, modded with one of our famous shields. After adding a few LEDs and buttons, it will power up to full functionality. (more…)

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The below post was originally written on February 9th as a little educational exercise & follow-up to my BinDiff post. (This research was actually triggered by a relative asking about that strange Fritz!Box vulnerability he heard about on the radio). Once we realized the full potential of the bug we decided against publishing the post and contacted several parties instead. Amongst others this contributed to the German BSI press release. Given the cat is out of the bag now anyway, we see no reason to hold it back. We will further take this as an opportunity to lay out our basic vulnerability disclosure principles in a future post. This topic will also be discussed in the panel “Ethics of Security Work & Research” at Troopers


Fritz!Box is series of DSL and WLAN routers produced by AVM. They are extremely popular in Germany and are the uncontested market leader for private DSL customers. Recently, a significant number of Fritz!Box owners became victim of an attack that resulted in calls to expensive international numbers. The newspaper “Der Westen” reported about a case where phone calls valued over 4200€ were initiated from a compromised Fritz!Box.  Few days later AVM published a security update for a large number of Fritz!Box models and urged customers to apply the patch as soon as possible.

However, no further details about the vulnerability were published. This blog post describes our analysis of the vulnerability that we performed directly after the first updates were released.


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I recently got in contact with Intel AMT for the first time. Surely I had heard about it, knew it was “dangerous”, it was kind of exploitable and had to be deactivated. But I hadn’t actually seen it myself. Well, now I have, and I simply love it and you will probably, too (and don’t forget: love and hate are very very close to each other ;-) )
The following blogpost will be a set of features and instructions on how to own a device with an unconfigured copy of Intel AMT without using any complicated hacks or the famous magic! (more…)

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This is a guest post from Vladimir Wolstencroft from our friends of aura information security

Mobile messaging applications have been occupying people’s attention and it seems to be all the latest news. Perhaps I should have called my presentation the 19 Billion dollar app but at the time of writing and research I thought the proposed 3 Billion dollar amount for SnapChat was a little ludicrous, who could have known that would have been just a drop in the ocean.

Upon starting, I decided to compare two mobile messaging applications that shared a relatively unique capability, self-destructing messaging. However the applications execute this in two very different ways. Looking at SnapChat with it’s millions of users and supposedly secure ephemeral messaging seemed like a good start. I also wanted something a little more secure, we have all heard and seen “snaps” leaked and displayed online so I had inkling that there might have been some serious holes within the application.


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