Misc

Local Packet Filtering with IPv6

Just recently we discussed IPv6 filter rules for NIC-level firewalls (in a virtualized data center) with a customer. I’d like to take this as an opportunity to lay out potential approaches for local packet filtering of IPv6, which in turn might somewhat depend on the address configuration strategy chosen for the respective systems (for the latter you may refer to this post or to this talk from the Troopers NGI event).

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Misc

GDPR and Pseudonymisation – Easing the Pain of Regulation

27 April 2016 marked a turning point for a lot of countries as well as a lot businesses worldwide: EU regulation 2016/679 (going by it’s more widely known name General Data Protection Regulation and abbreviated GDPR) was adopted by the European Parliament, the Council as well as the Commission [1]. Especially readers from countries outside of the EU might ask “Why should this be of interest for me?”. Continue reading “GDPR and Pseudonymisation – Easing the Pain of Regulation”

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Misc

6th No-Spy Conference

Last friday Florian and me attended the 6th No-Spy Conference in Stuttgart, Germany. We gave a talk about surveillance and censorship on modern devices in North Korea and discussed various aspects with the attendees. The atmosphere was very welcoming and we had some nice discussions about various topics which allowed us to better clarify some things. The slides are available here.

Thanks to the organizers for having us!

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Misc

One Step Closer – RDNSS (RFC 8106) Support in Windows 10 Creators Update

Good Afternoon,

It is a pleasant surprise for many (us included) that Microsoft implemented support for the RDNSS (RFC 8106) option in Router Advertisements beginning with the Windows 10 Creators Update. Interestingly, I wasn’t able to find any official documents from Microsoft stating this. As we are involved in a lot of IPv6 related projects for our customers, the lack of RDNSS support for Windows and DHCPv6 for Android is a major pain point when implementing IPv6 in mixed client segments, as you need to implement both mechanisms to ensure that all clients do get the relevant network parameters. I won’t beat on the dead horse, but Microsoft’s decision is a huge step in the right direction and one can hope that one day Google finds a “compelling use case” to implement at least stateless DHCPv6 for Android. Continue reading “One Step Closer – RDNSS (RFC 8106) Support in Windows 10 Creators Update”

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Misc

(Mostly) New, Interesting, and Security-focused Open Source Projects

Troopers ’17 – the 10th edition – madness is over and hopefully all of you are well rested and recovered after this special week. Of course the rest of the world did not stand still and thus Google lifted the curtains on a new public portal collecting and promoting the Open Source Software projects developed by employees of Google: opensource.google.com. There are a lot of interesting projects that might incubate new interesting developments. And even security oriented tools and projects (51 at the time of writing to be precise) are publically available Continue reading “(Mostly) New, Interesting, and Security-focused Open Source Projects”

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Misc

Exploitation of IMS in absence of confidentiality and integrity protection

IP Multimedia Subsystem (IMS) offers many multimedia services to any IP-based access network, such as LTE or DSL. In addition to VoLTE, IMS adds service provider flexibility, better QoS and charging control to the 4th generation of mobile networks. IMS exchanges SIP messages with its users or other IMS and usually these communications are secured by TLS or IPSec. But if an attacker manages to break the confidentiality and the integrity with IMS, he would find it vulnerable to several attacks. Continue reading “Exploitation of IMS in absence of confidentiality and integrity protection”

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