Cyber Security Challenge in Scotland

Towards the end of August, I was part of the team who were offered to help out and participate at an exciting event held at Glasgow Caledonian University. The event ran over five days with each day varied in content and different challenges. In this post I aim to give a rough breakdown of each day and discuss what we have learned and experienced during this time. This is the first time that the Cyber Security Challenge was held in Scotland and it was successfully hosted by Glasgow Caledonian University & sponsored by BlackBerry, RBS and other companies. Read on to see how the event unfolded…

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In this paper, we review how each layer of the software stack (kernel, file system, libraries, application) influences MACB timestamps on Unix systems such as Linux, OpenBSD, FreeBSD and macOS.

We examine how POSIX specifies the timestamp behavior and propose a framework for automatically profiling OS kernels, user mode libraries and applications, including compliance checks against POSIX.

Our implementation covers four different operating systems, the GIO and Qt library, as well as several user mode applications and is released as open-source.

Based on 187 compliance tests and automated profiling covering common file operations, we found multiple unexpected and non-compliant behaviors, both on common operations and in edge cases.

Furthermore, we provide tables summarizing timestamp behavior aimed to be used by practitioners as a quick-reference.

Learn more: https://dfrws.org/presentation/a-systematic-approach-to-understanding-macb-timestamps-on-unixlike-systems/

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