sigma star gmbh dev log


Docker to the rescue in an unexpected way

Imagine you find yourself in a restricted environment and you need some Linux rootfs that runs on the embedded system you just managed get access to. Of course the CPU architecture of the embedded system is not the same as your workstation. The circumstances are further complicated by the fact that the userspace should offer enough tooling to build a C/C++ application. In such a situation docker can help, but in an unexpected way.


The condemned live longer: Symlink races

In this blog post we will take a closer look at a symlink race vulnerability from 2018 in docker. We think the vulnerability is quite interesting since it is easy to exploit but not so obvious to find while reviewing. Attentive readers may ask themselves whether they’d have noticed the issue while developing or reviewing the affected lines of code.