Hi ! I want to demo the backdoor usage and would like to install a unstable/test version of a distribution (possibly Debian or Fedora) that had the backdoor (v5.6.0 or 5.6.1 of xz/liblzma and patched openssh for systemd notification)

How could I do that?

I will be using xzbot from amlweems to further patch liblzma but I want a distro that has openssh run by systemd that links to the correct liblzma version

Thank you!

  • Arthur BesseMAEnglish
    5·
    8 months ago

    xzbot from Anthony Weems enables to patch the corrupted liblzma to change the private key used to compare it to the signed ssh certificate, so adding this to your instructions might enable me to demonstrate sshing into the VM :)

    Fun :)

    Btw, instead of installing individual vulnerable debs as those kali instructions I linked to earlier suggest, you could also point debootstrap at the snapshot service so that you get a complete system with everything as it would’ve been in late March and then run that in a VM… or in a container. You can find various instructions for creating containers and VMs using debootstrap (eg, this one which tells you how to run a container with systemd-nspawn; but you could also do it with podman or docker or lxc). When the instructions tell you to run debootstrap, you just want to specify a snapshot URL like https://snapshot.debian.org/archive/debian/20240325T212344Z/ in place of the usual Debian repository url (typically https://deb.debian.org/debian/).