Kevin Backhouse discovered that GDM incorrectly launched the initial setup tool when the accountsservice daemon was not reachable. A local attacker able to cause accountsservice to crash or stop responding could trick GDM into launching the initial setup tool and create a privileged user.
{ "availability": "No subscription required", "binaries": [ { "gdm3-dbgsym": "3.28.3-0ubuntu18.04.6", "gir1.2-gdm-1.0": "3.28.3-0ubuntu18.04.6", "gdm3": "3.28.3-0ubuntu18.04.6", "libgdm-dev": "3.28.3-0ubuntu18.04.6", "libgdm1": "3.28.3-0ubuntu18.04.6", "libgdm1-dbgsym": "3.28.3-0ubuntu18.04.6" } ] }
{ "availability": "No subscription required", "binaries": [ { "gdm3-dbgsym": "3.36.3-0ubuntu0.20.04.2", "gir1.2-gdm-1.0": "3.36.3-0ubuntu0.20.04.2", "gdm3": "3.36.3-0ubuntu0.20.04.2", "libgdm-dev": "3.36.3-0ubuntu0.20.04.2", "libgdm1": "3.36.3-0ubuntu0.20.04.2", "libgdm1-dbgsym": "3.36.3-0ubuntu0.20.04.2" } ] }