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.
{
"binaries": [
{
"binary_name": "gdm3",
"binary_version": "3.28.3-0ubuntu18.04.6"
},
{
"binary_name": "gir1.2-gdm-1.0",
"binary_version": "3.28.3-0ubuntu18.04.6"
},
{
"binary_name": "libgdm1",
"binary_version": "3.28.3-0ubuntu18.04.6"
}
],
"availability": "No subscription required"
}
{
"binaries": [
{
"binary_name": "gdm3",
"binary_version": "3.36.3-0ubuntu0.20.04.2"
},
{
"binary_name": "gir1.2-gdm-1.0",
"binary_version": "3.36.3-0ubuntu0.20.04.2"
},
{
"binary_name": "libgdm1",
"binary_version": "3.36.3-0ubuntu0.20.04.2"
}
],
"availability": "No subscription required"
}