Sensitive data could be exposed in logs of cloud-init before version 23.1.2. An attacker could use this information to find hashed passwords and possibly escalate their privilege.
{
"binaries": [
{
"binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4",
"binary_name": "cloud-init"
},
{
"binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4",
"binary_name": "ec2-init"
},
{
"binary_version": "21.1-19-gbad84ad4-0ubuntu1~16.04.4",
"binary_name": "grub-legacy-ec2"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}