[USN-6851-1] Netplan vulnerabilities

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-6851-1
June 26, 2024

netplan.io vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Netplan could reveal secrets or execute commands with specially crafted
configuration file.

Software Description:
- netplan.io: Declarative network configuration for various backends

Details:

Andreas Hasenack discovered that netplan incorrectly handled the permissions
for netdev files containing wireguard configuration. An attacker could use this to obtain
wireguard secret keys.

It was discovered that netplan configuration could be manipulated into injecting
arbitrary commands while setting up network interfaces. An attacker could
use this to execute arbitrary commands or escalate privileges.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  libnetplan1                     1.0-2ubuntu1.1
  netplan-generator               1.0-2ubuntu1.1
  netplan.io                      1.0-2ubuntu1.1

Ubuntu 23.10
  libnetplan0                     0.107-5ubuntu0.3
  netplan-generator               0.107-5ubuntu0.3
  netplan.io                      0.107-5ubuntu0.3

Ubuntu 22.04 LTS
  libnetplan0                     0.106.1-7ubuntu0.22.04.3
  netplan.io                      0.106.1-7ubuntu0.22.04.3

Ubuntu 20.04 LTS
  libnetplan0                     0.104-0ubuntu2~20.04.5
  netplan.io                      0.104-0ubuntu2~20.04.5

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-6851-1
  CVE-2022-4968, https://launchpad.net/bugs/1987842, https://launchpad.net/bugs/2065738, https://launchpad.net/bugs/2066258

Package Information:
  https://launchpad.net/ubuntu/+source/netplan.io/1.0-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/netplan.io/0.107-5ubuntu0.3
  https://launchpad.net/ubuntu/+source/netplan.io/0.106.1-7ubuntu0.22.04.3
  https://launchpad.net/ubuntu/+source/netplan.io/0.104-0ubuntu2~20.04.5

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