An Improper Input Validation vulnerability exists in the user websocket handler of MAAS. An authenticated, unprivileged attacker can intercept a user.update websocket request and inject the issuperuser property set to true. The server improperly validates this input, allowing the attacker to self-promote to an administrator role. This results in full administrative control over the MAAS deployment.

maas-import-pxe-files in MAAS before 13.10 does not verify the integrity of downloaded files, which allows remote attackers to modify these files via a man-in-the-middle (MITM) attack.