LXD has arbitrary file write on host via `exec-output` symlink in crafted image

Reported from https://github.com/lxc/incus/security/advisories/GHSA-48q5-w887-33wv Summary The record-output parameter of the /instances/$name/exec endpoint stores the output of the command in the exec-output directory of the instance. If exec-output is a symlink, file named execUUID.stdout and...