Improper authorization control for web services In github.com/canonical/lxd
Description
LXD has restricted project bypass leading to arbitrary command execution Reported from https://github.com/lxc/incus/security/advisories/GHSA-48q5-w887-33wv
Summary
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.
Details
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.
PoC
# 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...
Impact
Bypass of project restrictions.
Arbitrary command execution on the Incus server.
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Component | Affected version | Patched versions |
|---|---|---|---|
 go | 0.0.0-20260630083100-c5184be310b1 |
Aliases
References