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This affects any Incus user in an environment where an unprivileged user may have root access to a container with an attached custom storage volume that has the security.shifted property set to true as well as access to the host as an unprivileged user.
The most common case for this would be systems using incus-user with the less privileged incus group to provide unprivileged users with an isolated restricted access to Incus. Such users may be able to create a custom storage volume with the necessary property (depending on kernel and filesystem support) and can then write a setuid binary from within the container which can be executed as an unpriivleged user on the host to gain root privileges.
Patches
A patch for this issue is available here: lxc/incus#2642
The first commit changes the permissions for any new storage pool, the second commit applies it on startup to all existing storage pools.
Workarounds
Permissions can be manually restricted until a patched version of Incus is deployed.
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This PR contains the following updates:
6.18.0->6.19.0Warning
Some dependencies could not be looked up. Check the Dependency Dashboard for more information.
Release Notes
lxc/incus (lxc/incus)
v6.19.0: Incus 6.19Compare Source
What's Changed
incus admin oson all platforms by @stgraber in #2635internal/utilby @dector in #2655storage volume file mountcommand by @presztak in #2683New Contributors
Full Changelog: lxc/incus@v6.18.0...v6.19.0
Configuration
📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
This PR has been generated by Renovate Bot.