** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Hirsute)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Impish)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1949516
Title:
require CAP_NET_ADMIN to attach N_HCI ldisc
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
Fix Committed
Status in linux source package in Impish:
Fix Committed
Status in linux source package in Jammy:
In Progress
Bug description:
[Impact]
Any unprivileged user can attach N_HCI ldisc and send packets coming from a
virtual controller by using PTYs. This exposes attack surface on systems
where bluetooth is not needed or even allow local attacks that would otherwise
require physical proximity.
[Test case]
Try attaching N_HCI ldisc to a tty.
ldattach HCI /dev/tty
[Potential regression]
Users who rely on programs using N_HCI line discipline in order to emulate or
proxy a bluetooth controller will require privilege they may not have.
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