Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Affects: linux (Ubuntu Bionic)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Affects: linux (Ubuntu Focal)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Affects: linux (Ubuntu Hirsute)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Affects: linux (Ubuntu Impish)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Affects: linux (Ubuntu Jammy)
Importance: Low
Assignee: Thadeu Lima de Souza Cascardo (cascardo)
Status: In Progress
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux (Ubuntu Impish)
Status: New => In Progress
** Changed in: linux (Ubuntu Hirsute)
Status: New => In Progress
** Changed in: linux (Ubuntu Jammy)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Impish)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Hirsute)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Impish)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Low
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Low
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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:
In Progress
Status in linux source package in Focal:
In Progress
Status in linux source package in Hirsute:
In Progress
Status in linux source package in Impish:
In Progress
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1949516/+subscriptions
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