CVE-2023-5536
Published: 11 December 2023
A feature in LXD (LP#1829071), affects the default configuration of Ubuntu Server which allows privileged users in the lxd group to escalate their privilege to root without requiring a sudo password.
Notes
| Author | Note |
|---|---|
| eslerm | Ubuntu Server installed with subiquity before 23.04 is affected Ubuntu Server installed with cloud-init before 24.04 is affected Ubuntu Desktop is not affected |
| eslerm | a LXD feature became a vulnerability in Ubuntu Server when it was enabled as a default cloud-init and subiquity are used for tracking, these packages merely implemented Server defaults removing this LXD feature with a security patch would break existing workflows |
| eslerm | Mitigation must be performed manually. |
Mitigation
Remove users from lxd group and configure multi-user LXD mode. https://discourse.ubuntu.com/t/easy-multi-user-lxd-setup/26215/4
Priority
Status
| Package | Release | Status |
|---|---|---|
|
cloud-init Launchpad, Ubuntu, Debian |
bionic |
Ignored
(mitigation must be performed manually)
|
| focal |
Ignored
(mitigation must be performed manually)
|
|
| jammy |
Ignored
(mitigation must be performed manually)
|
|
| lunar |
Ignored
(end of life, was ignored [mitigation must be performed manually])
|
|
| mantic |
Ignored
(mitigation must be performed manually)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Not vulnerable
(cloud-init 24.04+ not affected)
|
|
| xenial |
Ignored
(mitigation must be performed manually)
|
|
|
subiquity Launchpad, Ubuntu, Debian |
bionic |
Ignored
(mitigation must be performed manually)
|
| focal |
Ignored
(mitigation must be performed manually)
|
|
| jammy |
Ignored
(mitigation must be performed manually)
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Not vulnerable
(subiquity 23.04+ not affected)
|
|
| xenial |
Ignored
(end of standard support)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.0 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | High |
| User interaction | Required |
| Scope | Changed |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:N/A:N |