CVE-2017-15131
Published: 9 January 2018
It was found that system umask policy is not being honored when creating XDG user directories, since Xsession sources xdg-user-dirs.sh before setting umask policy. This only affects xdg-user-dirs before 0.15.5 as shipped with Red Hat Enterprise Linux.
Notes
| Author | Note |
|---|---|
| seth-arnold | This feels like a fundamental misunderstanding of Unix model to assume that every task run on behalf of a user will be started as a child process of bash or sh run as an interactive or login shell. Environments that want a specific umask set for users should use the pam_umask(8) module as part of the login process. Environments that need a specific umask set for compliance reasons should investigate the feasibility of preparing a single-purpose LSM or seccomp jail interface of some sort. |
| rodrigo-zaiden | pam_umask is being used to set umask when an interactive session is started, so Ubuntu is not affected by this CVE. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
xdg-user-dirs Launchpad, Ubuntu, Debian |
artful |
Ignored
(end of life)
|
| bionic |
Not vulnerable
|
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Not vulnerable
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Not vulnerable
|
|
| jammy |
Needs triage
|
|
| kinetic |
Not vulnerable
|
|
| lunar |
Not vulnerable
|
|
| mantic |
Not vulnerable
|
|
| trusty |
Does not exist
(trusty was needs-triage)
|
|
| upstream |
Not vulnerable
(Red Hat specific)
|
|
| xenial |
Not vulnerable
|
|
| zesty |
Ignored
(end of life)
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |