CVE-2020-28049
Published: 4 November 2020
An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
sddm Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Needs triage
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| impish |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| jammy |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| kinetic |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| lunar |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| mantic |
Not vulnerable
(0.19.0-2ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.3 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
References
- https://www.openwall.com/lists/oss-security/2020/11/04/2
- https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222
- https://bugzilla.suse.com/show_bug.cgi?id=1177201
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
- https://github.com/sddm/sddm/releases
- https://www.cve.org/CVERecord?id=CVE-2020-28049
- NVD
- Launchpad
- Debian