CVE-2018-20839
Published: 17 May 2019
systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certain circumstances, such as watching a shutdown, or using Ctrl-Alt-F1 and Ctrl-Alt-F2. This occurs because the KDGKBMODE (aka current keyboard mode) check is mishandled.
Notes
| Author | Note |
|---|---|
| seth-arnold | Possible regression when running startx manually |
| mdeslaur | commit was reverted in (240-6ubuntu7) possibly a bug in plymouth, not systemd as of 2021-04-12, we can no longer reproduce this issue with all updates applied. I am therefore marking this CVE as not affecting systemd and closing it out. This was possibly fixed by the plymouth change in bug 1817738. |
Priority
Medium
CVSS 3 base score: 9.8
Status
| Package | Release | Status |
|---|---|---|
|
systemd Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
|
| cosmic |
Ignored
(reached end-of-life)
|
|
| disco |
Ignored
(reached end-of-life)
|
|
| eoan |
Ignored
(reached end-of-life)
|
|
| focal |
Not vulnerable
|
|
| groovy |
Not vulnerable
|
|
| hirsute |
Not vulnerable
|
|
| impish |
Not vulnerable
|
|
| jammy |
Not vulnerable
|
|
| precise |
Does not exist
|
|
| trusty |
Not vulnerable
|
|
| upstream |
Needed
|
|
| xenial |
Not vulnerable
|
|
|
Patches: upstream: https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f upstream: https://github.com/systemd/systemd/commit/bb5ac84d79ac3aef606a4a9eeaafef94a1f199be upstream: https://github.com/systemd/systemd/commit/13a43c73d8cbac4b65472de04bb88ea1bacdeb89 |
||