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CVE-2018-20839

Publication date 17 May 2019

Last updated 28 October 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.3 · Medium

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
systemd 22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
19.10 eoan Ignored end of life
19.04 disco Ignored end of life
18.10 cosmic Ignored end of life
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

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.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
systemd

Severity score breakdown

Parameter Value
Base score 4.3 · Medium
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N