CVE-2018-20839

MediumCVSS 4.3/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 4.3/10CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.securityfocus.com/bid/108389Broken Link, Third Party Advisory, VDB Entry
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993Issue Tracking, Third Party Advisory
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322fPatch
https://github.com/systemd/systemd/pull/12378Issue Tracking, Patch
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EMailing List
https://security.netapp.com/advisory/ntap-20190530-0002/Third Party Advisory
http://www.securityfocus.com/bid/108389Broken Link, Third Party Advisory, VDB Entry
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993Issue Tracking, Third Party Advisory
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322fPatch
https://github.com/systemd/systemd/pull/12378Issue Tracking, Patch
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EMailing List
https://security.netapp.com/advisory/ntap-20190530-0002/Third Party Advisory

Timeline

Published: May 17, 2019
Last modified: Jun 17, 2026
NVD status: Analyzed

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