CVE-2018-20839

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.

4.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.34%

Third-Party Advisory securityfocus.com Third-Party Advisory launchpad.net Third-Party Advisory netapp.com

Affected: n/a n/a

References

Link	Tags
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993	third party advisory issue tracking
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f	patch
https://github.com/systemd/systemd/pull/12378	patch issue tracking
http://www.securityfocus.com/bid/108389	broken link third party advisory vdb entry
https://security.netapp.com/advisory/ntap-20190530-0002/	third party advisory
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E	mailing list

Frequently Asked Questions

What is the severity of CVE-2018-20839?: CVE-2018-20839 has been scored as a medium severity vulnerability.
How to fix CVE-2018-20839?: To fix CVE-2018-20839, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-20839 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2018-20839 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.