CVE-2018-20839 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  9.8 CRITICAL
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H


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Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.securityfocus.com/bid/108389
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993 Issue Tracking  Third Party Advisory 
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f Patch  Third Party Advisory 
https://github.com/systemd/systemd/pull/12378 Third Party Advisory 
https://security.netapp.com/advisory/ntap-20190530-0002/

Weakness Enumeration

CWE-ID CWE Name Source
CWE-255 Credentials Management Errors cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-20839
NVD Published Date:
05/17/2019
NVD Last Modified:
05/30/2019
Source:
MITRE