Executive Summary

Informations
Name CVE-2018-20839 First vendor Publication 2019-05-17
Vendor Cve Last vendor Modification 2023-11-07

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 9.8
Base Score 9.8 Environmental Score 9.8
impact SubScore 5.9 Temporal Score 9.8
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20839

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-200 Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Application 1
Application 1

Sources (Detail)

https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0...
Source Url
BID http://www.securityfocus.com/bid/108389
CONFIRM https://security.netapp.com/advisory/ntap-20190530-0002/
MISC https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622ae...
https://github.com/systemd/systemd/pull/12378

Alert History

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Date Informations
2023-11-07 21:40:06
  • Multiple Updates
2022-02-20 12:37:09
  • Multiple Updates
2022-01-29 00:23:17
  • Multiple Updates
2021-05-04 13:14:38
  • Multiple Updates
2021-04-22 02:29:38
  • Multiple Updates
2021-03-26 12:26:22
  • Multiple Updates
2020-09-03 01:22:59
  • Multiple Updates
2020-05-23 01:12:50
  • Multiple Updates
2019-05-30 17:19:15
  • Multiple Updates
2019-05-21 13:19:00
  • Multiple Updates
2019-05-21 00:19:07
  • Multiple Updates
2019-05-17 09:18:22
  • First insertion