4.3
MEDIUM
CVE-2018-20839
OpenSSH systemd VT1 Cleartext Password Disclosure
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.

INFO

Published Date :

May 17, 2019, 4:29 a.m.

Last Modified :

Oct. 24, 2024, 5:34 p.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

3.6

Exploitability Score :

0.7
Public PoC/Exploit Available at Github

CVE-2018-20839 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2018-20839 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Netapp solidfire_\&_hci_management_node
2 Netapp cn1610_firmware
3 Netapp snapprotect
4 Netapp cn1610
1 Systemd_project systemd
: Total Affected Vendor : 2 | Products : 5
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2018-20839.

URL Resource
http://www.securityfocus.com/bid/108389 Broken Link Third Party Advisory VDB Entry
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993 Issue Tracking Third Party Advisory
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f Patch
https://github.com/systemd/systemd/pull/12378 Issue Tracking Patch
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E Mailing List
https://security.netapp.com/advisory/ntap-20190530-0002/ Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
juaromu/wazuh-snyk

None

Shell

Updated: 1 year, 7 months ago
2 stars 2 fork 2 watcher
Born at : Nov. 11, 2021, 4:10 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
garethr/snykout

A command line tool which provides an alternative interface to snyk test

snyk

Makefile Dockerfile Crystal Open Policy Agent

Updated: 2 years, 9 months ago
4 stars 3 fork 3 watcher
Born at : Aug. 31, 2020, 8:31 a.m. This repo has been linked 82 different CVEs too.
Profile Photo
revl-ca/scan-docker-image

None

Shell

Updated: 5 years, 4 months ago
0 stars 0 fork 0 watcher
Born at : July 18, 2019, 10:49 p.m. This repo has been linked 124 different CVEs too.
Profile Photo
simonsdave/clair-cicd

Making CoreOS' Clair easily work in CI/CD pipelines

security-tools security-audit dev-ops ci-cd clair static-analysis docker vulnerabilities

Shell Python Dockerfile Ruby

Updated: 9 months, 4 weeks ago
29 stars 8 fork 8 watcher
Born at : May 13, 2016, 7:04 p.m. This repo has been linked 7 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2018-20839 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2018-20839 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Modified Analysis by [email protected]

    Oct. 24, 2024

    Action Type Old Value New Value
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    Changed Reference Type http://www.securityfocus.com/bid/108389 Third Party Advisory, VDB Entry http://www.securityfocus.com/bid/108389 Broken Link, Third Party Advisory, VDB Entry
    Changed Reference Type https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f Patch, Third Party Advisory https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f Patch
    Changed Reference Type https://github.com/systemd/systemd/pull/12378 Third Party Advisory https://github.com/systemd/systemd/pull/12378 Issue Tracking, Patch
    Changed Reference Type https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E No Types Assigned https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E Mailing List
    Changed Reference Type https://security.netapp.com/advisory/ntap-20190530-0002/ Patch, Third Party Advisory https://security.netapp.com/advisory/ntap-20190530-0002/ Third Party Advisory
    Removed CWE NIST CWE-200
    Added CWE NIST NVD-CWE-noinfo
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E [No types assigned]
    Removed Reference MITRE https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E
  • Modified Analysis by [email protected]

    Feb. 20, 2022

    Action Type Old Value New Value
    Removed CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N)
    Removed CVSS V3 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type http://www.securityfocus.com/bid/108389 No Types Assigned http://www.securityfocus.com/bid/108389 Third Party Advisory, VDB Entry
    Changed Reference Type https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E No Types Assigned https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E Mailing List, Third Party Advisory
    Changed Reference Type https://security.netapp.com/advisory/ntap-20190530-0002/ No Types Assigned https://security.netapp.com/advisory/ntap-20190530-0002/ Patch, Third Party Advisory
    Added CPE Configuration AND OR *cpe:2.3:o:netapp:cn1610_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:netapp:cn1610:-:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:netapp:snapprotect:-:*:*:*:*:*:*:* *cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Jan. 28, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:freedesktop:systemd:242:-:*:*:*:*:*:* OR *cpe:2.3:a:systemd_project:systemd:242:-:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Feb. 25, 2021

    Action Type Old Value New Value
    Added Reference https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E [No Types Assigned]
  • CWE Remap by [email protected]

    Aug. 24, 2020

    Action Type Old Value New Value
    Changed CWE CWE-255 CWE-200
  • CVE Modified by [email protected]

    May. 30, 2019

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20190530-0002/ [No Types Assigned]
  • CVE Modified by [email protected]

    May. 21, 2019

    Action Type Old Value New Value
    Added Reference http://www.securityfocus.com/bid/108389 [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 20, 2019

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f No Types Assigned https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f Patch, Third Party Advisory
    Changed Reference Type https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993 No Types Assigned https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993 Issue Tracking, Third Party Advisory
    Changed Reference Type https://github.com/systemd/systemd/pull/12378 No Types Assigned https://github.com/systemd/systemd/pull/12378 Third Party Advisory
    Added CWE CWE-255
    Added CPE Configuration OR *cpe:2.3:a:freedesktop:systemd:242:-:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2018-20839 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2018-20839 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.12 }} -1.50%

score

0.47358

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: