Vulnerability Name:

CVE-2018-20839 (CCN-161627)

Assigned:2019-05-16
Published:2019-05-16
Updated:2022-02-20
Summary: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.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): Low
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-200
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2018-20839

Source: BID
Type: Third Party Advisory, VDB Entry
108389

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993

Source: XF
Type: UNKNOWN
systemd-cve201820839-info-disc(161627)

Source: CCN
Type: systemd GIT Repository
Merge pull request #12378 from rbalint/vt-kbd-reset-check

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f

Source: MISC
Type: Third Party Advisory
https://github.com/systemd/systemd/pull/12378

Source: MLIST
Type: Mailing List, Third Party Advisory
[mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar

Source: CONFIRM
Type: Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20190530-0002/

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2018-20839

Vulnerable Configuration:Configuration 1:
  • cpe:/a:systemd_project:systemd:242:-:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:netapp:cn1610_firmware:-:*:*:*:*:*:*:*
  • AND
  • cpe:/h:netapp:cn1610:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/a:netapp:snapprotect:-:*:*:*:*:*:*:*
  • OR cpe:/a:netapp:solidfire_&_hci_management_node:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:systemd_project:systemd:242:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.cosmic:def:2018208390000000
    V
    		CVE-2018-20839 on Ubuntu 18.10 (cosmic) - medium.
    2019-05-17
    oval:com.ubuntu.bionic:def:2018208390000000
    V
    		CVE-2018-20839 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-05-17
    oval:com.ubuntu.xenial:def:2018208390000000
    V
    		CVE-2018-20839 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-05-17
    oval:com.ubuntu.disco:def:2018208390000000
    V
    		CVE-2018-20839 on Ubuntu 19.04 (disco) - medium.
    2019-05-17
    BACK
    systemd_project systemd 242 -
    netapp cn1610 firmware -
    netapp cn1610 -
    netapp snapprotect -
    netapp solidfire & hci management node -
    systemd_project systemd 242 -