Impact: Important Public Date: 2019-05-17 CWE: CWE-200 Bugzilla: 1716955: CVE-2018-20839 systemd: mishandling of the current keyboard mode check leading to passwords being disclosed in cleartext to attacker 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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-20839 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.6 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 8 | systemd | Under investigation |
| Red Hat Enterprise Linux 7 | systemd | Under investigation |
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