Bug#929116: systemd: CVE-2018-20839

[Salvatore Bonaccorso]

Source: systemd
Version: 241-3
Severity: important
Tags: security upstream
Forwarded: https://github.com/systemd/systemd/pull/12378

Hi,

The following vulnerability was published for systemd.

CVE-2018-20839[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-20839
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20839
[1] https://github.com/systemd/systemd/pull/12378
[2] https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f
[3] https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore