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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | plymouth | 0.9.4-1 | — |
| Debian 13 | plymouth | 0.9.4-1 | — |
| Debian 12 | plymouth | 0.9.4-1 | — |
References
- https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993
- https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f
- https://github.com/systemd/systemd/pull/12378
- 108389 vdb-entry
- https://security.netapp.com/advisory/ntap-20190530-0002/
- [mina-dev] 20210225 [jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar mailing-list