CVE-2018-20839
Last modified
CVE-2018-20839 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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.. EPSS estimates a 2.48% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Systemd Project | Systemd | 242 |
| Netapp | Cn1610 Firmware | All versions |
| Netapp | Snapprotect | All versions |
| Netapp | Solidfire \& Hci Management Node | All versions |
References
- http://www.securityfocus.com/bid/108389Broken Link, Third Party Advisory, VDB Entry
- https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993Issue Tracking, Third Party Advisory
- https://github.com/systemd/systemd/pull/12378Issue Tracking, Patch
- https://security.netapp.com/advisory/ntap-20190530-0002/Third Party Advisory
- http://www.securityfocus.com/bid/108389Broken Link, Third Party Advisory, VDB Entry
- https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993Issue Tracking, Third Party Advisory
- https://github.com/systemd/systemd/pull/12378Issue Tracking, Patch
- https://security.netapp.com/advisory/ntap-20190530-0002/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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