Home/CVE/systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certain circumstan
CVE

CVE-2018-20839

systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certain circumstan

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.

MEDIUM · CVSS 4.3 EPSS 0.0063
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
▤

Affected Products & Versions

4
systemd project systemdall versions
netapp cn1610 firmwareall versions
netapp snapprotectall versions
netapp solidfire \& hci management nodeall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSystemd Service Creation
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD17 May 2019 · 04:29 AM
CVSS VectorCVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.securityfocus.com/bid/108389Broken LinkThird Party AdvisoryVDB Entry
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993Issue TrackingThird Party Advisory
https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322fPatch
https://github.com/systemd/systemd/pull/12378Issue TrackingPatch
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3EMailing List
https://security.netapp.com/advisory/ntap-20190530-0002/Third Party Advisory
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