CVE-2018-20839 Information disclosure in n/a
Attackers can read cleartext passwords from the terminal during logout or shutdown due to mishandled keyboard mode checks in systemd.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2018-20839?
CVE-2018-20839 is a medium-severity vulnerability in Netapp Solidfire \& Hci Management Node, published on 17 May 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2018-20839?
It affects 4 products.
Products include Netapp Cn1610 Firmware, Netapp Snapprotect, Netapp Solidfire \& Hci Management Node, Systemd Project Systemd.
How do I fix CVE-2018-20839?
Apply the vendor's patch.
Is CVE-2018-20839 being exploited?
There is no known exploitation of CVE-2018-20839 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2018-20839, GHSA-5cwj-wmj7-j224.