CVE-2018-20839

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    CVE-2018-20839

    Published: 17 May 2019Last Modified: 7 Aug 2026

    Summary:

    Details: 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.

    References: http://www.securityfocus.com/bid/108389, https://security.netapp.com/advisory/ntap-20190530-0002/, https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993, https://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f, https://github.com/systemd/systemd/pull/12378, https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 1e5d2d656420d0e755dbcf72aeba3c3aba54e956
    Fixed -None

    Affected versions

    242-NA

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High