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    CVE-2020-28049

    An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.

    Published:Nov 4, 2020
    Last Modified:Nov 21, 2024
    EPS:Nov 4, 2020
    EPSS Score:0.00037
    CVSS Score:6.3

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Sddm Project
    Product
    Sddm

    Exploits

    https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049

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    References

    http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html
    https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049
    https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
    https://github.com/sddm/sddm/releases
    https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
    https://security.gentoo.org/glsa/202402-02
    https://www.debian.org/security/2020/dsa-4783
    http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html
    https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049
    https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
    https://github.com/sddm/sddm/releases
    https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
    https://security.gentoo.org/glsa/202402-02
    https://www.debian.org/security/2020/dsa-4783

    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