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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade sddm | Jan 4, 2021 | Nov 4, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Nov 4, 2020 |
| Debian | — | Upgrade sddm | Nov 9, 2020 | Nov 4, 2020 |
| Gentoo Linux | — | Upgrade x11-misc/sddm. | Feb 5, 2024 | Nov 4, 2020 |
| Suse | — | Upgrade sddm-branding-openSUSEUpgrade sddm-branding-upstreamUpgrade sddmUpgrade sddm-branding-SLE | Feb 17, 2021 | Nov 4, 2020 |
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