CVE-2020-28049

Estado: ModificadaMedia (6.3)—

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.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Puntuación base: 6.3

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.42%
Percentil entre todas las CVEs puntuadas: 34
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (4)

Debian — Debian Linux Fedoraproject — Fedora Opensuse — Leap Sddm Project — Sddm

CWE

CWE-362
CWE-362

Referencias

JSON original (NVD)

Mostrar

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      "value": "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."
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      "lang": "es",
      "value": "Se detectó un problema en SDDM versiones anteriores a 0.19.0.&#xa0;Inicia incorrectamente el servidor X de una manera que, durante un corto período de tiempo, permite a usuarios locales no privilegiados crear una conexión con el servidor X sin proveer la autenticación apropiada.&#xa0;Un atacante local puede así acceder al contenido de la pantalla del servidor X y, por ejemplo, interceptar las pulsaciones de teclas o acceder al portapapeles.&#xa0;Esto es causado por una condición de carrera durante la creación del archivo Xauthority"
    }
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