CVE-2020-28049

Severity Score

6.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se detectó un problema en SDDM versiones anteriores a 0.19.0. 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. 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. Esto es causado por una condición de carrera durante la creación del archivo Xauthority

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-11-02 CVE Reserved
2020-11-04 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (8)

URL	Tag	Source
https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog	Release Notes
https://github.com/sddm/sddm/releases	Release Notes
https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html	Mailing List

URL	Date	SRC
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049	2024-08-04

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html	2024-02-03
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S	2024-02-03
https://security.gentoo.org/glsa/202402-02	2024-02-03
https://www.debian.org/security/2020/dsa-4783	2024-02-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Sddm Project Search vendor "Sddm Project"		Sddm Search vendor "Sddm Project" for product "Sddm"				< 0.19.0 Search vendor "Sddm Project" for product "Sddm" and version " < 0.19.0"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.2 Search vendor "Opensuse" for product "Leap" and version "15.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected