Vulnerability Details : 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 2020-11-04 19:15:12

Updated 2021-01-28 18:53:38

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-28049

Probability of exploitation activity in the next 30 days: 0.04%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 6 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2020-28049

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
3.3	LOW	AV:L/AC:M/Au:N/C:P/I:P/A:N	3.4	4.9	[email protected]
Access Vector: Local Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: None
6.3	MEDIUM	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N	1.0	5.2	[email protected]
Attack Vector: Local Attack Complexity: High Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: None

CWE ids for CVE-2020-28049

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

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Assigned by: [email protected] (Primary)

References for CVE-2020-28049

https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog

Release Notes;Third Party Advisory
https://www.debian.org/security/2020/dsa-4783

Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html

Mailing List;Third Party Advisory
https://github.com/sddm/sddm/releases

Release Notes;Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049

Exploit;Issue Tracking;Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html

Mailing List;Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/

Third Party Advisory

Products affected by CVE-2020-28049

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Opensuse » Leap » Version: 15.1
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
Matching versions
Opensuse » Leap » Version: 15.2
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Matching versions
Sddm Project » Sddm
Versions before (<) 0.19.0
cpe:2.3:a:sddm_project:sddm:*:*:*:*:*:*:*:*
Matching versions