PT-2020-5744 · Sddm+2 · Sddm+2

Fabian Vogt · Published 2020-10-01 · Updated 2024-10-23 · CVE-2020-28049

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions: SDDM versions prior to 0.19.0

Description: The issue is related to the incorrect start of the X server by SDDM, allowing local unprivileged users to create a connection to the X server without proper authentication for a short time period. This is caused by a race condition during Xauthority file creation, which can allow a local attacker to access X server display contents, intercept keystrokes, or access the clipboard.

Recommendations: For SDDM versions prior to 0.19.0, update to version 0.19.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the X server to minimize the risk of exploitation. Avoid using SDDM until the issue is resolved. At the moment, there is information about a newer version that contains a fix for this vulnerability, which is SDDM 0.19.0.

Exploit

Fix

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

ALT-PU-2020-3209

ALT-PU-2020-3250

ALT-PU-2021-1734

ALT-PU-2024-14448

BDU:2021-01700

CVE-2020-28049

DLA-2436-1

DSA-4783-1

MGASA-2020-0412

OPENSUSE-SU-2020:1870-1

OPENSUSE-SU-2020:1899-1

OPENSUSE-SU-2020_1870-1

OPENSUSE-SU-2024:11376-1

Affected Products

Alt Linux

Sddm

Suse

References · 41

• 🔥 https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049 · Exploit
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S · Vendor Advisory
• https://security.gentoo.org/glsa/202402-02 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2020:1899-1 · Vendor Advisory
• https://debian.org/security/2020/dsa-4783 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2436-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-28049 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-28049 · Security Note
• https://osv.dev/vulnerability/MGASA-2020-0412 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-28049 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-28049 · Security Note
• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11376-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-28049 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-4783-1 · Vendor Advisory