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Vulnerability · Published Nov 4, 2020 · Assigned by mitre

CVE-2020-28049

Medium 6.3

In plain English

A medium-severity race condition in the sddm package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.4%top 63.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20sddm0.19.0-r0ALPINE-CVE-2020-28049
Alpine:v3.21sddm0.19.0-r0ALPINE-CVE-2020-28049
Alpine:v3.22sddm0.19.0-r0ALPINE-CVE-2020-28049
Alpine:v3.23sddm0.19.0-r0ALPINE-CVE-2020-28049
Alpine:v3.24sddm0.19.0-r0ALPINE-CVE-2020-28049
Debian:12sddm0.19.0-1DEBIAN-CVE-2020-28049
Debian:13sddm0.19.0-1DEBIAN-CVE-2020-28049
Debian:14sddm0.19.0-1DEBIAN-CVE-2020-28049

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

Weakness: CWE-362 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

References