Race Condition Affecting gdm3 package, versions <3.38.2.1-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.23% (14th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-GDM3-1053630
  • published22 Dec 2020
  • disclosed28 Dec 2020

Introduced: 22 Dec 2020

CVE-2020-27837  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Debian:unstable gdm3 to version 3.38.2.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gdm3 package and not the gdm3 package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.

CVSS Base Scores

version 3.1