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archlinuxArchLinuxASA-201903-3
HistoryMar 03, 2019 - 12:00 a.m.

[ASA-201903-3] gdm: access restriction bypass

2019-03-0300:00:00
security.archlinux.org
26

6.4 Medium

CVSS3

Attack Vector

PHYSICAL

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

43.3%

Arch Linux Security Advisory ASA-201903-3

Severity: High
Date : 2019-03-03
CVE-ID : CVE-2019-3820 CVE-2019-3825
Package : gdm
Type : access restriction bypass
Remote : No
Link : https://security.archlinux.org/AVG-879

Summary

The package gdm before version 3.30.3-1 is vulnerable to access
restriction bypass.

Resolution

Upgrade to 3.30.3-1.

pacman -Syu “gdm>=3.30.3-1”

The problems have been fixed upstream in version 3.30.3.

Workaround

None.

Description

  • CVE-2019-3820 (access restriction bypass)

A partial screen lock bypass via keybindings has been found in gdm <=
3.30.2, allowing a local attacker to unlock a session under certain
circumstances.

  • CVE-2019-3825 (access restriction bypass)

An issue has been found in gdm <= 3.30.2, allowing a local attacker
with valid credentials to unlock the session for a different user than
their own.

Impact

A local attacker can unlock session if they have other valid
credentials, or under certain circumstances.

References

https://gitlab.gnome.org/GNOME/gnome-shell/issues/851
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3825
https://gitlab.gnome.org/GNOME/gdm/issues/460
https://security.archlinux.org/CVE-2019-3820
https://security.archlinux.org/CVE-2019-3825

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanygdm< 3.30.3-1UNKNOWN

6.4 Medium

CVSS3

Attack Vector

PHYSICAL

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

43.3%