SB2019022814 - Arch Linux update for gdm

Description

This security bulletin contains information about 2 vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2019-3820)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a physical attacker to bypass security restrictions on the system.

The vulnerability exists due to the lock screen feature does not properly restrict all contextual actions. A physical attacker can click on the password text field to bypass the lock screen and re-enable certain keyboard shortcuts, which the attacker can use to perform unauthorized actions on the system.

2) Security restrictions bypass (CVE-ID: CVE-2019-3825)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: 2.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a physical attacker to bypass security restrictions on the system.

The vulnerability exists due to improper security restrictions imposed by the affected software when timed login is enabled. A local attacker with physical access can select the timed login user and wait for the timer to expire that allows to bypass security restrictions and gain access to the logged-in user’s session on the targeted system.

Remediation

Install update from vendor's website.

References

• https://security.archlinux.org/advisory/ASA-201902-29