CVE-2019-3825 Auth bypass in gdm

What is CVE-2019-3825?

CVE-2019-3825 is a medium-severity authentication bypass vulnerability in Canonical Ubuntu Linux, published on 6 Feb 2019. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled in configuration, an attacker could bypass the lock screen by selecting the timed login user and waiting for the timer to expire, at which time they would gain access to the logged-in user's session.

Weakness: CWE-287

Which versions are affected by CVE-2019-3825?

It affects 3 products.

Products include Canonical Ubuntu Linux, Gnome Gnome Display Manager, Redhat Enterprise Linux.

How do I fix CVE-2019-3825?

Upgrade to a fixed version.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2019-3825 being exploited?

There is no known exploitation of CVE-2019-3825 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-3825, GHSA-pfhm-wwqj-c296, OESA-2021-1044, SUSE-SU-2019:0527-1, UBUNTU-CVE-2019-3825, USN-3892-1 and 1 more.