CVE-2019-3825
published 2019-02-06CVE-2019-3825: 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…
PriorityP426medium6.4CVSS 3.0
AVPACHPRNUINSUCHIHAH
EPSS
0.50%
39.3th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | gdm3 | < gdm3 3.30.2-3 (bookworm) | gdm3 3.30.2-3 (bookworm) |
| gnome | gnome_display_manager | < 3.31.4 | 3.31.4 |
| redhat | enterprise_linux | — | — |
| the_gnome_projectr | gdm | — | — |
CVSS provenance
nvdv3.06.4MEDIUMCVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.06.9MEDIUMAV:L/AC:M/Au:N/C:C/I:C/A:C
osv6.4MEDIUM
vendor_debian6.3LOW
vendor_redhat6.3MEDIUM
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GHSA
GHSA-pfhm-wwqj-c296: A vulnerability was discovered in gdm before 3
ghsa_unreviewed·2022-05-13
CVE-2019-3825 [MEDIUM] CWE-287 GHSA-pfhm-wwqj-c296: A vulnerability was discovered in gdm before 3
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.
OSV
CVE-2019-3825: A vulnerability was discovered in gdm before 3
osv·2019-02-06·CVSS 6.4
CVE-2019-3825 [MEDIUM] CVE-2019-3825: A vulnerability was discovered in gdm before 3
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.
Ubuntu
GDM vulnerability
vendor_ubuntu·2019-02-20
CVE-2019-3825 GDM vulnerability
Title: GDM vulnerability
Summary: GDM could give unauthorized access to a different user.
Burghard Britzke discovered that GDM incorrectly handled certain configurations.
An attacker could possibly use this issue to get unauthorized access to
a different user.
Instructions: After a standard system update you need to reboot your computer to make
all the necessary changes.
Red Hat
gdm: lock screen bypass when timed login is enabled
vendor_redhat·2019-02-06·CVSS 6.3
CVE-2019-3825 [MEDIUM] CWE-287 gdm: lock screen bypass when timed login is enabled
gdm: lock screen bypass when timed login is enabled
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.
A vulnerability was discovered in gdm 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.
Mitigation: Ensure timed login is not enabled in gdm configuration, by checking the output of:
~~~
grep TimedLogin /etc/gdm/custom.conf
~~~
Package: gdm (Red Hat Enterprise Linux 6) - Will not fix
Debian
CVE-2019-3825: gdm3 - A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled...
vendor_debian·2019·CVSS 6.3
CVE-2019-3825 [MEDIUM] CVE-2019-3825: gdm3 - A vulnerability was discovered in gdm before 3.31.4. When timed login is enabled...
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.
Scope: local
bookworm: resolved (fixed in 3.30.2-3)
bullseye: resolved (fixed in 3.30.2-3)
forky: resolved (fixed in 3.30.2-3)
sid: resolved (fixed in 3.30.2-3)
trixie: resolved (fixed in 3.30.2-3)
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2019-3825 gdm: lock screen bypass when timed login is enabled [fedora-all]
bugzilla·2019-02-06·CVSS 6.3
CVE-2019-3825 [MEDIUM] CVE-2019-3825 gdm: lock screen bypass when timed login is enabled [fedora-all]
CVE-2019-3825 gdm: lock screen bypass when timed login is enabled [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple supported version
Bugzilla
CVE-2019-3825 gdm: lock screen bypass when timed login is enabled
bugzilla·2019-02-06·CVSS 6.3
CVE-2019-3825 [MEDIUM] CVE-2019-3825 gdm: lock screen bypass when timed login is enabled
CVE-2019-3825 gdm: lock screen bypass when timed login is enabled
Under the right circumstances, after the timed login timeout expires, a running session may get misassociated with the timed login user instead of the user that started the session. Further attempts to log in as the timed login user will instead unlock the misassociated user session.
This only affects X.org since, gdm kills the login screen on wayland after login.
Timed logins must be enabled to expose this vulnerability.
Upstream issue:
https://gitlab.gnome.org/GNOME/gdm/issues/460
Discussion:
Acknowledgments:
Name: the GNOME Project
Upstream: Burghard Britzke
---
Mitigation:
Ensure timed login is not enabled in gdm configuration, by checking the output of:
~~~
grep TimedLogin /etc/gdm/custom.conf
~~~
---
Crea
2019-02-06
Published