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AUSCERT External Security Bulletin Redistribution
ESB-2019.0543
GDM vulnerability
21 February 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: gdm
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-3825
Original Bulletin:
http://www.ubuntu.com/usn/usn-3892-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running gdm check for an updated version of the software for their
operating system.
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Ubuntu Security Notice USN-3892-1
February 20, 2019
gdm3 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
Summary:
GDM could give unauthorized access to a different user.
Software Description:
- - gdm3: GNOME Display Manager
Details:
Burghard Britzke discovered that GDM incorrectly handled certain
configurations. An attacker could possibly use this issue to get
unauthorized access to a different user.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.10:
 gdm3                            3.30.1-1ubuntu5.1
Ubuntu 18.04 LTS:
 gdm3                            3.28.3-0ubuntu18.04.4
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
 https://usn.ubuntu.com/usn/usn-3892-1
 CVE-2019-3825
Package Information:
 https://launchpad.net/ubuntu/+source/gdm3/3.30.1-1ubuntu5.1
 https://launchpad.net/ubuntu/+source/gdm3/3.28.3-0ubuntu18.04.4
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