=========================================================================Ubuntu Security Notice USN-4759-1
March 08, 2021

glib2.0 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in GLib.

Software Description:
- glib2.0: GLib library of C routines

Details:

Krzesimir Nowak discovered that GLib incorrectly handled certain large
buffers. A remote attacker could use this issue to cause applications
linked to GLib to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2021-27218)

Kevin Backhouse discovered that GLib incorrectly handled certain memory
allocations. A remote attacker could use this issue to cause applications
linked to GLib to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2021-27219)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  libglib2.0-0                    2.66.1-2ubuntu0.1

Ubuntu 20.04 LTS:
  libglib2.0-0                    2.64.6-1~ubuntu20.04.2

Ubuntu 18.04 LTS:
  libglib2.0-0                    2.56.4-0ubuntu0.18.04.7

Ubuntu 16.04 LTS:
  libglib2.0-0                    2.48.2-0ubuntu4.7

After a standard system update you need to restart your session to make all
the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4759-1
  CVE-2021-27218, CVE-2021-27219

Package Information:
  https://launchpad.net/ubuntu/+source/glib2.0/2.66.1-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/glib2.0/2.64.6-1~ubuntu20.04.2
  https://launchpad.net/ubuntu/+source/glib2.0/2.56.4-0ubuntu0.18.04.7
  https://launchpad.net/ubuntu/+source/glib2.0/2.48.2-0ubuntu4.7