=========================================================================Ubuntu Security Notice USN-4764-1
March 15, 2021

glib2.0 vulnerability
=========================================================================
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:

GLib could be made to create files if it opened a specially crafted
archive.

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

Details:

It was discovered that GLib incorrectly handled certain symlinks when
replacing files. If a user or automated system were tricked into extracting
a specially crafted file with File Roller, a remote attacker could possibly
create files outside of the intended directory.

Update instructions:

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

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

Ubuntu 20.04 LTS:
  libglib2.0-0                    2.64.6-1~ubuntu20.04.3

Ubuntu 18.04 LTS:
  libglib2.0-0                    2.56.4-0ubuntu0.18.04.8

Ubuntu 16.04 LTS:
  libglib2.0-0                    2.48.2-0ubuntu4.8

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4764-1
  CVE-2021-28153

Package Information:
  https://launchpad.net/ubuntu/+source/glib2.0/2.66.1-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/glib2.0/2.64.6-1~ubuntu20.04.3
  https://launchpad.net/ubuntu/+source/glib2.0/2.56.4-0ubuntu0.18.04.8
  https://launchpad.net/ubuntu/+source/glib2.0/2.48.2-0ubuntu4.8