14 DAY TRIAL // Numerous Qt vulnerabilities have been identified and fixed in the Ubuntu 15.04, Ubuntu 14.10, Ubuntu 14.04 LTS, and Ubuntu 12.04 LTS operating systems.
The Qt maintainers for Ubuntu have explained that Qt could have been made to crash or run programs as the user's login if it opened a specially crafted file. This is a rather hefty update, and all the supported Ubuntu OSes are affected, so it would be a great idea to upgrade as soon as possible.
"Fabian Vogt discovered that Qt incorrectly handled certain malformed BMP images. If a user or automated system were tricked into opening a specially crafted BMP image, a remote attacker could use this issue to cause Qt to crash, resulting in a denial of service," reads the security notice.
This is just one of the problems identified with the Qt packages. For a more detailed description of the problem, you should check the entire security notification.
The flaws can be fixed if you upgrade your system to the latest libqtgui4 and libqt5gui5 packages. To apply the patch, users will have to run the Update Manager application. In general, a standard system update will make all the necessary changes, and there is no need for a restart.
You can also use the terminal and enter the following commands (you will need to be root in order to make it work):
sudo apt-get dist-upgrade