14 DAY TRIAL // Canonical released some details about an Aptdaemon vulnerability that has been found and corrected in Ubuntu 15.04, Ubuntu 15.04, Ubuntu 14.10, Ubuntu 14.04 LTS and Ubuntu 12.04.
Ubuntu maintainers have been quick to upgrade a package in the distribution in order to fix a problem with aptdaemon, which is the transaction-based package management service. From the looks of it, Aptdaemon could have been made to expose sensitive information, or to allow file access as the administrator.
"Tavis Ormandy discovered that Aptdeamon incorrectly handled the simulate dbus method. A local attacker could use this issue to possibly expose sensitive information, or perform other file access as the root user," reads the security notice.
This is just one of the found and fixed vulnerabilities. For a more detailed description of the problems, you can see Canonical's security notification. Users have been advised to upgrade their systems as soon as possible.
The flaws can be fixed if you upgrade your system to the latest clamav package specific to each distribution. 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, but users will also have to perform a complete reboot.