SECURITY

USN-3285-1: LightDM vulnerability Ubuntu Security Notice USN-3285-1 11th May, 2017 lightdm vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Ubuntu 16.10 Summary LightDM could allow unintended access to files. Software description lightdm – Display Manager Details Tyler Hicks discovered that LightDM did not confine the user session for guestusers. An attacker with physical access could use this issue to access filesand other resources that they should not be able to access. In the defaultinstallation, this includes files in the home directories of other users on thesystem. This update fixes the issue by disabling the guest session. It may bere-enabled in a future update. Please see the bug referenced below forinstructions on how to manually re-enable the guest session. Update instructions The problem can be corrected by updating your system to the following package version: [ more… ]

USN-3260-2: Firefox regression Ubuntu Security Notice USN-3260-2 11th May, 2017 firefox regression A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 17.04 Ubuntu 16.10 Ubuntu 16.04 LTS Ubuntu 14.04 LTS Summary USN-3260-1 caused a regression in Firefox. Software description firefox – Mozilla Open Source web browser Details USN-3260-1 fixed vulnerabilities in Firefox. The update caused thedate picker panel and form validation errors to close immediately onopening. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to read uninitialized memory, obtain sensitive information, spoof the addressbar contents or other UI elements, escape the sandbox to read local files, conduct cross-site scripting (XSS) attacks, cause a denial of service via [ more… ]