A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
WebKitGTK+ could be made to expose sensitive information.
- webkit2gtk: Web content engine library for GTK+
It was discovered that speculative execution performed by modern CPUs
could leak information through a timing side-channel attack, and that
tricked in to opening a specially crafted website, an attacker could
potentially exploit this to obtain sensitive information from other
domains, bypassing same-origin restrictions. (CVE-2017-5753, CVE-2017-5715)
The problem can be corrected by updating your system to the following
This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use WebKitGTK+, such as Epiphany, to make all the necessary changes.