========================================================================== Ubuntu Security Notice USN-3758-1 August 30, 2018 libx11 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Several security issues were fixed in libx11. Software Description: - libx11: X11 client-side library Details: Tobias Stoeckmann discovered that libx11 incorrectly handled certain images. An attacker could possibly use this issue to access sensitive information (CVE-2016-7942) Tobias Stoeckmann discovered that libx11 incorrectly handled certain inputs. An attacker could possibly use this issue to access sensitive information. (CVE-2016-7943) It was discovered that libx11 incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-14598, CVE-2018-14599, CVE-2018-14600) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: libx11-6 2:1.6.4-3ubuntu0.1 libx11-dev 2:1.6.4-3ubuntu0.1 Ubuntu 16.04 LTS: libx11-6 2:1.6.3-1ubuntu2.1 libx11-dev 2:1.6.3-1ubuntu2.1 Ubuntu 14.04 LTS: libx11-6 2:1.6.2-1ubuntu2.1 libx11-dev 2:1.6.2-1ubuntu2.1 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://usn.ubuntu.com/usn/usn-3758-1 CVE-2016-7942, CVE-2016-7943, CVE-2018-14598, CVE-2018-14599, CVE-2018-14600 Package Information: https://launchpad.net/ubuntu/+source/libx11/2:1.6.4-3ubuntu0.1 https://launchpad.net/ubuntu/+source/libx11/2:1.6.3-1ubuntu2.1 https://launchpad.net/ubuntu/+source/libx11/2:1.6.2-1ubuntu2.1