========================================================================== Ubuntu Security Notice USN-3430-1 October 02, 2017 dnsmasq vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 17.04 - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Several security issues were fixed in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-14491) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled IPv6 router advertisements. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-14492) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DHCPv6 requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-14493) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DHCPv6 packets. A remote attacker could use this issue to possibly obtain sensitive memory contents. (CVE-2017-14494) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. A remote attacker could use this issue to cause Dnsmasq to consume memory, resulting in a denial of service. (CVE-2017-14495) Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher discovered that Dnsmasq incorrectly handled DNS requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service. (CVE-2017-14496) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 17.04: dnsmasq 2.76-5ubuntu0.1 dnsmasq-base 2.76-5ubuntu0.1 dnsmasq-utils 2.76-5ubuntu0.1 Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.3 dnsmasq-base 2.75-1ubuntu0.16.04.3 dnsmasq-utils 2.75-1ubuntu0.16.04.3 Ubuntu 14.04 LTS: dnsmasq 2.68-1ubuntu0.2 dnsmasq-base 2.68-1ubuntu0.2 dnsmasq-utils 2.68-1ubuntu0.2 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://www.ubuntu.com/usn/usn-3430-1 CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494, CVE-2017-14495, CVE-2017-14496 Package Information: https://launchpad.net/ubuntu/+source/dnsmasq/2.76-5ubuntu0.1 https://launchpad.net/ubuntu/+source/dnsmasq/2.75-1ubuntu0.16.04.3 https://launchpad.net/ubuntu/+source/dnsmasq/2.68-1ubuntu0.2