========================================================================== Ubuntu Security Notice USN-3430-2 October 03, 2017 dnsmasq vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM Summary: Several security issues were fixed in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: USN-3430-1 fixed several vulnerabilities in Dnsmasq. This update provides the corresponding update for Ubuntu 12.04 ESM. Original advisory details: A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled DNS requests. A remote A attacker could use this issue to cause Dnsmasq to crash, resulting in A a denial of service, or possibly execute arbitrary code.A A (CVE-2017-14491) A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled IPv6 router A advertisements. A remote attacker could use this issue to cause A Dnsmasq to crash, resulting in a denial of service, or possibly A execute arbitrary code. (CVE-2017-14492) A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled DHCPv6 requests. A remote A attacker could use this issue to cause Dnsmasq to crash, resulting in A a denial of service, or possibly execute arbitrary code.A A (CVE-2017-14493) A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled DHCPv6 packets. A remote A attacker could use this issue to possibly obtain sensitive memory A contents. (CVE-2017-14494) A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled DNS requests. A remote A attacker could use this issue to cause Dnsmasq to consume memory, A resulting in a denial of service. (CVE-2017-14495) A Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher A discovered that Dnsmasq incorrectly handled DNS requests. A remote A attacker could use this issue to cause Dnsmasq to crash, resulting in A a denial of service. (CVE-2017-14496) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: A dnsmasqA A A A A A A A A A A A A A A A A A A A A A A A A 2.59-4ubuntu0.3 A dnsmasq-baseA A A A A A A A A A A A A A A A A A A A 2.59-4ubuntu0.3 A dnsmasq-utilsA A A A A A A A A A A A A A A A A A A 2.59-4ubuntu0.3 After a standard system update you need to reboot your computer to make all the necessary changes. References: A https://www.ubuntu.com/usn/usn-3430-2 A https://www.ubuntu.com/usn/usn-3430-1 A CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494, A CVE-2017-14495, CVE-2017-14496