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========================================================================== 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:
 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 12.04 ESM:  dnsmasq                         2.59-4ubuntu0.3  dnsmasq-base                    2.59-4ubuntu0.3  dnsmasq-utils                   2.59-4ubuntu0.3
After a standard system update you need to reboot your computer to make all the necessary changes.
References: Â https://www.ubuntu.com/usn/usn-3430-2 Â https://www.ubuntu.com/usn/usn-3430-1 Â CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494, Â CVE-2017-14495, CVE-2017-14496
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