USN-3430-1: Dnsmasq vulnerabilities

Ubuntu Security Notice USN-3430-1

2nd October, 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 version:

Ubuntu 17.04:

dnsmasq 2.76-5ubuntu0.1

dnsmasq-utils 2.76-5ubuntu0.1

dnsmasq-base 2.76-5ubuntu0.1

Ubuntu 16.04 LTS:

dnsmasq 2.75-1ubuntu0.16.04.3

dnsmasq-utils 2.75-1ubuntu0.16.04.3

dnsmasq-base 2.75-1ubuntu0.16.04.3

Ubuntu 14.04 LTS:

dnsmasq 2.68-1ubuntu0.2

dnsmasq-utils 2.68-1ubuntu0.2

dnsmasq-base 2.68-1ubuntu0.2

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494, CVE-2017-14495, CVE-2017-14496

from Ubuntu Security Notices http://ift.tt/2g58Hbo