USN-3009-1: Dnsmasq vulnerability

Ubuntu Security Notice USN-3009-1

20th June, 2016

dnsmasq vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 16.04 LTS
• Ubuntu 15.10

Summary

Dnsmasq could be made to crash if it received specially crafted network traffic.

Software description

• dnsmasq - Small caching DNS proxy and DHCP/TFTP server

Details

Edwin Török discovered that Dnsmasq incorrectly handled certain CNAME
responses. A remote attacker could use this issue to cause Dnsmasq to
crash, resulting in a denial of service.

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 16.04 LTS:

dnsmasq 2.75-1ubuntu0.16.04.1

dnsmasq-utils 2.75-1ubuntu0.16.04.1

dnsmasq-base 2.75-1ubuntu0.16.04.1

Ubuntu 15.10:

dnsmasq 2.75-1ubuntu0.15.10.1

dnsmasq-utils 2.75-1ubuntu0.15.10.1

dnsmasq-base 2.75-1ubuntu0.15.10.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2015-8899