USN-3430-3: Dnsmasq regression

4 January 2018

dnsmasq regression

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

  • Ubuntu 12.04 ESM

Summary

USN-3430-2 introduced regression in Dnsmasq.

Software Description

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

Details

USN-3430-2 fixed several vulnerabilities. The update introduced a new regression that breaks DNS resolution. This update addresses the problem.

We apologize for the inconvenience.

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 - 2.59-4ubuntu0.4
dnsmasq-base - 2.59-4ubuntu0.4
dnsmasq-utils - 2.59-4ubuntu0.4

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