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Ubuntu Security Notice USN-3430-3
January 04, 2018

dnsmasq regression
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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

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

References:
  https://www.ubuntu.com/usn/usn-3430-3
  https://www.ubuntu.com/usn/usn-3430-1
  https://launchpad.net/bugs/1741262
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