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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:
  https://www.ubuntu.com/usn/usn-3430-2
  https://www.ubuntu.com/usn/usn-3430-1
  CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494,
  CVE-2017-14495, CVE-2017-14496

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