ESB-2017.2474 - [Ubuntu] dnsmasq: Multiple vulnerabilities 2017-10-03

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2474
                          Dnsmasq vulnerabilities
                              3 October 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           dnsmasq
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-14496 CVE-2017-14495 CVE-2017-14494
                   CVE-2017-14493 CVE-2017-14492 CVE-2017-14491

Reference:         ESB-2017.2473
                   ESB-2017.2471
                   ESB-2017.2470

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3430-1

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==========================================================================
Ubuntu Security Notice USN-3430-1
October 02, 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 versions:

Ubuntu 17.04:
  dnsmasq                         2.76-5ubuntu0.1
  dnsmasq-base                    2.76-5ubuntu0.1
  dnsmasq-utils                   2.76-5ubuntu0.1

Ubuntu 16.04 LTS:
  dnsmasq                         2.75-1ubuntu0.16.04.3
  dnsmasq-base                    2.75-1ubuntu0.16.04.3
  dnsmasq-utils                   2.75-1ubuntu0.16.04.3

Ubuntu 14.04 LTS:
  dnsmasq                         2.68-1ubuntu0.2
  dnsmasq-base                    2.68-1ubuntu0.2
  dnsmasq-utils                   2.68-1ubuntu0.2

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

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

Package Information:
  https://launchpad.net/ubuntu/+source/dnsmasq/2.76-5ubuntu0.1
  https://launchpad.net/ubuntu/+source/dnsmasq/2.75-1ubuntu0.16.04.3
  https://launchpad.net/ubuntu/+source/dnsmasq/2.68-1ubuntu0.2

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