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Ubuntu Security Notice USN-3430-1

Ubuntu Security Notice USN-3430-1
Posted Oct 2, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3430-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494, CVE-2017-14495, CVE-2017-14496
MD5 | 8d00c140a9e7867ed8bd2d24d3864259

Ubuntu Security Notice USN-3430-1

Change Mirror Download
==========================================================================
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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