USN-3430-2: Dnsmasq vulnerabilities

USN-3430-2: Dnsmasq vulnerabilities

Ubuntu Security Notice USN-3430-2

3rd October, 2017

dnsmasq vulnerabilities

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

• Ubuntu 12.04 LTS

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 version:

Ubuntu 12.04 LTS:

dnsmasq

2.59-4ubuntu0.3

dnsmasq-utils

2.59-4ubuntu0.3

dnsmasq-base

2.59-4ubuntu0.3

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

CVE-2017-14491,

CVE-2017-14492,

CVE-2017-14493,

CVE-2017-14494,

CVE-2017-14495,

CVE-2017-14496

Source: USN-3430-2: Dnsmasq vulnerabilities