==========================================================================
Ubuntu Security Notice USN-3430-3
January 04, 2018
dnsmasq regression
==========================================================================
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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