=========================================================================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://ubuntu.com/security/notices/USN-3430-2
https://ubuntu.com/security/notices/USN-3430-1
CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494,
CVE-2017-14495, CVE-2017-14496
