USN-3430-1: Dnsmasq vulnerabilities
2 October 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
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.