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Vulnerability of Dnsmasq: denial of service via NSEC

Synthesis of the vulnerability 

An attacker can make Dnsmasq declare that a domain does not exist, because of an error in the signature check step, in order to trigger a denial of service.
Vulnerable systems: Dnsmasq, Fedora, openSUSE Leap, Solaris, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 22/01/2018.
Références of this weakness: bulletinjan2019, CVE-2017-15107, FEDORA-2018-9780220f7d, FEDORA-2018-fbe4017846, openSUSE-SU-2019:2669-1, SUSE-SU-2019:14190-1, SUSE-SU-2019:1721-1, SUSE-SU-2019:3188-1, SUSE-SU-2019:3189-1, USN-4924-1, VIGILANCE-VUL-25130.

Description of the vulnerability 

An attacker can make Dnsmasq declare that a domain does not exist, because of an error in the signature check step, in order to trigger a denial of service.
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This weakness note impacts software or systems such as Dnsmasq, Fedora, openSUSE Leap, Solaris, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this threat note is low.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this computer weakness.

Solutions for this threat 

Dnsmasq: version 2.79.
The version 2.79 is fixed:
  http://www.thekelleys.org.uk/dnsmasq/

Dnsmasq: patch for DNSSEC.
A patch is available:
  http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=patch;h=4fe6744a220eddd3f1749b40cac3dfc510787de6

Fedora: new dnsmasq packages.
New packages are available:
  Fedora 27: dnsmasq 2.78-2.fc27
  Fedora 26: dnsmasq 2.76-6.fc26

openSUSE Leap 15.1: new dnsmasq packages.
New packages are available:
  openSUSE Leap 15.1: dnsmasq 2.78-lp151.5.3.1

Oracle Solaris: patch for third party software of January 2019 v3.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

SUSE LE 11 SP4: new dnsmasq packages.
New packages are available:
  SUSE LE 11 SP4: dnsmasq 2.78-0.17.10.1

SUSE LE 12 SP3/4: new dnsmasq packages.
New packages are available:
  SUSE LE 12 SP3: dnsmasq 2.78-18.6.1
  SUSE LE 12 SP4: dnsmasq 2.78-18.6.1

SUSE LE 15 RTM: new dnsmasq packages.
New packages are available:
  SUSE LE 15 RTM: dnsmasq 2.78-3.8.1

SUSE LE 15 SP1: new dnsmasq packages.
New packages are available:
  SUSE LE 15 SP1: dnsmasq 2.78-7.3.1

Ubuntu 16.04: new dnsmasq packages.
New packages are available:
  Ubuntu 16.04 LTS: dnsmasq 2.75-1ubuntu0.16.04.10

Wind River Linux: version 10.17.41.20.
The version 10.17.41.20 is fixed:
  https://support2.windriver.com/
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