Subject: [ASA-201801-32] dnsmasq: insufficient validation

Arch Linux Security Advisory ASA-201801-32
==========================================

Severity: Medium
Date    : 2018-01-30
CVE-ID  : CVE-2017-15107
Package : dnsmasq
Type    : insufficient validation
Remote  : Yes
Link    : https://security.archlinux.org/AVG-592

Summary
=======

The package dnsmasq before version 2.78-2 is vulnerable to insufficient
validation.

Resolution
==========

Upgrade to 2.78-2.

# pacman -Syu "dnsmasq>=2.78-2"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

Description
===========

A vulnerability was found in Dnsmasq's implementation of DNSSEC before
2.79. Wildcard synthesized NSEC records could be improperly interpreted
to prove the non-existence of hostnames that actually exist.

Impact
======

A remote attacker may be able to prove the non-existence of hostnames
that actually exist by using wildcard synthesized NSEC records that
could be improperly interpreted,

References
==========

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=4fe6744a220eddd3f1749b40cac3dfc510787de6
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2018q1/011896.html
https://security.archlinux.org/CVE-2017-15107