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