Arch Linux Security Advisory ASA-201910-6
========================================
Severity: High
Date    : 2019-10-11
CVE-ID  : CVE-2019-16866
Package : unbound
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1042

Summary
======
The package unbound before version 1.9.4-1 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 1.9.4-1.

# pacman -Syu "unbound>=1.9.4-1"

The problem has been fixed upstream in version 1.9.4.

Workaround
=========
None.

Description
==========
Due to an error in parsing NOTIFY queries, it is possible for Unbound
from 1.7.1 up to and including 1.9.3 to continue processing malformed
queries and may ultimately result in a pointer dereference in
uninitialized memory. This results in a crash of the Unbound daemon.

Impact
=====
A remote attacker might be able to crash the Unbound server via crafted
NOTIFY queries.

References
=========
https://www.nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt
https://github.com/NLnetLabs/unbound/commit/b60c4a472c856f0a98120b7259e991b3a6507eb5
https://security.archlinux.org/CVE-2019-16866