Vulnerability of Unbound: denial of service via NOTIFY

Synthesis of the vulnerability

An attacker can send malicious NOTIFY packets to Unbound, in order to trigger a denial of service.

Impacted systems: Debian, OpenBSD, Ubuntu.

Severity of this alert: 2/4.

Creation date: 04/10/2019.

Revision date: 08/10/2019.

Références of this alert: CVE-2019-16866, DSA-4544-1, USN-4149-1, VIGILANCE-VUL-30527.

Description of the vulnerability

The Unbound product has a service to manage received NOTIFY packets.

However, when malicious NOTIFY packets are received, a fatal error occurs.

An attacker can therefore send malicious NOTIFY packets to Unbound, in order to trigger a denial of service.
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This computer vulnerability alert impacts software or systems such as Debian, OpenBSD, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat alert is medium.

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

An attacker with a expert ability can exploit this security vulnerability.

Solutions for this threat

Unbound: version 1.9.4.
The version 1.9.4 is fixed:
https://www.nlnetlabs.nl/downloads/unbound/unbound-1.9.4.tar.gz

Unbound: patch for NOTIFY.
A patch is available:
https://www.nlnetlabs.nl/downloads/unbound/patch_cve_2019-16866.diff

Debian 10: new unbound packages.
New packages are available:
Debian 10: unbound 1.9.0-2+deb10u1

OpenBSD: patch for unwind/unbound.
A patch is available:
https://www.openbsd.org/errata64.html
https://www.openbsd.org/errata65.html

Ubuntu 19.04: new unbound packages.
New packages are available:
Ubuntu 19.04: unbound 1.9.0-2ubuntu0.1
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