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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. 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.
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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. Full Vigil@nce bulletin... (Free trial)
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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