Vulnerability of NLnet Labs Unbound: overload via NXNSAttack On Recursive Resolvers

Synthesis of the vulnerability

An attacker can trigger an overload via NXNSAttack On Recursive Resolvers of NLnet Labs Unbound, in order to trigger a denial of service.

Vulnerable products: Debian, BIG-IP Hardware, TMOS, Fedora, FreeBSD, OpenBSD, openSUSE Leap, pfSense, DNS protocol, RHEL, SLES, Ubuntu.

Severity of this weakness: 3/4.

Creation date: 19/05/2020.

Revision date: 25/05/2020.

Références of this bulletin: CVE-2020-12662, DLA-2556-1, DSA-4694-1, FEDORA-2020-3cfd38fefd, FEDORA-2020-8e9b62948e, FreeBSD-SA-20:19.unbound, K37661551, openSUSE-SU-2020:0912-1, openSUSE-SU-2020:0913-1, RHSA-2020:2414-01, RHSA-2020:2416-01, RHSA-2020:2418-01, RHSA-2020:2419-01, RHSA-2020:2640-01, RHSA-2020:4181-01, SUSE-SU-2020:1772-1, SUSE-SU-2020:1819-1, USN-4374-1, VIGILANCE-VUL-32298.

Description of the vulnerability

An attacker can trigger an overload via NXNSAttack On Recursive Resolvers of NLnet Labs Unbound, in order to trigger a denial of service.
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This computer weakness bulletin impacts software or systems such as Debian, BIG-IP Hardware, TMOS, Fedora, FreeBSD, OpenBSD, openSUSE Leap, pfSense, DNS protocol, RHEL, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer threat announce is important.

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 threat announce.

Solutions for this threat

NLnet Labs Unbound: version 1.10.1.
The version 1.10.1 is fixed:
https://www.nlnetlabs.nl/downloads/unbound/unbound-1.10.1.tar.gz

Debian 10: new unbound packages.
New packages are available:
Debian 10: unbound 1.9.0-2+deb10u2

Debian 9: new unbound1.9 packages.
New packages are available:
Debian 9: unbound1.9 1.9.0-2+deb10u2~deb9u1

Fedora 31-32: new unbound packages.
New packages are available:
Fedora 31: unbound 1.10.1-1.fc31
Fedora 32: unbound 1.10.1-1.fc32

FreeBSD: patch for Unbound.
A patch is available:
  https://security.FreeBSD.org/patches/SA-20:19/unbound.11.3.patch
  https://security.FreeBSD.org/patches/SA-20:19/unbound.11.4.patch
  https://security.FreeBSD.org/patches/SA-20:19/unbound.12.1.patch

OpenBSD: patch for Unbound.
A patch is available:
https://ftp.openbsd.org/pub/OpenBSD/patches/6.6/common/028_unbound.patch.sig
https://ftp.openbsd.org/pub/OpenBSD/patches/6.7/common/005_unbound.patch.sig

openSUSE Leap 15.1: new unbound packages.
New packages are available:
openSUSE Leap 15.1: unbound 1.6.8-lp151.8.3.1

openSUSE Leap 15.2: new unbound packages.
New packages are available:
openSUSE Leap 15.2: unbound 1.6.8-lp152.9.3.1

pfSense: version 2.4.5-p1.
The version 2.4.5-p1 is fixed:
https://www.pfsense.org/download/
https://www.netgate.com/

RHEL 6.10: new unbound packages.
New packages are available:
RHEL 6.10: unbound 1.4.20-29.el6_10.1

RHEL 7.7: new unbound packages.
New packages are available:
RHEL 7.7: unbound 1.6.6-2.el7_7

RHEL 7.8: new unbound packages.
New packages are available:
RHEL 7.8: unbound 1.6.6-4.el7_8

RHEL 8: new unbound packages.
New packages are available:
  RHEL 8.0: unbound 1.7.3-9.el8_0
  RHEL 8.1: unbound 1.7.3-9.el8_1
  RHEL 8.2: unbound 1.7.3-11.el8_2

SUSE LE 15 RTM: new unbound packages.
New packages are available:
SUSE LE 15 RTM: unbound 1.6.8-3.6.1

SUSE LE 15 SP1-2: new unbound packages.
New packages are available:
SUSE LE 15 SP1: unbound 1.6.8-10.3.1
SUSE LE 15 SP2: unbound 1.6.8-10.3.1

Ubuntu: new unbound packages.
New packages are available:
  Ubuntu 20.04 LTS: libunbound8 1.9.4-2ubuntu1.1, unbound 1.9.4-2ubuntu1.1
  Ubuntu 19.10: libunbound8 1.9.0-2ubuntu1.1, unbound 1.9.0-2ubuntu1.1
  Ubuntu 18.04 LTS: libunbound2 1.6.7-1ubuntu2.3, unbound 1.6.7-1ubuntu2.3
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