There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-
    controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS
    records. (CVE-2020-12667)

- fixes CVE-2020-12667

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3795 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3795-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     April 26, 2024                                https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : knot-resolver     Version        : 3.2.1-3+deb10u2     CVE ID         : CVE-2019-10190 CVE-2019-10191 CVE-2019-19331 CVE-2020-12667     Debian Bug     : 932048 946181 961076

    Several security vulnerabilities have been discovered in knot-resolver, a     caching, DNSSEC-validating DNS resolver which may allow remote attackers to     bypass DNSSEC validation or cause a denial-of-service.

    For Debian 10 buster, these problems have been fixed in version     3.2.1-3+deb10u2.

    We recommend that you upgrade your knot-resolver packages.

    For the detailed security status of knot-resolver please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/knot-resolver

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

update to upstream version 5.1.3

----

  - update to new upstream version

----

  - fixes CVE-2020-12667

----

new upstream release https://www.knot-resolver.cz/2020-04-29-knot-resolver-5.1.0.html

----

  - bugfix for 5.0.0 release

----

  - see     https://knot-resolver.readthedocs.io/en/stable/upgrading     .html

  - version 5.0 no longer support network interface     configuration via systemd sockets and manual upgrade of     configuration file is required for upgrades

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7047-1 advisory.

    Vladimr unt discovered that Knot Resolver incorrectly handled input during DNSSEC validation. A     remote attacker could possibly use this issue to bypass certain validations. (CVE-2019-10190)

    Vladimr unt discovered that Knot Resolver incorrectly handled input during DNSSEC validation. A     remote attacker could possibly use this issue to downgrade DNSSEC-secure domains to a DNSSEC-insecure     state, resulting

    in a domain hijacking attack. (CVE-2019-10191)

    Vladimr unt discovered that Knot Resolver incorrectly handled certain

    DNS replies with many resource records. An attacker could possibly use

    this issue to consume system resources, resulting in a denial of service. (CVE-2019-19331)

    Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Knot Resolver incorrectly handled certain     queries. A remote attacker could

    use this issue to perform an amplification attack directed at a target. (CVE-2020-12667)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-     controlled server, aka an NXNSAttack issue. This is triggered by random subdomains in the NSDNAME in NS     records. (CVE-2020-12667)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
405082	Alpine: multiple knot-resolver packages: security update to 4.3.0-r3	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
405083	Alpine: multiple knot-resolver packages: security update to 5.1.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
405082	Alpine: multiple knot-resolver packages: security update to 4.3.0-r3	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
405083	Alpine: multiple knot-resolver packages: security update to 5.1.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	high
137120	Fedora 32 : knot-resolver (2020-bf68101ad3)	Nessus	Fedora Local Security Checks	6/4/2020	3/7/2024	high
193916	Debian dla-3795 : knot-resolver - security update	Nessus	Debian Local Security Checks	4/26/2024	1/22/2025	high
140671	Fedora 31 : knot-resolver (2020-52e28feab6)	Nessus	Fedora Local Security Checks	9/21/2020	2/20/2024	high
207977	Ubuntu 20.04 LTS : Knot Resolver vulnerabilities (USN-7047-1)	Nessus	Ubuntu Local Security Checks	10/1/2024	10/1/2024	high
250755	Linux Distros Unpatched Vulnerability : CVE-2020-12667	Nessus	Misc.	8/18/2025	7/24/2026	high

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