What is the vulnerability ID for this security advisory?

The vulnerability ID for this security advisory is USN-6225-1.

What is the severity of the vulnerability mentioned in this security advisory?

The severity of the vulnerability mentioned in this security advisory is not specified.

Which software is affected by this vulnerability?

The affected software is Knot Resolver.

How does this vulnerability impact the affected software?

This vulnerability allows a remote attacker to send requests to malicious domains and cause a denial of service.

How can I fix this vulnerability?

To fix this vulnerability, you should update Knot Resolver to version 5.5.1-5ubuntu0.22.10.1 (for Ubuntu 22.10), 5.4.4-1ubuntu0.1~esm1 (for Ubuntu 22.04), 3.2.1-3ubuntu2.1 (for Ubuntu 20.04), 2.1.1-1ubuntu0.1~esm2 (for Ubuntu 18.04), or 1.0.0~beta3-1ubuntu0.1~esm1 (for Ubuntu 16.04).

Vulnerability/
USN-6225-1

13/7/2023

USN-6225-1: Knot Resolver vulnerability

First published: Thu Jul 13 2023(Updated: )

It was discovered that Knot Resolver did not correctly handle certain client options. A remote attacker could send requests to malicous domains and cause a denial of service.

Affected Software	Affected Version	How to fix
All of
ubuntu/knot-resolver	<5.5.1-5ubuntu0.22.10.1	5.5.1-5ubuntu0.22.10.1
	=22.10
All of
ubuntu/knot-resolver	<5.4.4-1ubuntu0.1~esm1	5.4.4-1ubuntu0.1~esm1
	=22.04
All of
ubuntu/knot-resolver	<3.2.1-3ubuntu2.1	3.2.1-3ubuntu2.1
	=20.04
All of
ubuntu/knot-resolver	<2.1.1-1ubuntu0.1~esm2	2.1.1-1ubuntu0.1~esm2
	=18.04
All of
ubuntu/libkres6	<2.1.1-1ubuntu0.1~esm2	2.1.1-1ubuntu0.1~esm2
	=18.04
All of
ubuntu/libkres-dev	<2.1.1-1ubuntu0.1~esm2	2.1.1-1ubuntu0.1~esm2
	=18.04
All of
ubuntu/knot-resolver	<1.0.0~beta3-1ubuntu0.1~esm1	1.0.0~beta3-1ubuntu0.1~esm1
	=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

CVE-2022-40188

Frequently Asked Questions

What is the vulnerability ID for this security advisory?
The vulnerability ID for this security advisory is USN-6225-1.
What is the severity of the vulnerability mentioned in this security advisory?
The severity of the vulnerability mentioned in this security advisory is not specified.
Which software is affected by this vulnerability?
The affected software is Knot Resolver.
How does this vulnerability impact the affected software?
This vulnerability allows a remote attacker to send requests to malicious domains and cause a denial of service.
How can I fix this vulnerability?
To fix this vulnerability, you should update Knot Resolver to version 5.5.1-5ubuntu0.22.10.1 (for Ubuntu 22.10), 5.4.4-1ubuntu0.1~esm1 (for Ubuntu 22.04), 3.2.1-3ubuntu2.1 (for Ubuntu 20.04), 2.1.1-1ubuntu0.1~esm2 (for Ubuntu 18.04), or 1.0.0~beta3-1ubuntu0.1~esm1 (for Ubuntu 16.04).

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source/Ubuntu
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version/ubuntu ubuntu/20.04
version/ubuntu ubuntu/18.04
version/ubuntu ubuntu/16.04

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