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AUSCERT External Security Bulletin Redistribution
ESB-2023.3939
USN-6225-1: Knot Resolver vulnerability
13 July 2023
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AusCERT Security Bulletin Summary
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Product: Knot Resolver
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2022-40188
Original Bulletin:
https://ubuntu.com/security/notices/USN-6225-1
Comment: CVSS (Max): 7.5 CVE-2022-40188 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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USN-6225-1: Knot Resolver vulnerability
13 July 2023
Knot Resolver could be made to crash if it received specially crafted network
traffic.
Releases
o Ubuntu 22.10
o Ubuntu 22.04 LTS
o Ubuntu 20.04 LTS
o Ubuntu 18.04 ESM
o Ubuntu 16.04 ESM
Packages
o knot-resolver – caching, DNSSEC-validating DNS resolver
Details
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.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 22.10
o knot-resolver – 5.5.1-5ubuntu0.22.10.1
Ubuntu 22.04
o knot-resolver – 5.4.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
Ubuntu 20.04
o knot-resolver – 3.2.1-3ubuntu2.1
Ubuntu 18.04
o knot-resolver – 2.1.1-1ubuntu0.1~esm2
Available with Ubuntu Pro
o libkres6 – 2.1.1-1ubuntu0.1~esm2
Available with Ubuntu Pro
o libkres-dev – 2.1.1-1ubuntu0.1~esm2
Available with Ubuntu Pro
Ubuntu 16.04
o knot-resolver – 1.0.0~beta3-1ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References
o CVE-2022-40188
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