Resource exhaustion in Knot Resolver - CVE-2022-40188

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Main Vulnerability Database Vulnerabilities #VU78292

Resource exhaustion in Knot Resolver - CVE-2022-40188

Published: July 16, 2023


Vulnerability identifier: #VU78292
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2022-40188
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources caused by algorithmic complexity. A malicious authoritative server can return large NS sets or addresses and cause excessive CPU consumption. 


Affected software

Knot Resolver
Fedora
Ubuntu
knot-resolver (Ubuntu package)
libkres6 (Ubuntu package)
libkres-dev (Ubuntu package)
knot-resolver

How to mitigate CVE-2022-40188

Install updates from vendor's website.

Knot Resolver - update to 5.5.3
knot-resolver (Ubuntu package) - addressed in versions Ubuntu Pro, 3.2.1-3ubuntu2.1, 5.5.1-5ubuntu0.22.10.1
libkres6 (Ubuntu package) - update to Ubuntu Pro
libkres-dev (Ubuntu package) - update to Ubuntu Pro
knot-resolver - addressed in versions 5.5.3-1.el7, 5.5.3-1.el8, 5.5.3-1.el9, 5.5.3-1.fc35, 5.5.3-1.fc36, 5.5.3-1.fc37

External References

Related Security Bulletins