PT-2023-20562 · Unknown+2 · Knot Resolver+2

Qifan Zhang + 2 · Published 2023-02-21 · Updated 2025-03-14 · CVE-2023-26249

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Knot Resolver versions prior to 5.6.0

Description The issue enables attackers to consume the resolver's resources, launching amplification attacks and potentially causing a denial of service. A single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.

Recommendations For versions prior to 5.6.0, update to version 5.6.0 or later to resolve the issue.

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

ALT-PU-2023-1509

ALT-PU-2024-2060

CVE-2023-26249

Affected Products

Alt Linux

Debian

Knot Resolver

References · 22

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-26249 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32983 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2023-26249 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-26249 · Vendor Advisory
• https://errata.altlinux.org/ALT-PU-2024-2060 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-26249 · Security Note
• https://osv.dev/vulnerability/CVE-2023-26249 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-26249 · Vendor Advisory
• https://knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-04315 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-46317 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-26249 · Vendor Advisory
• https://errata.altlinux.org/ALT-PU-2023-1509 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-26249 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-40188 · Security Note