Debian dsa-5633 : knot-resolver - security update

high Nessus Plugin ID 191074

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5633 advisory.

- Knot Resolver before 5.7.0 performs many TCP reconnections upon receiving certain nonsensical responses from servers. (CVE-2023-46317)

- Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the KeyTrap issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records. (CVE-2023-50387)

- The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the NSEC3 issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations. (CVE-2023-50868)

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

Solution

Upgrade the knot-resolver packages.

Plugin Details

Severity: High

ID: 191074

File Name: debian_DSA-5633.nasl

Version: 1.0

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 2/28/2024

Updated: 2/28/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.1

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2023-50387

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:knot-resolver-module-http, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:knot-resolver-doc, p-cpe:/a:debian:debian_linux:knot-resolver

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/27/2024

Vulnerability Publication Date: 10/22/2023

Reference Information

CVE: CVE-2023-46317, CVE-2023-50387, CVE-2023-50868

Detections

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