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GLSA-202105-20 : Dnsmasq: DNS cache poisoning

medium Nessus Plugin ID 156978

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Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-202105-20 (Dnsmasq: DNS cache poisoning)

 It was discovered that Dnsmasq, when configured with
 --server=<address>@ or similar (e.g. through dbus), configured a fixed UDP port for all outgoing queries to the specified upstream DNS server.
 Impact :

 An attacker, by sending malicious crafted DNS responses, could perform a DNS Cache Poisoning attack.
 Workaround :

 There is no known workaround at this time.

Solution

All Dnsmasq users should upgrade to the latest version:
 # emerge --sync # emerge --ask --oneshot --verbose '>=net-dns/dnsmasq-2.85'

See Also

https://security.gentoo.org/glsa/202105-20

Plugin Details

Severity: Medium

ID: 156978

File Name: gentoo_GLSA-202105-20.nasl

Version: 1.4

Type: local

Published: 1/24/2022

Updated: 12/21/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

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

CVSS Score Source: CVE-2021-3448

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.6

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

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

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:dnsmasq, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/26/2021

Vulnerability Publication Date: 4/8/2021

Reference Information

CVE: CVE-2021-3448

GLSA: 202105-20