CVE-2021-3448

medium

Description

A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1939368

https://lists.fedoraproject.org/archives/list/[email protected]/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/

https://lists.fedoraproject.org/archives/list/[email protected]/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/

https://lists.fedoraproject.org/archives/list/[email protected]/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/

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

https://www.oracle.com/security-alerts/cpujan2022.html

Details

Source: MITRE

Published: 2021-04-08

Updated: 2022-03-01

Type: CWE-358

Risk Information

CVSS v2

Base Score: 4.3

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

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 4

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Impact Score: 1.4

Exploitability Score: 2.2

Severity: MEDIUM