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CVE-2021-3448

Date: April 8, 2021

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.

Language: C

Severity Score

Related Resources (17)

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
https://access.redhat.com/security/cve/CVE-2021-3448
https://security.gentoo.org/glsa/202105-20
https://security.archlinux.org/CVE-2021-3448
https://bugzilla.redhat.com/show_bug.cgi?id=1939368
https://www.oracle.com/security-alerts/cpujan2022.html
https://nvd.nist.gov/vuln/detail/CVE-2021-3448
https://security-tracker.debian.org/tracker/CVE-2021-3448
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3448
https://security.alpinelinux.org/vuln/CVE-2021-3448
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
https://www.mend.io/vulnerability-database/CVE-2021-3448

Severity Score

Weakness Type (CWE)

Improperly Implemented Security Check for Standard

CWE-358

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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