CVE-2021-3448 — Vulnetix

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CVE-2021-3448 PUBLISHED

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.

EPSS 0.04% · 12.6th percentile

Risk Scores

EPSS Score

0.04%

12.6th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:20.04:LTS	dnsmasq	0, 2.80-1ubuntu2, 2.80-1ubuntu4
Ubuntu:18.04:LTS	dnsmasq	2.79-1ubuntu0.3, 0, 2.78-1
Ubuntu:Pro:16.04:LTS	dnsmasq	2.75-1ubuntu0.16.04.8, 2.75-1ubuntu0.16.04.10, 2.75-1ubuntu0.16.04.10+esm1
Ubuntu:Pro:14.04:LTS	dnsmasq	2.68-1ubuntu0.2, 2.68-1ubuntu0.2+esm2, 2.68-1ubuntu0.2+esm3

Timeline

Apr 8, 2021 CVE Published
Apr 14, 2021 EPSS Score
Apr 27, 2021 EPSS Score
Jun 11, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Oct 24, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Feb 4, 2022 EPSS Score
Feb 8, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 28, 2022 EPSS Score

References

https://ubuntu.com/security/CVE-2021-3448 third-party-advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q1/014835.html third-party-advisory
https://ubuntu.com/security/notices/USN-4976-1 vendor-advisory
https://ubuntu.com/security/notices/USN-4976-2 vendor-advisory
https://www.cve.org/CVERecord?id=CVE-2021-3448 third-party-advisory

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