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FreeBSD: VID-5B72B1FF-877C-11EB-BD4F-2F1D57DAFE46 (CVE-2021-3448): dnsmasq -- cache poisoning vulnerability in certain configurations

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FreeBSD: VID-5B72B1FF-877C-11EB-BD4F-2F1D57DAFE46 (CVE-2021-3448): dnsmasq -- cache poisoning vulnerability in certain configurations

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
03/17/2021
Created
03/19/2021
Added
03/18/2021
Modified
06/03/2021

Description

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-5B72B1FF-877C-11EB-BD4F-2F1D57DAFE46:

Simon Kelley reports:

[In configurations where the forwarding server address contains an @

character for specifying a sending interface or source address, the]

random source port behavior was disabled, making cache poisoning

attacks possible.

This only affects configurations of the form server=1.1.1.1@em0 or

server=1.1.1.1@192.0.2.1, i. e. those that specify an interface to

send through, or an IP address to send from, or use together with

NetworkManager.

Solution(s)

  • freebsd-upgrade-package-dnsmasq
  • freebsd-upgrade-package-dnsmasq-devel

References

  • CVE-2021-3448

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