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Red Hat OpenShift: CVE-2020-25686: dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker

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Red Hat OpenShift: CVE-2020-25686: dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
01/20/2021
Created
03/13/2021
Added
03/12/2021
Modified
05/10/2023

Description

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

Solution(s)

  • linuxrpm-upgrade-redhat-coreos

References

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