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.
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History
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2024-08-04T15:40:36.677Z
Reserved: 2020-09-16T00:00:00
Link: CVE-2020-25686

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Status : Modified
Published: 2021-01-20T17:15:13.000
Modified: 2024-11-21T05:18:28.027
Link: CVE-2020-25686
