A flaw was found when receiving a query, where dnsmasq before version 2.83 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 would have to be performed 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.
A flaw was found when receiving a query, where dnsmasq before version 2.83 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 would have to be performed 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.
https://www.openwall.com/lists/oss-security/2021/01/19/1 https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q1/014599.html https://www.jsof-tech.com/disclosures/dnspooq/ https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=15b60ddf935a531269bb8c68198de012a4967156 https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=6a6e06fbb0d4690507ceaf2bb6f0d8910f3d4914
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