Podatność CVE-2020-25684
Publikacja: 2021-01-20

Opis:
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

Typ:

CWE-358

 (Improperly Implemented Security Check for Standard)

 Referencje:
https://bugzilla.redhat.com/show_bug.cgi?id=1889686
https://www.jsof-tech.com/disclosures/dnspooq/
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