Detections
Analytics
CVE-2020-25686
low
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.
References
https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective
https://www.tenable.com/blog/dnspooq-seven-vulnerabilities-identified-in-dnsmasq
https://www.jsof-tech.com/disclosures/dnspooq/
https://www.debian.org/security/2021/dsa-4844
https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61