CVE-2020-25686

Name
CVE-2020-25686
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.
NVD Severity
low
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Third Party Advisory https://www.jsof-tech.com/disclosures/dnspooq/
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1890125
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
Third Party Advisory https://security.gentoo.org/glsa/202101-17
Third Party Advisory https://www.debian.org/security/2021/dsa-4844
Mailing List https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
Third Party Advisory https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* dnsmasq >= None < 2.83

Vulnerable and fixed packages

Source package Branch Version Maintainer Status