CVE-2020-25686 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Reference

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

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

3.7