CVE-2020-26961

CVE Details

Release Date:

2020-12-09

Description

When DNS over HTTPS is in use, it intentionally filters RFC1918 and related IP ranges from the responses as these do not make sense coming from a DoH resolver. However when an IPv4 address was mapped through IPv6, these addresses were erroneously let through, leading to a potential DNS Rebinding attack. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

See more information about CVE-2020-26961 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	6.5	Base Metrics:	AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Access Vector:	Network	Attack Complexity:	Low
Privileges Required:	None	User Interaction:	Required
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	High	Availability Impact:	None

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (firefox)	ELSA-2020-5257	2020-12-01
Oracle Linux version 6 (thunderbird)	ELSA-2020-5238	2020-12-01
Oracle Linux version 7 (firefox)	ELSA-2020-5239	2020-12-01
Oracle Linux version 7 (thunderbird)	ELSA-2020-5235	2020-12-01
Oracle Linux version 8 (firefox)	ELSA-2020-5237	2020-12-01
Oracle Linux version 8 (thunderbird)	ELSA-2020-5236	2020-12-01

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team