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.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1672528

https://www.mozilla.org/security/advisories/mfsa2020-50/

https://www.mozilla.org/security/advisories/mfsa2020-51/

https://www.mozilla.org/security/advisories/mfsa2020-52/

Details

Risk Information

CVSS v2

CVSS v3