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CVE-2020-26961

Published: Dec 9, 2020

Modified: Aug 4, 2024

PUBLISHED

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.

Vendor	Product	Versions
Mozilla	Firefox	affected `< 83`
Mozilla	Firefox ESR	affected `< 78.5`
Mozilla	Thunderbird	affected `< 78.5`

References

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

x_refsource_MISC

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

x_refsource_CONFIRM

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

x_refsource_CONFIRM

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

x_refsource_CONFIRM

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