An attacker could have exploited a timing attack by sending...

Vulnerability Description

An attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between invalid key handles and cross-origin key handles. This could have led to cross-origin account linking in violation of WebAuthn goals. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

References

• https://www.mozilla.org/security/advisories/mfsa2022-20/
• https://www.mozilla.org/security/advisories/mfsa2022-22/
• https://www.mozilla.org/security/advisories/mfsa2022-21/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1730434