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.
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2022-20/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2022-22/ | vendor advisory |
| https://www.mozilla.org/security/advisories/mfsa2022-21/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1730434 | issue tracking permissions required vendor advisory |