Unintended Expiration Dates in Preloaded Public Key Pinning in Mozilla Firefox and Thunderbird

CVE-2016-5284 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:N/A:N

Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 rely on unintended expiration dates for Preloaded Public Key Pinning, which allows man-in-the-middle attackers to spoof add-on updates by leveraging possession of an X.509 server certificate for addons.mozilla.org signed by an arbitrary built-in Certification Authority.

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