2015-07-06 04:00:49 2018-01-05 03:30:03

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

Vector

NETWORK

Complexity

MEDIUM

Authentication

NONE

Confidentiality

NONE

Integrity

PARTIAL

Availability

NONE