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MFSA2015-71 Firefox: NSS incorrectly permits skipping of ServerKeyExchange (CVE-2015-2721)

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MFSA2015-71 Firefox: NSS incorrectly permits skipping of ServerKeyExchange (CVE-2015-2721)

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:P/A:N)
Published
07/05/2015
Created
07/25/2018
Added
07/08/2015
Modified
01/08/2018

Description

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.

Solution(s)

  • mozilla-firefox-esr-upgrade-31_8
  • mozilla-firefox-esr-upgrade-38_1
  • mozilla-firefox-upgrade-39_0

References

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