DescriptionMozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 do not enforce key pinning upon encountering an X.509 certificate problem that generates a user dialog, which allows user-assisted man-in-the-middle attackers to bypass intended access restrictions by triggering a (1) expired certificate or (2) mismatched hostname for a domain with pinning enabled.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
icedove (PTS)wheezy38.7.0-1~deb7u1fixed
wheezy (security)1:52.3.0-4~deb7u2fixed
jessie (security)1:52.3.0-4~deb8u2fixed
stretch (security), stretch1:52.3.0-4~deb9u1fixed
iceweasel (PTS)wheezy, wheezy (security)38.8.0esr-1~deb7u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
icedovesourcejessie(not affected)
icedovesourcewheezy(not affected)
iceweaselsourcejessie(not affected)
iceweaselsourcewheezy(not affected)


[jessie] - iceweasel <not-affected> (Only affects Firefox 38 and later)
[wheezy] - iceweasel <not-affected> (Only affects Firefox 38 and later)
[jessie] - icedove <not-affected> (Only affects Thunderbird 38 and later)
[wheezy] - icedove <not-affected> (Only affects Thunderbird 38 and later)

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