CVE-2015-2721

NameCVE-2015-2721
DescriptionMozilla 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.
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)
ReferencesDLA-315-1, DSA-3300-1, DSA-3324-1, DSA-3336-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
icedove (PTS)jessie1:52.3.0-4~deb8u2fixed
nss (PTS)jessie2:3.26-1+debu8u3fixed
jessie (security)2:3.26-1+debu8u6fixed
stretch (security), stretch2:3.26.2-1.1+deb9u1fixed
buster2:3.42.1-1+deb10u1fixed
bullseye2:3.45-1fixed
sid2:3.47-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
icedovesource(unstable)38.1.0-1
icedovesourcejessie31.8.0-1~deb8u1DSA-3324-1
icedovesourcesqueeze(unfixed)end-of-life
icedovesourcewheezy31.8.0-1~deb7u1DSA-3324-1
iceweaselsource(unstable)38.1.0esr-1
iceweaselsourcejessie31.8.0esr-1~deb8u1DSA-3300-1
iceweaselsourcesqueeze(unfixed)end-of-life
iceweaselsourcewheezy31.8.0esr-1~deb7u1DSA-3300-1
nsssource(unstable)2:3.19.1-1
nsssourcejessie2:3.17.2-1.1+deb8u1DSA-3336-1
nsssourcesqueeze3.12.8-1+squeeze12DLA-315-1
nsssourcewheezy2:3.14.5-1+deb7u5DSA-3336-1

Notes

NSS patch: https://hg.mozilla.org/projects/nss/rev/6b4770c76bc8
NSS testcase: https://hg.mozilla.org/projects/nss/rev/1865635f5df5
https://www.mozilla.org/en-US/security/advisories/mfsa2015-71/

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