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, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-315-1, DSA-3300-1, DSA-3324-1, DSA-3336-1
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
jessie1:45.8.0-3~deb8u1fixed
jessie (security)1:52.3.0-4~deb8u2fixed
stretch (security), stretch1:52.3.0-4~deb9u1fixed
buster, sid1:52.3.0-4fixed
iceweasel (PTS)wheezy, wheezy (security)38.8.0esr-1~deb7u1fixed
jessie (security)38.8.0esr-1~deb8u1fixed
nss (PTS)wheezy2:3.14.5-1+deb7u5fixed
wheezy (security)2:3.26-1+debu7u5fixed
jessie2:3.26-1+debu8u2fixed
jessie (security)2:3.26-1+debu8u3fixed
stretch2:3.26.2-1.1fixed
stretch (security)2:3.26.2-1.1+deb9u1fixed
buster, sid2:3.33-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
icedovesource(unstable)38.1.0-1medium
icedovesourcejessie31.8.0-1~deb8u1mediumDSA-3324-1
icedovesourcesqueeze(unfixed)end-of-life
icedovesourcewheezy31.8.0-1~deb7u1mediumDSA-3324-1
iceweaselsource(unstable)38.1.0esr-1medium
iceweaselsourcejessie31.8.0esr-1~deb8u1mediumDSA-3300-1
iceweaselsourcesqueeze(unfixed)end-of-life
iceweaselsourcewheezy31.8.0esr-1~deb7u1mediumDSA-3300-1
nsssource(unstable)2:3.19.1-1medium
nsssourcejessie2:3.17.2-1.1+deb8u1mediumDSA-3336-1
nsssourcesqueeze3.12.8-1+squeeze12mediumDLA-315-1
nsssourcewheezy2:3.14.5-1+deb7u5mediumDSA-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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