Explain CVE-2016-1938
The s_mp_div function in lib/freebl/mpi/mpi.c in Mozilla Network Security Services (NSS) before 3.21, as used in Mozilla Firefox before 44.0, improperly divides numbers, which might make it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging use of the (1) mp_div or (2) mp_exptmod function.
Affected Products: n/a
References: [{'name': '81955', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/81955'}, {'name': 'DSA-3688', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'http://www.debian.org/security/2016/dsa-3688'}, {'name': '1034825', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://www.securitytracker.com/id/1034825'}, {'name': 'GLSA-201701-46', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201701-46'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html'}, {'name': 'USN-2903-2', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2903-2'}, {'name': 'USN-2880-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2880-1'}, {'name': 'USN-2903-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2903-1'}, {'name': 'USN-2880-2', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2880-2'}, {'tags': ['x_refsource_MISC'], 'url': 'https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_exptmod.c'}, {'tags': ['x_refsource_MISC'], 'url': 'https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes'}, {'name': 'SUSE-SU-2016:0338', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00010.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.mozilla.org/security/announce/2016/mfsa2016-07.html'}, {'tags': ['x_refsource_MISC'], 'url': 'https://blog.fuzzing-project.org/37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html'}, {'name': 'USN-2973-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2973-1'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://bugzilla.mozilla.org/show_bug.cgi?id=1194947'}, {'name': 'openSUSE-SU-2016:0309', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html'}, {'name': '91787', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/91787'}, {'tags': ['x_refsource_MISC'], 'url': 'https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_div.c'}, {'name': 'GLSA-201605-06', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201605-06'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://bugzilla.mozilla.org/show_bug.cgi?id=1190248'}, {'name': 'openSUSE-SU-2016:0306', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://hg.mozilla.org/projects/nss/diff/a555bf0fc23a/lib/freebl/mpi/mpi.c'}]
CVE State: PUBLISHED