CVE-2016-1938

Description

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.

Predictions

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

References

• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00010.html
• http://www.debian.org/security/2016/dsa-3688
• http://www.mozilla.org/security/announce/2016/mfsa2016-07.html
• http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
• http://www.securityfocus.com/bid/81955
• http://www.securityfocus.com/bid/91787
• http://www.securitytracker.com/id/1034825
• http://www.ubuntu.com/usn/USN-2880-1
• http://www.ubuntu.com/usn/USN-2880-2
• http://www.ubuntu.com/usn/USN-2903-1
• http://www.ubuntu.com/usn/USN-2903-2
• http://www.ubuntu.com/usn/USN-2973-1
• https://blog.fuzzing-project.org/37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1190248
• https://bugzilla.mozilla.org/show_bug.cgi?id=1194947
• https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes
• https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_div.c
• https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_exptmod.c
• https://hg.mozilla.org/projects/nss/diff/a555bf0fc23a/lib/freebl/mpi/mpi.c
• https://security.gentoo.org/glsa/201605-06
• https://security.gentoo.org/glsa/201701-46
• https://security-tracker.debian.org/tracker/CVE-2016-1938

CWEs

CWE-310