CVE-2016-1938

MEDIUM

Mozilla NSS <3.21 - Memory Corruption

Title source: llm

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.

References (23)

[Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html

[Third Party Advisory] http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00010.html

[Vendor Advisory] http://www.mozilla.org/security/announce/2016/mfsa2016-07.html

[Third Party Advisory] http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/91787

[Third Party Advisory, VDB Entry] http://www.securitytracker.com/id/1034825

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2880-1

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2880-2

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2903-1

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2903-2

[Vendor Advisory] http://www.ubuntu.com/usn/USN-2973-1

[Various Sources] https://blog.fuzzing-project.org/37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html

[Issue Tracking] https://bugzilla.mozilla.org/show_bug.cgi?id=1190248

[Issue Tracking] https://bugzilla.mozilla.org/show_bug.cgi?id=1194947

[Vendor Advisory] https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes

[Various Sources] https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_div.c

[Various Sources] https://github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_exptmod.c

View Writeup ZIP pw:eip

[Various Sources] https://hg.mozilla.org/projects/nss/diff/a555bf0fc23a/lib/freebl/mpi/mpi.c

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/81955

... and 3 more

Scores

CVSS v3 6.5

EPSS 0.0105

EPSS Percentile 77.3%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Classification

CWE

CWE-310

Status draft

Affected Products (5)

opensuse/leap

opensuse/opensuse

opensuse/opensuse

mozilla/nss < 3.20.1

mozilla/firefox < 43.0.4

Timeline

Published Jan 31, 2016

Tracked Since Feb 18, 2026