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CVE-2016-1938

Published: 26 January 2016

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
firefox
Launchpad, Ubuntu, Debian
precise
Released (44.0+build3-0ubuntu0.12.04.1)
trusty
Released (44.0+build3-0ubuntu0.14.04.1)
upstream
Released (44.0)
vivid
Released (44.0+build3-0ubuntu0.15.04.1)
wily
Released (44.0+build3-0ubuntu0.15.10.1)
xenial
Released (44.0+build3-0ubuntu1)
yakkety
Released (44.0+build3-0ubuntu1)
zesty
Released (44.0+build3-0ubuntu1)
nss
Launchpad, Ubuntu, Debian
precise
Released (2:3.21-0ubuntu0.12.04.1)
trusty
Released (2:3.21-0ubuntu0.14.04.1)
upstream
Released (3.21)
wily
Released (2:3.21-0ubuntu0.15.10.1)
xenial Not vulnerable
(2:3.21-1ubuntu2)
yakkety Not vulnerable
(2:3.21-1ubuntu2)
zesty Not vulnerable
(2:3.21-1ubuntu2)
vivid Ignored
(end of life)
Patches:
upstream: http://hg.mozilla.org/projects/nss/rev/a555bf0fc23a
upstream: http://hg.mozilla.org/projects/nss/rev/608645309ab9
upstream: http://hg.mozilla.org/projects/nss/rev/cfd0ad4726cb
thunderbird
Launchpad, Ubuntu, Debian
precise
Released (1:38.8.0+build1-0ubuntu0.12.04.1)
trusty
Released (1:38.8.0+build1-0ubuntu0.14.04.1)
upstream
Released (38.8.0)
vivid Ignored
(end of life)
wily
Released (1:38.8.0+build1-0ubuntu0.15.10.1)
xenial
Released (1:38.8.0+build1-0ubuntu0.16.04.1)
yakkety
Released (1:38.8.0+build1-0ubuntu1)
zesty
Released (1:38.8.0+build1-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N