CVE-2016-1938
6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.8 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.2%
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 configurations
References
lists.opensuse.org/opensuse-security-announce/2016-02/msg00001.html
lists.opensuse.org/opensuse-security-announce/2016-02/msg00002.html
lists.opensuse.org/opensuse-security-announce/2016-02/msg00010.html
www.debian.org/security/2016/dsa-3688
www.mozilla.org/security/announce/2016/mfsa2016-07.html
www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
www.securityfocus.com/bid/81955
www.securityfocus.com/bid/91787
www.securitytracker.com/id/1034825
www.ubuntu.com/usn/USN-2880-1
www.ubuntu.com/usn/USN-2880-2
www.ubuntu.com/usn/USN-2903-1
www.ubuntu.com/usn/USN-2903-2
www.ubuntu.com/usn/USN-2973-1
blog.fuzzing-project.org/37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html
bugzilla.mozilla.org/show_bug.cgi?id=1190248
bugzilla.mozilla.org/show_bug.cgi?id=1194947
developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.21_release_notes
github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_div.c
github.com/hannob/bignum-fuzz/blob/master/CVE-2016-1938-nss-mp_exptmod.c
hg.mozilla.org/projects/nss/diff/a555bf0fc23a/lib/freebl/mpi/mpi.c
security.gentoo.org/glsa/201605-06
security.gentoo.org/glsa/201701-46
Related
6.4 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.8 High
AI Score
Confidence
High
0.003 Low
EPSS
Percentile
71.2%