CVE-2016-1938

MEDIUM

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

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

Details

Source: MITRE

Published: 2016-01-31

Updated: 2018-10-30

Type: CWE-310

Risk Information

CVSS v2.0

Base Score: 6.4

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N

Impact Score: 4.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 6.5

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

Impact Score: 2.5

Exploitability Score: 3.9

Severity: MEDIUM