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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 1.05% Top 25%
Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory gentoo.org Vendor Advisory opensuse.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2016-1938?
CVE-2016-1938 has been scored as a medium severity vulnerability.
How to fix CVE-2016-1938?
To fix CVE-2016-1938, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-1938 being actively exploited in the wild?
It is possible that CVE-2016-1938 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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