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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 3 releases
| Version | Status | Fixed in |
|---|---|---|
| 42.1 | Affected | — |
| 13.2 | Affected | — |
| 13.1 | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2:3.21-1 |
| sid | Fixed | 2:3.21-1 |
| forky | Fixed | 2:3.21-1 |
| bullseye | Fixed | 2:3.21-1 |
| bookworm | Fixed | 2:3.21-1 |
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
- https://security-tracker.debian.org/tracker/CVE-2016-1938
CWEs
CWE-310
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.