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CVE
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CVE-2016-1938Date: (C)2016-02-09   (M)2024-03-27


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 6.5CVSS Score : 6.4
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 2.5Impact Score: 4.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: PARTIAL
Confidentiality: LOWAvailability: NONE
Integrity: LOW 
Availability: NONE 
  
Reference:
SECTRACK-1034825
BID-81955
BID-91787
DSA-3688
GLSA-201605-06
GLSA-201701-46
SUSE-SU-2016:0338
USN-2880-1
USN-2880-2
USN-2903-1
USN-2903-2
USN-2973-1
http://www.mozilla.org/security/announce/2016/mfsa2016-07.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
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
openSUSE-SU-2016:0306
openSUSE-SU-2016:0309

CPE    3
cpe:/o:opensuse:opensuse:13.1
cpe:/a:mozilla:nss:3.20.1
cpe:/a:mozilla:firefox:43.0.4
CWE    1
CWE-310
OVAL    13
oval:org.secpod.oval:def:703114
oval:org.secpod.oval:def:52681
oval:org.secpod.oval:def:32845
oval:org.secpod.oval:def:32844
...

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