Bug 1305159 (CVE-2016-1938)

Summary: CVE-2016-1938 Mozilla NSS: Errors in mp_div and mp_exptmod cryptographic functions
Product: [Other] Security Response Reporter: Kurt Seifried <kseifried>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: emaldona, kdudka, kengert, slawomir
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2016-02-12 08:17:59 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 1305160    

Description Kurt Seifried 2016-02-05 21:07:22 UTC 
The Mozilla Project reports:

Security researcher Hanno Böck reported that calculations with mp_div and mp_exptmod in Network Security Services (NSS) can produce wrong results in some circumstances. These functions are used within NSS for a variety of cryptographic division functions, leading to potential cryptographic weaknesses.

External references:
https://www.mozilla.org/en-US/security/advisories/mfsa2016-07/
https://blog.fuzzing-project.org/37-Mozilla-NSS-Wrong-calculation-results-in-mp_div-and-mp_exptmod.html
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
Comment 1 Huzaifa S. Sidhpurwala 2016-02-12 08:23:36 UTC 
This issue has been addressed upstream via nss-3.21