CVE-2015-3193

high-risk
Published 2015-12-06

The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.

Do I need to act?

!
35.2% chance of exploitation in next 30 days
EPSS score — higher than 65% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (11)

Affected Vendors

Openssl Nodejs Canonical

References (44)

Third Party Advisory http://fortiguard.com/advisory/openssl-advisory-december-2015
Third Party Advisory http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
Third Party Advisory http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761
Vendor Advisory http://openssl.org/news/secadv/20151203.txt
Third Party Advisory http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20...
Third Party Advisory http://www.fortiguard.com/advisory/openssl-advisory-december-2015
Patch http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
Patch http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
Patch http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
Third Party Advisory http://www.securityfocus.com/bid/78705
Third Party Advisory http://www.securityfocus.com/bid/91787
Third Party Advisory http://www.securitytracker.com/id/1034294
Third Party Advisory http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slack...
Third Party Advisory http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slack...
Third Party Advisory http://www.ubuntu.com/usn/USN-2830-1
Third Party Advisory https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_...
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1288317
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=d73cc256c8e256c32ed9594561...
Third Party Advisory https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c...
and 24 more references
58
/ 100
high-risk
Severity 26/34 · High
Exploitability 16/34 · Moderate
Exposure 16/34 · Moderate