CVE-2015-3193

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 20.21% Top 5%
Vendor Advisory cisco.com Vendor Advisory slackware.com Vendor Advisory slackware.com Vendor Advisory ubuntu.com Vendor Advisory openssl.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl third party advisory vendor advisory
https://kb.isc.org/article/AA-01438 third party advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html third party advisory patch
https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.html third party advisory
http://www.fortiguard.com/advisory/openssl-advisory-december-2015 third party advisory
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583 third party advisory vendor advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html third party advisory patch
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100 third party advisory
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.539966 third party advisory vendor advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761 third party advisory
http://www.ubuntu.com/usn/USN-2830-1 third party advisory vendor advisory
http://www.securityfocus.com/bid/78705 vdb entry third party advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html third party advisory patch
http://www.securityfocus.com/bid/91787 vdb entry third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1288317 issue tracking third party advisory
http://openssl.org/news/secadv/20151203.txt vendor advisory
http://www.securitytracker.com/id/1034294 vdb entry third party advisory
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=d73cc256c8e256c32ed959456101b73ba9842f72
http://fortiguard.com/advisory/openssl-advisory-december-2015 third party advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322 third party advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759 third party advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Frequently Asked Questions

What is the severity of CVE-2015-3193?
CVE-2015-3193 has been scored as a high severity vulnerability.
How to fix CVE-2015-3193?
To fix CVE-2015-3193, 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-2015-3193 being actively exploited in the wild?
It is possible that CVE-2015-3193 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~20% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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