CVE-2015-3193

MEDIUM

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.

References

http://fortiguard.com/advisory/openssl-advisory-december-2015

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761

http://openssl.org/news/secadv/20151203.txt

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl

http://www.fortiguard.com/advisory/openssl-advisory-december-2015

http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html

http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

http://www.securityfocus.com/bid/78705

http://www.securityfocus.com/bid/91787

http://www.securitytracker.com/id/1034294

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.539966

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583

http://www.ubuntu.com/usn/USN-2830-1

https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.html

https://bugzilla.redhat.com/show_bug.cgi?id=1288317

https://git.openssl.org/?p=openssl.git;a=commit;h=d73cc256c8e256c32ed959456101b73ba9842f72

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322

https://kb.isc.org/article/AA-01438

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100

Details

Source: MITRE

Published: 2015-12-06

Updated: 2017-11-30

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 10

Severity: MEDIUM