CVE-2016-0701

LOW

Description

The DH_check_pub_key function in crypto/dh/dh_check.c in OpenSSL 1.0.2 before 1.0.2f does not ensure that prime numbers are appropriate for Diffie-Hellman (DH) key exchange, which makes it easier for remote attackers to discover a private DH exponent by making multiple handshakes with a peer that chose an inappropriate number, as demonstrated by a number in an X9.42 file.

References

http://intothesymmetry.blogspot.com/2016/01/openssl-key-recovery-attack-on-dh-small.html

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

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176373.html

http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00009.html

http://www.openssl.org/news/secadv/20160128.txt

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/82233

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

http://www.securitytracker.com/id/1034849

http://www.ubuntu.com/usn/USN-2883-1

https://git.openssl.org/?p=openssl.git;a=commit;h=878e2c5b13010329c203f309ed0c8f2113f85648

https://git.openssl.org/?p=openssl.git;a=commit;h=c5b831f21d0d29d1e517d139d9d101763f60c9a2

https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03724en_us

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05164821

https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390893

https://security.gentoo.org/glsa/201601-05

https://www.kb.cert.org/vuls/id/257823

Details

Source: MITRE

Published: 2016-02-15

Updated: 2017-12-13

Type: CWE-200

Risk Information

CVSS v2.0

Base Score: 2.6

Vector: (AV:N/AC:H/Au:N/C:P/I:N/A:N)

Impact Score: 2.9

Exploitability Score: 4.9

Severity: LOW

CVSS v3.0

Base Score: 3.7

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Impact Score: 1.4

Exploitability Score: 2.2

Severity: LOW