Vulnerability CVE-2016-5117
Published: 2017-01-31

Description:
OpenNTPD before 6.0p1 does not validate the CN for HTTPS constraint requests, which allows remote attackers to bypass the man-in-the-middle mitigations via a crafted timestamp constraint with a valid certificate.

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Openntpd -> Openntpd 

 References:
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28
http://www.openntpd.org/txt/release-6.0p1.txt
http://www.openwall.com/lists/oss-security/2016/05/23/2
http://www.openwall.com/lists/oss-security/2016/05/29/6
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