Vulnerability Details CVE-2016-5117
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.007
EPSS Ranking 48.4%
CVSS Severity
CVSS v3 Score 5.9
CVSS v2 Score 4.3
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
- 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