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.

Score

CVSS 3.0 5.9 Medium

Status

Modified - cve@mitre.org

Published

2017-01-31

Last modified

2024-08-06

Weaknesses

CWE-254

Affected products

• 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