CVE-2016-5117

Impact

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.

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• 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