CVE-2016-5117

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.27%
Vendor Advisory openntpd.org
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2016-5117?
CVE-2016-5117 has been scored as a medium severity vulnerability.
How to fix CVE-2016-5117?
To fix CVE-2016-5117, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-5117 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2016-5117 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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