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.
Products affected by CVE-2016-5117
- cpe:2.3:a:openntpd:openntpd:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-5117
0.27%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 48 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-5117
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
2.2
|
3.6
|
NIST |
CWE ids for CVE-2016-5117
-
Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-5117
-
http://www.openwall.com/lists/oss-security/2016/05/23/2
oss-security - CVE request: OpenNTPD not verifying CN during HTTPS constraints requestMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2016/05/29/6
oss-security - Re: CVE request: OpenNTPD not verifying CN during HTTPS constraints requestMailing List;Third Party Advisory
-
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/ntpd/constraint.c.diff?r1=1.27&r2=1.28
Patch
-
http://www.openntpd.org/txt/release-6.0p1.txt
Vendor Advisory
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