CVE-2016-5117
medium
CVSS v3
5.9
CVSS v4 NEW
—
VIR risk
5.9
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.
Predictions
Exploit likelihood
69%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 1:6.0p1-1 |
| debian | bullseye | fixed | 1:6.0p1-1 |
| debian | forky | fixed | 1:6.0p1-1 |
| debian | sid | fixed | 1:6.0p1-1 |
| debian | trixie | fixed | 1:6.0p1-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| openntpd | openntpd | {"endIncluding":"6.0"} | |
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
- https://security-tracker.debian.org/tracker/CVE-2016-5117
CWEs
CWE-254
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.