CVE-2016-5117 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

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

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9