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ntpd restrictions bypass
Published:08.04.2015
Source:
SecurityVulns ID:14360
Type:remote
Threat Level:
6/10
Description:message authentication code implementation is invalid and can be bypasses.
Affected:FREEBSD : FreeBSD 10.1
 FREEBSD : FreeBSD 9.3
 FREEBSD : FreeBSD 8.4
CVE:CVE-2015-1799 (The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.)
 CVE-2015-1798 (The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.)
Original documentdocumentFREEBSD, FreeBSD Security Advisory FreeBSD-SA-15:07.ntp (08.04.2015)

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