CVE ID:	CVE-2015-1798
Description:	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.
Test IDs:	1.3.6.1.4.1.25623.1.0.871405   1.3.6.1.4.1.25623.1.1.1.2.2015.192   1.3.6.1.4.1.25623.1.0.871492   1.3.6.1.4.1.25623.1.1.4.2016.2094.1   1.3.6.1.4.1.25623.1.0.703223
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2015-1798 1032032 http://www.securitytracker.com/id/1032032 20150408 Multiple Vulnerabilities in ntpd (April 2015) Affecting Cisco Products http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd 20150408 Network Time Protocol Daemon MAC Checking Failure Authentication Bypass Vulnerability http://tools.cisco.com/security/center/viewAlert.x?alertId=38276 73951 http://www.securityfocus.com/bid/73951 APPLE-SA-2015-06-30-2 http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html DSA-3223 http://www.debian.org/security/2015/dsa-3223 FEDORA-2015-5761 http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html FEDORA-2015-5874 http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html GLSA-201509-01 https://security.gentoo.org/glsa/201509-01 HPSBUX03333 http://marc.info/?l=bugtraq&m=143213867103400&w=2 MDVSA-2015:202 http://www.mandriva.com/security/advisories?name=MDVSA-2015:202 RHSA-2015:1459 http://rhn.redhat.com/errata/RHSA-2015-1459.html SSRT102029 http://marc.info/?l=bugtraq&m=143213867103400&w=2 USN-2567-1 http://www.ubuntu.com/usn/USN-2567-1 VU#374268 http://www.kb.cert.org/vuls/id/374268 http://bugs.ntp.org/show_bug.cgi?id=2779 http://bugs.ntp.org/show_bug.cgi?id=2779 http://support.apple.com/kb/HT204942 http://support.apple.com/kb/HT204942 http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html https://kc.mcafee.com/corporate/index?page=content&id=SB10114 https://kc.mcafee.com/corporate/index?page=content&id=SB10114 openSUSE-SU-2015:0775 http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html