Explain 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.
Affected Products: n/a
References: [{'name': '1032032', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://www.securitytracker.com/id/1032032'}, {'name': 'USN-2567-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/USN-2567-1'}, {'name': 'VU#374268', 'tags': ['third-party-advisory', 'x_refsource_CERT-VN'], 'url': 'http://www.kb.cert.org/vuls/id/374268'}, {'name': 'SSRT102029', 'tags': ['vendor-advisory', 'x_refsource_HP'], 'url': 'http://marc.info/?l=bugtraq&m=143213867103400&w=2'}, {'name': 'FEDORA-2015-5761', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://kc.mcafee.com/corporate/index?page=content&id=SB10114'}, {'name': 'FEDORA-2015-5874', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html'}, {'name': 'APPLE-SA-2015-06-30-2', 'tags': ['vendor-advisory', 'x_refsource_APPLE'], 'url': 'http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html'}, {'name': 'openSUSE-SU-2015:0775', 'tags': ['vendor-advisory', 'x_refsource_SUSE'], 'url': 'http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html'}, {'name': 'GLSA-201509-01', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201509-01'}, {'name': '20150408 Network Time Protocol Daemon MAC Checking Failure Authentication Bypass Vulnerability', 'tags': ['vendor-advisory', 'x_refsource_CISCO'], 'url': 'http://tools.cisco.com/security/center/viewAlert.x?alertId=38276'}, {'name': 'HPSBUX03333', 'tags': ['vendor-advisory', 'x_refsource_HP'], 'url': 'http://marc.info/?l=bugtraq&m=143213867103400&w=2'}, {'name': 'MDVSA-2015:202', 'tags': ['vendor-advisory', 'x_refsource_MANDRIVA'], 'url': 'http://www.mandriva.com/security/advisories?name=MDVSA-2015:202'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html'}, {'name': '73951', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/73951'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://support.apple.com/kb/HT204942'}, {'name': 'RHSA-2015:1459', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'http://rhn.redhat.com/errata/RHSA-2015-1459.html'}, {'name': '20150408 Multiple Vulnerabilities in ntpd (April 2015) Affecting Cisco Products', 'tags': ['vendor-advisory', 'x_refsource_CISCO'], 'url': 'http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://bugs.ntp.org/show_bug.cgi?id=2779'}, {'name': 'DSA-3223', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'http://www.debian.org/security/2015/dsa-3223'}]
CVE State: PUBLISHED