Red Hat Security Advisory 2015-2231-04 - The Network Time Protocol is used to synchronize a computer's time with another referenced time source. These packages include the ntpd service which continuously adjusts system time and utilities used to query and configure the ntpd service. It was found that because NTP's access control was based on a source IP address, an attacker could bypass source IP restrictions and send malicious control and configuration packets by spoofing ::1 addresses. A denial of service flaw was found in the way NTP hosts that were peering with each other authenticated themselves before updating their internal state variables. An attacker could send packets to one peer host, which could cascade to other peers, and stop the synchronization process among the reached peers.
738d8a326cd620fcecec2cb10f69355bGentoo Linux Security Advisory 201509-1 - Multiple vulnerabilities have been found in NTP, the worst of which could lead to arbitrary code execution. Versions less than 4.2.8_p3 are affected.
690cff39099f7954c4d025d1c4f49fcaRed Hat Security Advisory 2015-1459-01 - The Network Time Protocol is used to synchronize a computer's time with another referenced time source. It was found that because NTP's access control was based on a source IP address, an attacker could bypass source IP restrictions and send malicious control and configuration packets by spoofing ::1 addresses. A denial of service flaw was found in the way NTP hosts that were peering with each other authenticated themselves before updating their internal state variables. An attacker could send packets to one peer host, which could cascade to other peers, and stop the synchronization process among the reached peers.
fae2ba19f95684d8408b3bc551cf47eaApple Security Advisory 2015-06-30-2 - OS X Yosemite 10.10.4 and Security Update 2015-005 are now available and address privilege escalation, arbitrary code execution, access bypass, and various other vulnerabilities.
32e0fef51b76ce3c73ed6338172843e8HP Security Bulletin HPSBUX03333 SSRT102029 1 - Potential security vulnerabilities have been identified with HP-UX running NTP. These could be exploited remotely to create a Denial of Service (DoS), or other vulnerabilities. Revision 1 of this advisory.
883d246475dafdf0ffa4a74f99eb6cadSlackware Security Advisory - New ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.
3f19233335ccc5a990ba56407940e259Ubuntu Security Notice 2567-1 - Miroslav Lichvar discovered that NTP incorrectly validated MAC fields. A remote attacker could possibly use this issue to bypass authentication and spoof packets. Miroslav Lichvar discovered that NTP incorrectly handled certain invalid packets. A remote attacker could possibly use this issue to cause a denial of service. Juergen Perlinger discovered that NTP incorrectly generated MD5 keys on big-endian platforms. This issue could either cause ntp-keygen to hang, or could result in non-random keys. Various other issues were also addressed.
68e74f99cc5e8560803ab798f05835a7Debian Linux Security Advisory 3223-1 - Multiple vulnerabilities were discovered in ntp, an implementation of the Network Time Protocol.
5d125f426d730e60a372a5c7035a715cMandriva Linux Security Advisory 2015-202 - The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 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. The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 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 by spoofing the source IP address of a peer. The updated packages provides a solution for these security issues.
7a8c01f594afc03d69e3c421ba97bc4aFreeBSD Security Advisory - The ntpd(8) daemon is an implementation of the Network Time Protocol (NTP) used to synchronize the time of a computer system to a reference time source. The vallen packet value is not validated in several code paths in ntp_crypto.c. When ntpd(8) is configured to use a symmetric key to authenticate a remote NTP server/peer, it checks if the NTP message authentication code (MAC) in received packets is valid, but not that there actually is any MAC included, and packets without a MAC are accepted as if they had a valid MAC. NTP state variables are updated prior to validating the received packets.
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