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.
367755c77b0b38eda48b414ce2bd65326fc2b4deda486e3ad955cc5616ae75beRed 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.
292d8ca5b04a2f5aab4962efda1c64dffab84339c55708e99400ce963f037fb7Mandriva Linux Security Advisory 2015-140 - If no authentication key is defined in the ntp.conf file, a cryptographically-weak default key is generated. ntp-keygen before 4.2.7p230 uses a non-cryptographic random number generator with a weak seed to generate symmetric keys. A remote unauthenticated attacker may craft special packets that trigger buffer overflows in the ntpd functions crypto_recv() (when using autokey authentication), ctl_putdata(), and configure(). The resulting buffer overflows may be exploited to allow arbitrary malicious code to be executed with the privilege of the ntpd process. A section of code in ntpd handling a rare error is missing a return statement, therefore processing did not stop when the error was encountered. This situation may be exploitable by an attacker. Stephen Roettger of the Google Security Team, Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation discovered that the length value in extension fields is not properly validated in several code paths in ntp_crypto.c, which could lead to information leakage or denial of service. Stephen Roettger of the Google Security Team reported that ACLs based on IPv6 ::1 addresses can be bypassed. The ntp package has been patched to fix these issues.
6c051822021817ac7fc8875977c5ca320de4662ed0ed8219480997118279051dMandriva Linux Security Advisory 2015-046 - Stephen Roettger of the Google Security Team, Sebastian Krahmer of the SUSE Security Team and Harlan Stenn of Network Time Foundation discovered that the length value in extension fields is not properly validated in several code paths in ntp_crypto.c, which could lead to information leakage or denial of service. Stephen Roettger of the Google Security Team reported that ACLs based on IPv6 ::1 addresses can be bypassed.
1738bc161859133a34d1c1b3f945bb293d62965b7ce6af9e1ab54e8936be9dd5Ubuntu Security Notice 2497-1 - Stephen Roettger, Sebastian Krahmer, and Harlan Stenn discovered that NTP incorrectly handled the length value in extension fields. A remote attacker could use this issue to possibly obtain leaked information, or cause the NTP daemon to crash, resulting in a denial of service. Stephen Roettger discovered that NTP incorrectly handled ACLs based on certain IPv6 addresses.
4f2ff3a4f845a75182dbeab18b0ed522016c38a4abb92f02a822a4c46c7edd86Debian Linux Security Advisory 3154-1 - Several vulnerabilities were discovered in the ntp package, an implementation of the Network Time Protocol.
dcbe226d406b61d19c8b1c51800dc375e88a1e0e32f9b1ca5fd3bcae98146a79
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