CVE-2018-8956

ntpd en ntp versiones 4.2.8p10, 4.2.8p11, 4.2.8p12 y 4.2.8p13, permiten a atacantes remotos impedir que un cliente de multidifusión sincronice su reloj con un servidor NTP de multidifusión por medio de paquetes de modo 3 y modo 5 suplantados. El atacante debe ser parte de la misma red de multidifusión o controlar un esclavo en esa red de multidifusión que puede capturar determinados paquetes requeridos en nombre del atacante y enviarlos luego al atacante.

An update that solves four vulnerabilities and has two fixes is now available. This update for ntp fixes the following issues. Ntp was updated to 4.2.8p15. Fixed an issue which a server mode packet with spoofed source address frequently send to the client ntpd could have caused denial of service. Fixed an issue which could have allowed remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets. Fixed an issue which an off-path attacker with the ability to query time from victim's ntpd instance could have modified the victim's clock by a limited amount. Fixed an issue which remote attacker could have caused denial of service by consuming the memory when a CMAC key was used andassociated with a CMAC algorithm in the ntp.keys. This update was imported from the SUSE:SLE-15:Update update project.