Описание
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
It was found that when ntp is configured with rate limiting for all associations the limits are also applied to responses received from its configured sources. A remote attacker who knows the sources can cause a denial of service by preventing ntpd from accepting valid responses from its sources.
Меры по смягчению последствий
If you choose to use restrict default limited ..., be sure to use restrict source ... (without limited) to avoid this attack.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | ntp | Will not fix | ||
| Red Hat Enterprise Linux 6 | ntp | Fixed | RHSA-2017:0252 | 06.02.2017 |
| Red Hat Enterprise Linux 7 | ntp | Fixed | RHSA-2017:0252 | 06.02.2017 |
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Дополнительная информация
Статус:
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2
Связанные уязвимости
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
NTP before 4.2.8p9 rate limits responses received from the configured ...
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
EPSS
5.9 Medium
CVSS3
4.3 Medium
CVSS2