Isaac E. Cohen

**Name of the Vulnerable Software and Affected Versions** NTP versions prior to 4.2.8p5 **Description** The issue allows remote attackers to bypass security restrictions by exploiting the failure to correctly implement the threshold limitation for the '-g' option. This can be achieved by responding to an unspecified number of requests from trusted sources, potentially allowing an attacker to set NTP to an arbitrary time or alter the time by up to 900 seconds, and leveraging a resulting denial of service. An attacker could exploit this using man-in-the-middle techniques to intercept NTP traffic and make multiple steps larger than the panic threshold. **Recommendations** For NTP versions prior to 4.2.8p5, update to version 4.2.8p5 or later to resolve the issue. As a temporary workaround, consider restricting access to trusted sources to minimize the risk of exploitation. Avoid using the '-g' option until the issue is resolved.

**Name of the Vulnerable Software and Affected Versions** NTP versions 4.x before 4.2.8p4 NTP versions 4.3.x before 4.3.77 **Description** The rate limiting feature in NTP allows remote attackers to have unspecified impact via a large number of crafted requests. This issue exists due to insufficient input validation, which may allow a remote attacker to cause partial disruption of confidentiality, integrity, and availability of protected information by sending a large number of reverse requests. **Recommendations** For NTP versions 4.x before 4.2.8p4, update to version 4.2.8p4 or later. For NTP versions 4.3.x before 4.3.77, update to version 4.3.77 or later.

**Name of the Vulnerable Software and Affected Versions** NTP versions 4.x before 4.2.8p4 NTP versions 4.3.x before 4.3.77 **Description** The issue allows remote attackers to cause a denial of service via a number of crafted "KOD" messages. **Recommendations** For NTP versions 4.x before 4.2.8p4, update to version 4.2.8p4 or later. For NTP versions 4.3.x before 4.3.77, update to version 4.3.77 or later.