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LIN7-4980 : Security Advisory - ntp - CVE-2015-7871

Created: Oct 21, 2015    Updated: Sep 8, 2018
Resolved Date: Oct 27, 2015
Previous ID: LIN4-33048
Found In Version:
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 7
Component/s: Userspace


Unauthenticated off-path attackers can force ntpd processes to peer with malicious time sources of the attacker’s choosing allowing the attacker to make arbitrary changes to system time. This attack leverages a logic error in ntpd’s handling of certain crypto-NAK packets. When a vulnerable ntpd receives an NTP symmetric active crypto-NAK packet, it will peer with the sender bypassing the authentication typically required to establish a peer association.

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