Security Vulnerabilities fixed in NTP 2901

Description

An ntpd client that honors Kiss-of-Death responses will honor KoD messages that have been forged by an attacker, causing it to delay or stop querying its servers for time updates. Also, an attacker can forge packets that claim to be from the target and send them to servers often enough that a server that implements KoD rate limiting will send the target machine a KoD response to attempt to reduce the rate of incoming packets, or it may also trigger a firewall block at the server for packets from the target machine. For either of these attacks to succeed, the attacker must know what servers the target is communicating with. An attacker can be anywhere on the Internet and can frequently learn the identity of the target's time source by sending the target a time query.

Affected Applications

NTP

CVE References

CVE-2015-7705 CVE-2015-7704

Other References

http://support.ntp.org/bin/view/Main/NtpBug2901