Denial of Service Vulnerability in NTPd's Symmetric-Key Feature

CVE-2015-1799 · MEDIUM Severity

AV:A/AC:M/AU:N/C:N/I:P/A:P

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in-the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer.

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