| Package | Affected versions | Patched versions |
|---|---|---|
| ntp | ≤ 4.2.7p444 |
The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.
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