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CVE-2015-1798

Published: 8 April 2015

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.

Notes

AuthorNote
mdeslaur
4.2.5p99+ only

Priority

Medium

Status

Package Release Status
ntp
Launchpad, Ubuntu, Debian
upstream
Released (4.2.8p2)
lucid Not vulnerable
(1:4.2.4p8+dfsg-1ubuntu2.3)
precise
Released (1:4.2.6.p3+dfsg-1ubuntu3.4)
trusty
Released (1:4.2.6.p5+dfsg-3ubuntu2.14.04.3)
utopic
Released (1:4.2.6.p5+dfsg-3ubuntu2.14.10.3)
Patches:
upstream: http://bk.ntp.org/ntp-stable/?PAGE=patch&REV=550a80b0iGyIv4t9J1GJ_74V_eEx4A