CVE-2015-1798

NameCVE-2015-1798
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-192-1, DSA-3223-1
NVD severitylow (attack range: remote)
Debian Bugs782095

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ntp (PTS)wheezy1:4.2.6.p5+dfsg-2+deb7u6fixed
wheezy (security)1:4.2.6.p5+dfsg-2+deb7u7fixed
jessie (security), jessie1:4.2.6.p5+dfsg-7+deb8u2fixed
stretch1:4.2.8p10+dfsg-3+deb9u1fixed
buster, sid1:4.2.8p10+dfsg-5fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ntpsource(unstable)1:4.2.6.p5+dfsg-6low782095
ntpsourcesqueeze1:4.2.6.p2+dfsg-1+deb6u3lowDLA-192-1
ntpsourcewheezy1:4.2.6.p5+dfsg-2+deb7u4lowDSA-3223-1

Notes

http://bugs.ntp.org/show_bug.cgi?id=2779
http://support.ntp.org/bin/view/Main/SecurityNotice#ntpd_accepts_unauthenticated_pac

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