| Name | CVE-2015-1798 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-192-1, DSA-3223-1 |
| Debian Bugs | 782095 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ntp (PTS) | jessie, jessie (lts) | 1:4.2.6.p5+dfsg-7+deb8u3 | fixed |
| stretch | 1:4.2.8p10+dfsg-3+deb9u2 | fixed |
| buster, buster (lts) | 1:4.2.8p12+dfsg-4+deb10u1 | fixed |
| bullseye | 1:4.2.8p15+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| ntp | source | squeeze | 1:4.2.6.p2+dfsg-1+deb6u3 | | DLA-192-1 | |
| ntp | source | wheezy | 1:4.2.6.p5+dfsg-2+deb7u4 | | DSA-3223-1 | |
| ntp | source | (unstable) | 1:4.2.6.p5+dfsg-6 | | | 782095 |
Notes
http://bugs.ntp.org/show_bug.cgi?id=2779
http://support.ntp.org/bin/view/Main/SecurityNotice#ntpd_accepts_unauthenticated_pac