| Name | CVE-2020-13817 |
| Description | ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ntp (PTS) | buster | 1:4.2.8p12+dfsg-4 | vulnerable |
| bullseye | 1:4.2.8p15+dfsg-1 | fixed |
| ntpsec (PTS) | buster | 1.1.3+dfsg1-2+deb10u1 | fixed |
| bullseye | 1.2.0+dfsg1-4 | fixed |
| bookworm, bookworm (security) | 1.2.2+dfsg1-1+deb12u1 | fixed |
| trixie | 1.2.2+dfsg1-4 | fixed |
| sid | 1.2.3+dfsg1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| ntp | source | (unstable) | 1:4.2.8p14+dfsg-1 | low | | |
| ntpsec | source | (unstable) | (not affected) | | | |
Notes
[buster] - ntp <ignored> (Minor issue)
[stretch] - ntp <ignored> (Minor issue)
[jessie] - ntp <ignored> (Too intrusive to backport, requires new configuration)
- ntpsec <not-affected> (Doesn't affect ntpsec per upstream, #964395)
http://support.ntp.org/bin/view/Main/NtpBug3596
https://bugs.ntp.org/show_bug.cgi?id=3596
http://bk.ntp.org/ntp-stable/?PAGE=patch&REV=5e312021VVVkyioYBR_aeIP1LqMCVg (4.2.8p14)
http://bk.ntp.org/ntp-stable/?PAGE=patch&REV=5e4a536dzxRWAzMw-KsKjm04l6joNA (4.2.8p14)