CVE-2021-22212

Name	CVE-2021-22212
Description	ntpkeygen can generate keys that ntpd fails to parse. NTPsec 1.2.0 allows ntpkeygen to generate keys with '#' characters. ntpd then either pads, shortens the key, or fails to load these keys entirely, depending on the key type and the placement of the '#'. This results in the administrator not being able to use the keys as expected or the keys are shorter than expected and easier to brute-force, possibly resulting in MITM attacks between ntp clients and ntp servers. For short AES128 keys, ntpd generates a warning that it is padding them.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	989847

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
ntpsec (PTS)	buster	1.1.3+dfsg1-2+deb10u1	fixed
	bullseye	1.2.0+dfsg1-4	fixed
	bookworm (security), bookworm	1.2.2+dfsg1-1+deb12u1	fixed
	sid, trixie	1.2.3+dfsg1-3	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
ntpsec	source	buster	(not affected)
ntpsec	source	(unstable)	1.2.0+dfsg1-4			989847

Notes

[buster] - ntpsec <not-affected> (Only affects 1.2.0)
https://gitlab.com/NTPsec/ntpsec/-/issues/699
https://gitlab.com/NTPsec/ntpsec/-/commit/b09be47d650280cc7ebdcd45dfa07eca4b9a52f8