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.

Category

4.0
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.04%
Vendor Advisory fedoraproject.org
Affected: NTPsec ntpsec
Published at:
Updated at:

References

Link Tags
https://gitlab.com/NTPsec/ntpsec/-/issues/699 issue tracking third party advisory patch
https://bugzilla.redhat.com/show_bug.cgi?id=1955859 issue tracking third party advisory patch
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.json third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3GIT2HYL5BQXPGKI6ZDNG473IEQ5WQF2/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-22212?
CVE-2021-22212 has been scored as a medium severity vulnerability.
How to fix CVE-2021-22212?
To fix CVE-2021-22212, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22212 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-22212 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22212?
CVE-2021-22212 affects NTPsec ntpsec.
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