Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ntpsec | Ntpsec | 1.2.0 |
| Fedoraproject | Fedora | 34 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1955859Issue TrackingPatchThird Party Advisory
- https://gitlab.com/NTPsec/ntpsec/-/issues/699Issue TrackingPatchThird Party Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.jsonThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://bugzilla.redhat.com/show_bug.cgi?id=1955859Issue TrackingPatchThird Party Advisory
- https://gitlab.com/NTPsec/ntpsec/-/issues/699Issue TrackingPatchThird Party Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.jsonThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2021-22212?
CVE-2021-22212 is a vulnerability with a CVSS score of 4.0 (MEDIUM). 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,...
How severe is CVE-2021-22212?
CVE-2021-22212 has been rated MEDIUM with a CVSS base score of 4.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-22212?
Check the references section above for vendor advisories and patch information. Affected products include: Ntpsec Ntpsec, Fedoraproject Fedora.