CVE-2021-22212
First published: Tue Jun 08 2021(Updated: )
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.
Credit: cve@gitlab.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| NTPsec | =1.2.0 | |
| Fedora | =34 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1955859
- https://gitlab.com/NTPsec/ntpsec/-/issues/699
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.json
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3GIT2HYL5BQXPGKI6ZDNG473IEQ5WQF2/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3GIT2HYL5BQXPGKI6ZDNG473IEQ5WQF2/
Frequently Asked Questions
What is the severity of CVE-2021-22212?
CVE-2021-22212 has a medium severity rating due to potential mismanagement of keys in NTPsec.
How do I fix CVE-2021-22212?
To fix CVE-2021-22212, users should avoid using '#' characters in keys generated by ntpkeygen.
Which versions of NTPsec are affected by CVE-2021-22212?
CVE-2021-22212 affects NTPsec version 1.2.0.
What consequence does CVE-2021-22212 have for administrators?
Administrators may find that keys created with '#' characters are either improperly loaded or unusable, leading to potential service disruption.
Is CVE-2021-22212 a vulnerability in Fedora?
Yes, CVE-2021-22212 impacts Fedora 34 due to its use of the affected NTPsec version.
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/references
- agent/remedy
- agent/weakness
- agent/severity
- agent/last-modified-date
- agent/author
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/ntpsec
- canonical/ntpsec
- version/ntpsec/1.2.0
- vendor/fedoraproject
- canonical/fedora
- version/fedora/34