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.
Published: 2021-06-08
Score: 4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-9358 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.
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Fedoraproject Fedora
Ntpsec Ntpsec
cve-icon MITRE

Status: PUBLISHED

Assigner: GitLab

Published:

Updated: 2024-08-03T18:37:18.446Z

Reserved: 2021-01-05T00:00:00.000Z

Link: CVE-2021-22212

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-06-08T13:15:07.567

Modified: 2024-11-21T05:49:43.237

Link: CVE-2021-22212

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses