Vulnerability in Ntpsec
CVE-2021-22212
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.
Vulnerability class: POODLE (CVE-2014-3566)
EPSS: 0.005 (41.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N.
Affected products
- Ntpsec — versions =1.2.0, 1.2.0
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- cve@gitlab.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- cve@gitlab.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- cve@gitlab.com (x_refsource_CONFIRM, Third Party Advisory)
- cve@gitlab.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-22212?
- CVE-2021-22212 is a medium-severity vulnerability in Ntpsec, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.0/10. Published 2021-06-08.
- How severe is CVE-2021-22212?
- Medium severity. CVSS v3 base score is 4.0 out of 10.