CVE-2021-22212 Weak cryptography in ntpsec

What is CVE-2021-22212?

CVE-2021-22212 is a medium-severity vulnerability in Fedoraproject Fedora, published on 8 Jun 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-327

Which versions are affected by CVE-2021-22212?

It affects 2 products.

Products include Fedoraproject Fedora, Ntpsec Ntpsec.

How do I fix CVE-2021-22212?

Upgrade to a fixed version.

Is CVE-2021-22212 being exploited?

There is no known exploitation of CVE-2021-22212 in the wild and no public exploit code.

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All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-22212, GHSA-57r9-f9gp-9f2x.