CVE-2021-22212

 

Published at: - 08-06-2021 03:15

Last modified: - 04-06-2022 05:02

Total changes: - 4

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

 

Verification logic

 

Reference

• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.json
• https://gitlab.com/NTPsec/ntpsec/-/issues/699
• https://bugzilla.redhat.com/show_bug.cgi?id=1955859
• FEDORA-2021-3ffc890685-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2021-22212

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures