cbcvebase.
CVE-2021-22212
published 2021-06-08

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…

PriorityP338high7.4CVSS 3.1
AVNACHPRNUINSUCHIHAN
EPSS
0.52%
40.8th percentile
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.

Affected

8 ranges
VendorProductVersion rangeFixed in
debianntpsec< ntpsec 1.2.0+dfsg1-4 (bookworm)ntpsec 1.2.0+dfsg1-4 (bookworm)
fedoraprojectfedora——
ntpsecntpsec——
ntpsecntpsec——
ntpsecntpsec>= 0 < 1.2.0+dfsg1-41.2.0+dfsg1-4
ntpsecntpsec>= 0 < 1.2.0+dfsg1-41.2.0+dfsg1-4
ntpsecntpsec>= 0 < 1.2.0+dfsg1-41.2.0+dfsg1-4
ntpsecntpsec>= 0 < 1.2.0+dfsg1-41.2.0+dfsg1-4

CVSS provenance

nvdv3.17.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
nvdv2.05.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:N
osv7.4HIGH
vendor_debian4.0MEDIUM
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