CVE-2021-22212

2021-06-0812:07:02

GitLab

www.cve.org

ntpkeygen

ntpsec 1.2.0

key generation

key parsing

administrator

brute-force

mitm

aes128

warning

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

38.7%

JSON

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.

CNA Affected

[
  {
    "product": "ntpsec",
    "vendor": "NTPsec",
    "versions": [
      {
        "status": "affected",
        "version": "=1.2.0"
      }
    ]
  }
]