Vulnerability Name:

CVE-2021-22212 (CCN-203486)

Assigned:2021-06-08
Published:2021-06-08
Updated:2022-06-04
Summary: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.
CVSS v3 Severity:7.4 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
6.4 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
5.9 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N)
5.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:5.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
5.6 Medium (CCN CVSS v2 Vector: AV:N/AC:H/Au:S/C:C/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-327
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2021-22212

Source: CCN
Type: Red Hat Bugzilla - Bug 1955859
CVE-2021-22212 ntpsec: ntpkeygen generates weak keys

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1955859

Source: XF
Type: UNKNOWN
ntpsec-cve202122212-mitm(203486)

Source: CCN
Type: NTPsec GIT Repository
NTPsec

Source: CONFIRM
Type: Third Party Advisory
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22212.json

Source: MISC
Type: Issue Tracking, Patch, Third Party Advisory
https://gitlab.com/NTPsec/ntpsec/-/issues/699

Source: FEDORA
Type: Mailing List, Third Party Advisory
FEDORA-2021-3ffc890685

Vulnerable Configuration:Configuration 1:
  • cpe:/a:ntpsec:ntpsec:1.2.0:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/o:fedoraproject:fedora:34:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:112729
    P
    		libntpc1-1.2.1-1.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106201
    P
    		libntpc1-1.2.1-1.2 on GA media (Moderate)
    2021-10-01
    BACK
    ntpsec ntpsec 1.2.0
    fedoraproject fedora 34