Fedora 34 update for ntpsec



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-22212
CWE-ID CWE-327
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

ntpsec
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use of a broken or risky cryptographic algorithm

EUVDB-ID: #VU78974

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-22212

CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to improper input validation when parsing keys generated by ntpkeygen. If the key contains a string with with '#' characters, the ntpd then either pads, shortens the key, or fails to load these keys entirely, which can result in possibility to launch MITM attacks between ntp clients and ntp servers.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 34

ntpsec: before 1.2.1-3.fc34

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2021-3ffc890685


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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