CCE-95698-7| Platform: cpe:/o:debian:debian_linux:11.x, cpe:/o:ubuntu:ubuntu_linux:16.04, cpe:/o:ubuntu:ubuntu_linux:18.04, cpe:/o:ubuntu:ubuntu_linux:20.04, cpe:/o:ubuntu:ubuntu_linux:22.04, cpe:/o:ubuntu:ubuntu_linux:23.04 | Date: (C)2021-06-15 (M)2023-09-01 |
OpenSSH can use multiple MAC algorithms.
Rationale:
Ensuring only strong algorithms or site policy appropriate MAC algorithms should be used. The only strong MACs currently FIPS 140-2 approved are hmac-sha2-256 and hmac-sha2-512.
Fix:
Edit the /etc/ssh/sshd_config file to set the parameter as follows:
Macs hmac-sha2-256,hmac-sha2-512
Parameter:
[hmac-sha2-256,hmac-sha2-512]
Technical Mechanism:
Edit /etc/ssh/sshd_config file and add/modify the MACs line to contain a comma separated list of the site approved MACs
| CCSS Severity: | CCSS Metrics: |
| CCSS Score : 6.2 | Attack Vector: LOCAL |
| Exploit Score: 2.5 | Attack Complexity: LOW |
| Impact Score: 3.6 | Privileges Required: NONE |
| Severity: MEDIUM | User Interaction: NONE |
| Vector: AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | Scope: UNCHANGED |
| | Confidentiality: HIGH |
| | Integrity: NONE |
| | Availability: NONE |
| | |
References: | Resource Id | Reference |
|---|
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:69552 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:85275 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:70833 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:87417 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:92289 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:70729 |
