CCE-95635-9| 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)2021-03-08 (M)2023-09-01 |
The MaxStartups parameter specifies the maximum number of concurrent unauthenticated connections to the SSH daemon.
Rationale:
To protect a system from denial of service due to a large number of pending authentication connection attempts, use the rate limiting function of MaxStartups to protect availability of sshd logins and prevent overwhelming the daemon.
Fix:
Edit /etc/ssh/sshd_config file to set the parameter as follows: MaxStartups 10:30:60
Parameter:
[10:30:60]
Technical Mechanism:
Edit /etc/ssh/sshd_config file to set the parameter as follows: MaxStartups 10:30:60
| CCSS Severity: | CCSS Metrics: |
| CCSS Score : 9.8 | Attack Vector: NETWORK |
| Exploit Score: 3.9 | Attack Complexity: LOW |
| Impact Score: 5.9 | Privileges Required: NONE |
| Severity: CRITICAL | User Interaction: NONE |
| Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | Scope: UNCHANGED |
| | Confidentiality: HIGH |
| | Integrity: HIGH |
| | Availability: HIGH |
| | |
References: | Resource Id | Reference |
|---|
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:68688 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:92200 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:70678 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:85212 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:87358 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:70768 |
