Configure Proper Cryptographic Algorithms for the SSH Service

As cryptographic technologies develop and computing capabilities improve, some cryptographic algorithms are no longer suitable for today SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right...

Do Not Use X11 Forwarding

The X11 forwarding function of SSH allows the GUI program of the remote host to be executed on the local host. If the X11 forwarding function is enabled, the attack surface is expanded and other users on the X11 server may attack the local host. If the function is not required in the service...

Configure Proper MACs Algorithms for the SSH Service

In cryptography, a message authentication code MAC is an authentication mechanism used by communication entities to check message integrity. If the configured algorithms are insecure, security risks increase because weak algorithms have been or are about to be cracked in the industry. The...

Bind Network Interfaces to the Correct Zones

Different filtering policies can be configured for different firewall zones. If the server network is complex and has multiple interfaces that provide different service functions, it is recommended that interfaces be configured in different zones and different firewall policies be configured. For...

Disable PermitUserEnvironment

PermitUserEnvironment allows users to set SSH environment variables, which may be exploited by attackers to launch attacks. If PermitUserEnvironment is set to yes, attackers can modify SSH environment variables to evade the security mechanism or execute attack code. This configuration must be...

Configure a Proper SSH Service Authentication Mode

A proper authentication mode helps ensure user and system data security. Typically, the user/password authentication mode is suitable for human-machine users. In non-interactive login scenarios, the public and private keys are suitable for authentication. In high-risk scenarios, only the public a...

Do Not Preset known_hosts for the SSH Service

knownhosts stores the public keys of the computers that the host has accessed. After a user successfully logs in to another computer, the public key information is automatically saved in $HOME/.ssh/knownhosts. When the same computer is accessed next time, its public key is verified. If the...

Do Not Configure the Encryption Algorithm Overwriting Policy for the SSH Service

The configuration files of the SSH encryption algorithms are /etc/ssh/sshdconfig and /etc/sysconfig/sshd. When the SSH service is running, you can edit the /etc/sysconfig/sshd file to overwrite the encryption algorithm policy. If the encryption algorithm overwriting policy is configured, users ar...

CVE-2025-47203

dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a shell is used...

CVE-2025-47203

dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a shell is used...

CVE-2025-47203

dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a shell is used...

PT-2025-20286

Name of the Vulnerable Software and Affected Versions: Dropbear SSH versions prior to 2025.88 Description: The issue allows command injection via an untrusted hostname argument, because a shell is used. This occurs when the dbclient in Dropbear SSH is used with an untrusted hostname...

CVE-2025-47203

CVE-2025-47203 affects the Dropbear SSH package’s dbclient before version 2025.88. The vulnerability arises because a shell is used when processing the hostname argument, allowing an attacker to craft an untrusted hostname that can trigger command execution. Impact is described as arbitrary comma...

CVE-2025-47203

dbclient in Dropbear SSH before 2025.88 allows command injection via an untrusted hostname argument, because a shell is used...

CVE-2025-4041

In Optigo Networks ONS NC600 versions 4.2.1-084 through 4.7.2-330, an attacker could connect with the device's ssh server and utilize the system's components to perform OS command executions...

CVE-2025-4041 Use of Hard-coded Credentials Optigo Networks ONS NC600

In Optigo Networks ONS NC600 versions 4.2.1-084 through 4.7.2-330, an attacker could connect with the device's ssh server and utilize the system's components to perform OS command executions...

CVE-2025-4041

Optigo Networks ONS NC600, versions 4.2.1-084 through 4.7.2-330, are affected by CVE-2025-4041. An attacker who can access the device’s SSH service could leverage system components to execute OS commands on the device. The impact is consistent with a remote command execution risk affecting availa...

CVE-2025-4041 Use of Hard-coded Credentials Optigo Networks ONS NC600

In Optigo Networks ONS NC600 versions 4.2.1-084 through 4.7.2-330, an attacker could connect with the device's ssh server and utilize the system's components to perform OS command executions...

CVE-2025-4041: Use of Hard-coded Credentials

In Optigo Networks ONS NC600 versions 4.2.1-084 through 4.7.2-330, an attacker could connect with the device's ssh server and utilize the system's components to perform OS command executions...

ROS-20250505-01

The vulnerability in the Golang programming language SSH server is related to the fact that the application does not control internal resources consumption in the ssh packet when working with clients that are slow or do not perform key exchange at all. or do not perform key exchange at all...