In jenkins/ssh-agent Docker images 6.11.1 and earlier, SSH host keys are generated on image creation for images based on Debian, causing all containers based on images of the same version use the same SSH host keys, allowing attackers able to insert themselves into the network path between the SSH client (typically the Jenkins controller) and SSH build agent to impersonate the latter.

In jenkins/ssh-slave Docker images based on Debian, SSH host keys are generated on image creation for images based on Debian, causing all containers based on images of the same version use the same SSH host keys, allowing attackers able to insert themselves into the network path between the SSH client (typically the Jenkins controller) and SSH build agent to impersonate the latter.

The SSH Plugin stores credentials which allow jobs to access remote servers via the SSH protocol. User passwords and passphrases for encrypted SSH keys are stored in plaintext in a configuration file.

Jenkins SSH2 Easy Plugin 1.4 and earlier does not verify that permissions configured to be granted are enabled, potentially allowing users formerly granted (typically optional permissions, like Overall/Manage) to access functionality they're no longer entitled to.

A missing permission check in Jenkins SSH Plugin 2.6.1 and earlier allows attackers with Overall/Read permission to connect to an attacker-specified SSH server using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.

A cross-site request forgery (CSRF) vulnerability in Jenkins SSH Plugin 2.6.1 and earlier allows attackers to connect to an attacker-specified SSH server using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.

A missing permission check in Jenkins SSH Plugin 2.6.1 and earlier allows attackers with Overall/Read permission to enumerate credentials IDs of credentials stored in Jenkins.

Missing permission checks in Jenkins SSH Agent Plugin 1.23 and earlier allows attackers with Overall/Read access to enumerate credentials IDs of credentials stored in Jenkins.

An exposure of sensitive information vulnerability exists in Jenkins SSH Agent Plugin 1.15 and earlier in SSHAgentStepExecution.java that exposes the SSH private key password to users with permission to read the build log.

jenkins-plugin-ssh-credentials: Arbitrary file read vulnerability in SSH Credentials Plugin with Credentials Binding Plugin (SECURITY-440)

A arbitrary file read vulnerability exists in Jenkins SSH Credentials Plugin 1.13 and earlier in BasicSSHUserPrivateKey.java that allows attackers with a Jenkins account and the permission to configure credential bindings to read arbitrary files from the Jenkins master file system.

It was found that jenkins-ssh-slaves-plugin before version 1.15 did not perform host key verification, thereby enabling Man-in-the-Middle attacks.