ubuntu-pro-client vulnerabilities

An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client validates Ubuntu Pro APT credentials by executing /usr/lib/apt/apt-helper with the secret bearer token embedded directly in the cleartext URL passed via command-line arguments (argv). On systems with a default-mounted /proc filesystem where process-hiding mitigations (hidepid) are disabled, an unprivileged local attacker can monitor system processes and read the sensitive bearer token from /proc/cmdline while the helper process is running.

A vulnerability in the ubuntu-pro-client (formerly ubuntu-advantage-tools) pro collect-logs command allows an unprivileged local attacker to create a symbolic link to root-readable files (e.g., /etc/shadow). When an administrator runs the tool, it follows the symlink and includes the sensitive file contents in the diagnostic archive, which is then accessible to the attacker.

An input validation vulnerability in ubuntu-pro-client (formerly ubuntu-advantage-tools) allows injection of arbitrary APT repository configurations and installation of malicious packages with root privileges. The issue stems from missing validation of contract server data used to generate APT source files and execute apt-get install commands.