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 using the download-file command. During this process, the secret bearer token is embedded directly in the cleartext URL component passed via the command-line arguments (argv), resulting in a URL format such as https://bearer:<token>@esm.ubuntu.com/.../. On systems utilizing a default-mounted /proc file system where process-hiding mitigations (such as hidepid) are disabled, an unprivileged local attacker can monitor system processes and read the sensitive bearer token directly from /proc/cmdline while the helper process is actively running. This leaked token can subsequently be used to gain unauthorized access to the victim's Ubuntu Pro or Expanded Security Maintenance (ESM) repositories.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| Canonical | Ubuntu-Pro-Client (Ubuntu-Advantage-Tools) | >= 0, < 37.3CNA affecteddefault unaffected | |
| Canonical | Ubuntu 18.04 LTS | Range not provided by sourceCNA affecteddefault affected | |
| Canonical | Ubuntu 20.04 LTS | Range not provided by sourceCNA affecteddefault affected | |
| Canonical | Ubuntu 22.04 LTS | Range not provided by sourceCNA affecteddefault affected | |
| Canonical | Ubuntu 24.04 LTS | Range not provided by sourceCNA affecteddefault affected |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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