CVE-2026-9494 An information disclosure vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools)
Description
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.
Produits et versions touchés
| Produit | Versions touchées | Corrigé en |
|---|---|---|
| ubuntu-pro-client (ubuntu-advantage-tools) 37.3 | premières → < 37.3 | 37.3 |
| Ubuntu 26.04 LTS 37.2 | premières → < 37.2ubuntu0.1 | 37.2ubuntu0.1 |
| Ubuntu 24.04 LTS | Versions non publiées | |
| Ubuntu 22.04 LTS | Versions non publiées | |
| Ubuntu 20.04 LTS | Versions non publiées | |
| Ubuntu 18.04 LTS | Versions non publiées | |
| Ubuntu 16.04 LTS | Versions non publiées | |
| Ubuntu 14.04 LTS 19.7 | premières → < 19.7ubuntu0.1 | 19.7ubuntu0.1 |