5.5

CVE-2026-9494

ubuntu-pro-client Information Disclosure via Cleartext Bearer Token Exposure in Process Command Line

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCanonical
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Produkt ubuntu-pro-client (ubuntu-advantage-tools)
Default Statusunaffected
Version 0
Version < 37.3
Status affected
HerstellerCanonical
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Produkt Ubuntu 26.04 LTS
Default Statusaffected
Version 37.2ubuntu0.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 24.04 LTS
Default Statusaffected
Version 37.2ubuntu~24.04.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 22.04 LTS
Default Statusaffected
Version 37.2ubuntu~22.04.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 20.04 LTS
Default Statusaffected
Version 37.1ubuntu0~20.04.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 18.04 LTS
Default Statusaffected
Version 37.1ubuntu0~18.04.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 16.04 LTS
Default Statusaffected
Version 37.1ubuntu0~16.04.1
Status unaffected
HerstellerCanonical
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Produkt Ubuntu 14.04 LTS
Default Statusaffected
Version 19.7ubuntu0.1
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security@ubuntu.com 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE-214 Invocation of Process Using Visible Sensitive Information

A process is invoked with sensitive command-line arguments, environment variables, or other elements that can be seen by other processes on the operating system.

https://ubuntu.com/security/CVE-2026-9494