CVE-2024-6388 in Ubuntu Advantage Desktop Pro
Summary
by MITRE • 06/27/2024
Marco Trevisan discovered that the Ubuntu Advantage Desktop Daemon, before version 1.12, leaks the Pro token to unprivileged users by passing the token as an argument in plaintext.
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Analysis
by VulDB Data Team • 08/27/2025
The Ubuntu Advantage Desktop Daemon represents a critical security vulnerability that exposes sensitive authentication credentials to unauthorized users through improper privilege management and argument handling. This flaw affects versions prior to 1.12 and demonstrates a fundamental failure in secure credential handling within desktop environment services. The daemon's design passes the Pro token as a plaintext argument, creating an exploitable vector that allows unprivileged users to access sensitive authentication information through process inspection mechanisms.
The technical implementation of this vulnerability stems from the daemon's failure to properly isolate privileged credentials from unprivileged processes. When the daemon executes with elevated privileges to perform system management functions, it inadvertently exposes the Pro token through command-line arguments that remain visible to all users on the system. This violates established security principles of least privilege and credential isolation, creating a direct pathway for privilege escalation and unauthorized access to Ubuntu Advantage subscription services. The vulnerability specifically relates to CWE-200, which addresses the improper exposure of sensitive information, and CWE-772, concerning the improper disposal of resources.
The operational impact of this vulnerability extends beyond simple credential leakage to encompass potential system compromise and unauthorized service access. An unprivileged user can exploit this flaw by examining process arguments through tools like ps or /proc filesystem access, thereby obtaining the Pro token and potentially gaining access to premium Ubuntu Advantage services without proper authorization. This creates risks for organizations that rely on Ubuntu Advantage subscriptions for security updates and support, as unauthorized users could potentially abuse these credentials for malicious purposes. The vulnerability enables attackers to perform actions that should be restricted to authorized users, including accessing subscription-specific features and potentially bypassing security controls.
Mitigation strategies for this vulnerability require immediate patching of affected systems to version 1.12 or later, which implements proper credential handling mechanisms. Organizations should also implement monitoring for suspicious process argument patterns and conduct regular security audits of running processes to detect potential exploitation attempts. The fix typically involves removing plaintext credential passing and implementing secure credential storage mechanisms such as environment variables with restricted permissions or secure memory allocation techniques. Security teams should also review and enforce proper access controls for system management services, ensuring that only authorized users can access sensitive system components. This vulnerability demonstrates the importance of following secure coding practices and adheres to ATT&CK technique T1550.003, which covers the use of process injection and credential access through process arguments, highlighting the need for comprehensive privilege management and secure credential handling in desktop environments.