CVE-2025-12779 is a vulnerability classified under CWE-497, which pertains to the access of sensitive system information to an unauthorized control sphere. Specifically, this vulnerability affects the Amazon WorkSpaces client for Linux versions 2023.0 through 2024.8. The root cause lies in improper handling of authentication tokens used by DCV-based WorkSpaces within the client. Authentication tokens, which are critical for session validation and access control, are exposed in a manner that allows other local users on the same Linux client machine to extract these tokens. This exposure occurs because the tokens are not adequately isolated or protected in the local environment, enabling a local attacker with low privileges to retrieve another user's token. Once obtained, the attacker can impersonate the legitimate user and access their Amazon WorkSpace, potentially gaining full access to the user's virtual desktop environment. The vulnerability does not require user interaction but does require the attacker to have local access to the client machine. The CVSS 4.0 base score is 8.8, indicating a high severity due to the high impact on confidentiality, integrity, and availability, combined with relatively low attack complexity and privileges required. Amazon has released an updated client version 2025.0 that addresses this issue by improving token handling and isolation mechanisms. No known exploits are currently reported in the wild, but the vulnerability poses a significant risk in multi-user Linux environments where Amazon WorkSpaces clients are deployed.

The impact of CVE-2025-12779 is substantial for organizations using Amazon WorkSpaces on Linux clients, especially in shared or multi-user environments. Unauthorized access to authentication tokens can lead to session hijacking, allowing attackers to impersonate legitimate users and access sensitive corporate resources within the WorkSpace. This compromises confidentiality by exposing potentially sensitive data and user credentials. Integrity is at risk as attackers could modify data or configurations within the WorkSpace. Availability could also be affected if attackers disrupt user sessions or perform malicious activities. The vulnerability's requirement for local access limits remote exploitation but raises concerns in environments such as shared workstations, virtual desktop infrastructure (VDI) setups, or cloud-hosted Linux desktops where multiple users have access. Organizations relying on Amazon WorkSpaces for remote work, development, or secure desktop environments may face increased insider threat risks or lateral movement opportunities for attackers who gain local access. The absence of known exploits in the wild reduces immediate risk but does not eliminate the potential for targeted attacks or future exploit development. Failure to upgrade could lead to unauthorized access incidents, data breaches, and compliance violations, especially in regulated industries.

To mitigate CVE-2025-12779, organizations should immediately upgrade all Amazon WorkSpaces clients for Linux to version 2025.0 or later, where the vulnerability has been addressed. Beyond patching, organizations should enforce strict access controls on Linux client machines to limit the number of users with local access, reducing the attack surface. Implementing user session isolation techniques and leveraging containerization or sandboxing for WorkSpaces clients can further protect authentication tokens from unauthorized access. Monitoring and auditing local user activities on shared machines can help detect suspicious attempts to access or extract authentication tokens. Additionally, organizations should educate users about the risks of shared environments and enforce policies that prevent sharing of client machines among multiple users. Employing endpoint detection and response (EDR) solutions capable of identifying token theft or unusual access patterns may provide early warning of exploitation attempts. Finally, consider using multi-factor authentication (MFA) and session timeout policies within Amazon WorkSpaces to limit the window of opportunity for attackers using stolen tokens.