CVE-2024-8037 in Juju
Summary
by MITRE • 10/02/2024
Vulnerable juju hook tool abstract UNIX domain socket. When combined with an attack of JUJU_CONTEXT_ID, any user on the local system with access to the default network namespace may connect to the @/var/lib/juju/agents/unit-xxxx-yyyy/agent.socket and perform actions that are normally reserved to a juju charm.
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Analysis
by VulDB Data Team • 08/27/2025
The vulnerability described in CVE-2024-8037 represents a critical security flaw in the juju orchestration framework's hook tool implementation. This issue manifests through an improperly secured abstract UNIX domain socket that exposes sensitive system functionality to unauthorized local users. The vulnerability specifically affects the juju agent socket located at /var/lib/juju/agents/unit-xxxx-yyyy/agent.socket, where the abstract socket namespace prefix indicates a system-wide accessible socket that bypasses normal filesystem permissions. When combined with manipulation of the JUJU_CONTEXT_ID environment variable, this flaw creates a privilege escalation vector that allows local attackers to execute juju charm operations that should be restricted to authorized juju agents and controllers.
The technical exploitation of this vulnerability stems from the improper access controls implemented in the juju hook tool's socket communication mechanism. Abstract UNIX domain sockets in Linux provide a way for processes to communicate without requiring filesystem entries, but they still need appropriate permission controls to prevent unauthorized access. In this case, the socket lacks proper authentication and authorization checks, allowing any local user with access to the default network namespace to connect and interact with the juju agent. The JUJU_CONTEXT_ID variable manipulation further compounds this issue by potentially altering the execution context of the hook tool, enabling attackers to impersonate legitimate juju operations and execute unauthorized commands within the juju framework.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exposure. Local users with access to the default network namespace can perform actions that typically require administrative privileges within the juju environment, including executing charm hooks, modifying unit state, and potentially accessing sensitive configuration data. This vulnerability particularly affects systems where multiple users share the same host environment, such as shared development servers, containerized deployments, or cloud instances with multiple tenants. The attack surface is further expanded by the fact that abstract sockets are accessible system-wide, meaning that even users without direct filesystem access can exploit this vulnerability through network namespace manipulation or process injection techniques.
Security mitigations for this vulnerability should focus on implementing proper access controls and authentication mechanisms for the juju agent socket. The recommended approach involves configuring the socket with appropriate file permissions and using capability-based access controls to restrict who can connect to the abstract socket namespace. Additionally, implementing proper environment variable validation and sanitization can prevent the JUJU_CONTEXT_ID manipulation that enables this attack vector. Organizations should also consider implementing mandatory access controls through SELinux or AppArmor policies to further restrict socket access. The vulnerability aligns with CWE-284 (Improper Access Control) and represents a specific instance of insufficient privilege separation in containerized orchestration environments. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques using local network access and environment variable manipulation, specifically targeting the T1068 (Local Privilege Escalation) and T1566 (Phishing) tactics where attackers might leverage this vulnerability to gain unauthorized access to juju-managed systems.