CVE-2024-6087 in lunary
Summary
by MITRE • 09/13/2024
An improper access control vulnerability exists in lunary-ai/lunary at the latest commit (a761d83) on the main branch. The vulnerability allows an attacker to use the auth tokens issued by the 'invite user' functionality to obtain valid JWT tokens. These tokens can be used to compromise target users upon registration for their own arbitrary organizations. The attacker can invite a target email, obtain a one-time use token, retract the invite, and later use the token to reset the password of the target user, leading to full account takeover.
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Analysis
by VulDB Data Team • 09/20/2024
The vulnerability described in CVE-2024-6087 represents a critical access control flaw within the lunary-ai/lunary application that fundamentally undermines the security of user authentication mechanisms. This issue stems from improper validation of authentication tokens issued through the invite user functionality, creating a dangerous pathway for unauthorized access. The flaw exists at the core of the application's user management system where tokens intended for temporary invitation purposes are being misused to gain persistent access to target accounts. The vulnerability demonstrates a clear breakdown in the principle of least privilege and proper session management, allowing attackers to exploit the system's trust model in ways that were never intended by the developers.
The technical implementation of this vulnerability involves a fundamental flaw in how the application handles one-time use tokens and their subsequent conversion into JWT tokens. When an attacker successfully invites a target user via email, the system generates a token that should be ephemeral and tied to a specific registration process. However, the vulnerability allows this token to be reused beyond its intended scope, enabling attackers to manipulate the authentication flow and obtain valid JWT tokens that grant full access to the target user's account. This represents a classic case of insufficient input validation and improper token lifecycle management, where the system fails to properly validate the context and usage of authentication tokens.
The operational impact of this vulnerability extends far beyond simple unauthorized access, creating a comprehensive account takeover scenario that can lead to complete compromise of user data and system integrity. Attackers can systematically target specific users by inviting them to organizations they control, then later using the obtained tokens to reset passwords and gain full administrative access to those accounts. This vulnerability directly enables privilege escalation and persistent access to sensitive user information, making it particularly dangerous for applications handling confidential data. The attack vector follows a well-defined pattern that can be automated, allowing for large-scale compromise of multiple user accounts within the system.
The vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and demonstrates characteristics of the ATT&CK technique T1531 for Account Access Removal and T1078 for Valid Accounts. The flaw creates an attack surface that allows adversaries to maintain long-term access to compromised accounts, potentially enabling data exfiltration, lateral movement, and further exploitation of the compromised environment. Organizations using this application face significant risk of data breaches, unauthorized access to sensitive information, and potential regulatory compliance violations. The vulnerability also exposes the system to potential denial of service attacks through account manipulation and could facilitate more sophisticated attacks involving privilege escalation and access to additional system resources.
Mitigation strategies should focus on implementing proper token validation mechanisms, establishing stricter access controls for authentication tokens, and ensuring that one-time use tokens cannot be reused or converted into persistent authentication mechanisms. The system must enforce proper session management practices, including token expiration, usage tracking, and context validation. Security measures should include rate limiting for invitation requests, enhanced monitoring for suspicious authentication patterns, and immediate token invalidation upon user registration or account modification. Additionally, implementing multi-factor authentication and regular security audits of authentication flows will help prevent similar vulnerabilities from emerging in the future. The fix should involve strict validation that prevents the reuse of invitation tokens and ensures that JWT tokens are only generated after proper verification of user identity and registration completion.