CVE-2024-1741: Lunary Auth Bypass Vulnerability

CVE-2024-1741 Overview

CVE-2024-1741 is a critical improper authorization vulnerability affecting lunary-ai/lunary version 1.0.1, an AI observability and analytics platform. The vulnerability allows removed organization members to continue accessing and manipulating prompt templates using previously captured authorization tokens. Despite having their membership revoked from an organization, malicious actors can exploit this flaw to read, create, modify, and delete sensitive prompt template data by sending HTTP requests with their old authorization tokens.

Critical Impact

Removed organization members can maintain unauthorized access to sensitive prompt templates, enabling data theft, tampering, and potential manipulation of AI workflows within affected organizations.

Affected Products

• Lunary version 1.0.1
• Lunary AI observability platform (versions prior to patch)

Discovery Timeline

• 2024-04-10 - CVE-2024-1741 published to NVD
• 2025-01-31 - Last updated in NVD database

Technical Details for CVE-2024-1741

Vulnerability Analysis

This vulnerability stems from a fundamental flaw in the authorization mechanism within Lunary's access control system. When organization administrators remove a member from their organization, the application fails to properly invalidate or revoke the associated authorization tokens. This creates a window of persistent unauthorized access where former members can continue to interact with organization resources as if they were still active members.

The vulnerability is classified under CWE-863 (Incorrect Authorization), which describes scenarios where a product performs an authorization check that does not correctly determine whether the actor is authorized to perform an action. In this case, the token validation logic does not verify whether the token owner's membership status is currently valid within the organization context.

Root Cause

The root cause of this vulnerability lies in the inadequate token lifecycle management and missing membership verification checks during API request authorization. When a user's organization membership is revoked, the system fails to:

1. Invalidate existing authorization tokens associated with that user-organization relationship
2. Verify current membership status during token-based authorization checks
3. Implement proper session termination or token revocation mechanisms

This architectural oversight allows stale tokens to remain valid and functional, granting continued access to organization-scoped resources like prompt templates.

Attack Vector

The attack vector is network-based and requires no user interaction. An attacker who was previously a legitimate member of an organization needs only to have captured their authorization token during their membership period. After being removed from the organization, the attacker can craft HTTP requests targeting the prompt template endpoints, including the old authorization token in the request headers. The server processes these requests without verifying whether the token owner is still an active member, granting full CRUD (Create, Read, Update, Delete) access to prompt templates.

The attack flow involves an attacker capturing their authorization token while still an organization member, then being removed from the organization by an administrator. Subsequently, the attacker sends authenticated HTTP requests to prompt template endpoints using the captured token, and the server accepts the requests and performs the requested operations without membership validation.

Detection Methods for CVE-2024-1741

Indicators of Compromise

• API requests to prompt template endpoints from IP addresses not associated with current organization members
• Unusual access patterns to prompt templates following user removal events
• Audit log entries showing template modifications by users no longer in the organization roster
• High-frequency API calls from tokens associated with removed members

Detection Strategies

• Implement correlation rules comparing user removal events with subsequent API activity from those users
• Monitor for authorization token usage patterns that continue after membership revocation
• Deploy anomaly detection on prompt template access patterns to identify unauthorized modifications
• Enable detailed API request logging with user identity and organization membership verification status

Monitoring Recommendations

• Enable comprehensive audit logging for all prompt template operations including read, create, update, and delete actions
• Correlate user management events (removal, suspension) with subsequent API authentication attempts
• Monitor for API requests using tokens that should have been invalidated
• Set up alerts for prompt template modifications occurring outside normal business patterns

How to Mitigate CVE-2024-1741

Immediate Actions Required

• Upgrade to the patched version of Lunary that includes commit d8e2e73efd53ab4e92cf47bbf4b639a9f08853d2
• Invalidate all existing authorization tokens for users who have been removed from organizations
• Review audit logs for any unauthorized access by former organization members
• Regenerate authorization tokens for all current organization members as a precautionary measure

Patch Information

Lunary has released a security patch addressing this vulnerability. The fix is available in the GitHub commit d8e2e73. Organizations running Lunary should immediately update to a version containing this patch. The vulnerability was reported through the Huntr bug bounty program, which contains additional technical details about the disclosure.

Workarounds

• Implement additional authorization layers at the network or application gateway level to verify organization membership
• Regularly rotate all authorization tokens and enforce short token expiration times
• Deploy API gateway rules that cross-reference user tokens against current organization membership before forwarding requests
• Consider implementing session-based authentication with immediate revocation capabilities as an interim measure

# Token rotation and member audit example
# Review current organization members
lunary-cli org list-members --org-id YOUR_ORG_ID

# Force token rotation for all members
lunary-cli tokens rotate --org-id YOUR_ORG_ID --all-members

# Review audit logs for removed member activity
lunary-cli audit-log query --org-id YOUR_ORG_ID --include-removed-members