CVE-2024-32969

Executive Summary

CVE-2024-32969 is a vulnerability in Vantage6, an open-source infrastructure for privacy-preserving analysis. The flaw allows collaboration administrators to add extra organizations to their collaboration, which can then create new users with known passwords. These users can then read task results from other collaborations that the added organization is involved in. This is a privilege escalation and information disclosure issue, but it requires relatively trusted users (collaboration administrators) to exploit, reducing its overall impact. The CVSS score is 2.7 (Low). The vulnerability is patched in version 4.5.0rc3.

Supply Chain & Package Security

This vulnerability is in the Vantage6 Python package. Organizations using Vantage6 should ensure they are using version 4.5.0rc3 or later. The package is distributed via PyPI. Administrators should verify the integrity of the package using checksums or signatures provided by the vendor.

CVSS Breakdown & Threat Level

• CVSS Score: 2.7 (Low)
• Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low (L) - No special conditions are required for exploitation.
• Privileges Required (PR): High (H) - The attacker must be a collaboration administrator.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Unchanged (U) - The vulnerability does not affect resources beyond the vulnerable component.
• Confidentiality (C): Low (L) - Limited information disclosure (task results from other collaborations).
• Integrity (I): None (N) - No integrity impact.
• Availability (A): None (N) - No availability impact.

Threat Level: Low. The vulnerability requires high privileges (collaboration administrator) and only allows limited information disclosure.

Deep Dive & Mechanics

The vulnerability lies in the authorization mechanism for collaboration management. A collaboration administrator has the ability to add new organizations to their collaboration. The flaw is that when an organization is added, the system does not properly restrict the permissions of that organization. The added organization can then create new users within the Vantage6 system. Since the administrator knows the passwords of these newly created users, they can use those credentials to access other collaborations that the added organization is a member of. This allows the administrator to read task results from those other collaborations, bypassing the intended isolation between collaborations.

The root cause is a failure to enforce the principle of least privilege. The system trusts the collaboration administrator to add organizations, but does not verify that the added organization should have access to the administrator's own collaboration's data, nor does it prevent the administrator from leveraging the added organization's membership in other collaborations.

Vulnerable vs. Patched Code

The specific code changes are not publicly available. However, the patch in version 4.5.0rc3 likely addresses the authorization logic to prevent collaboration administrators from adding organizations that can then be used to access other collaborations. The fix probably involves:

1. Restricting the ability of a collaboration administrator to add organizations that are already members of other collaborations.
2. Implementing a check to ensure that newly created users by an added organization cannot be used to access collaborations other than the one they were added to.
3. Adding audit logging for such actions.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to a Vantage6 instance as a collaboration administrator.
• Knowledge of another collaboration that the target organization is a member of.

Exploitation Steps:

1. Add a Target Organization: As a collaboration administrator, add an organization (e.g., org_malicious) to your collaboration.
2. Create a User: Using the added organization's credentials (which you know), create a new user (e.g., user_malicious).
3. Access Other Collaboration: Log in as user_malicious and attempt to access the task results of another collaboration that org_malicious is a member of.
4. Extract Data: Read the task results from the other collaboration.

Lab Setup:

• Deploy a Vantage4.5.0rc2 instance.
• Create two collaborations: collab_A and collab_B.
• Add an organization org_target to both collaborations.
• As an administrator of collab_A, add org_target to collab_A (if not already).
• Create a new user under org_target and use it to access collab_B's task results.

Blue Team

Detection:

• Monitor for unusual patterns of organization additions by collaboration administrators.
• Alert on the creation of new users by organizations that were recently added to a collaboration.
• Monitor for access to task results from collaborations that a user should not have access to.

Prevention:

• Apply the patch by upgrading to Vantage6 version 4.5.0rc3 or later.
• Implement strict access controls and review collaboration administrator privileges.
• Enable audit logging for all administrative actions.

Indicators of Compromise (IOCs)

• Network:
  • Unusual API calls to /organization or /collaboration endpoints.
  • Access to task results from unexpected collaborations.
• Logs:
  • Log entries showing a collaboration administrator adding an organization.
  • Log entries showing a new user created by an organization that was recently added.
  • Log entries showing access to task results from a collaboration that the user's organization is not a member of.
• System:
  • Unexpected user accounts created in the Vantage6 system.

Detection Engineering

YARA Rule

rule Detect_Vantage6_CVE_2024_32969_Exploitation {
    meta:
        description = "Detects potential exploitation of CVE-2024-32969 in Vantage6 logs"
        author = "Valters IT"
        date = "2024-10-27"
        reference = "CVE-2024-32969"
    strings:
        $s1 = "add_organization" nocase
        $s2 = "create_user" nocase
        $s3 = "collaboration" nocase
        $s4 = "task_result" nocase
    condition:
        all of ($s1, $s2, $s3, $s4)
}

Sigma Rule

title: Vantage6 CVE-2024-32969 Exploitation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential exploitation of CVE-2024-32969 in Vantage6 logs
author: Valters IT
date: 2024/10/27
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2024-32969
logsource:
    product: vantage6
    service: application
detection:
    selection:
        EventID: 4624
        LogonType: 3
        TargetUserName: '*'
    condition: selection
falsepositives:
    - Legitimate administrative actions
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"Vantage6 CVE-2024-32969 Exploitation Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/organization"; http_uri; content:"add"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Upgrade to Vantage6 version 4.5.0rc3 or later.
2. Workaround: If upgrading is not immediately possible, restrict the ability of collaboration administrators to add organizations. Review and audit all existing collaboration administrators and their actions.
3. Long-term: Implement the principle of least privilege. Ensure that adding an organization to a collaboration does not grant that organization any additional privileges beyond what is necessary. Implement strict access controls and audit logging.

Valters IT