CVE-2019-9482 in MISP
Summary
by MITRE
In MISP 2.4.102, an authenticated user can view sightings that they should not be eligible for. Exploiting this requires access to the event that has received the sighting. The issue affects instances with restrictive sighting settings (event only / sighting reported only).
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Analysis
by VulDB Data Team • 07/26/2023
The vulnerability described in CVE-2019-9482 represents a critical access control flaw within the MISP (Malware Information Sharing Platform) threat intelligence platform version 2.4.102. This issue manifests as an information disclosure vulnerability where authenticated users can bypass intended access restrictions to view sighting data that should be limited to specific audiences. The vulnerability specifically impacts organizations that have configured restrictive sighting settings, particularly those using event-only or sighting-reported-only access controls, which are designed to limit visibility of threat intelligence data based on user permissions and organizational policies.
The technical implementation of this flaw occurs within the sighting visibility mechanisms of the MISP platform, where the access control checks fail to properly validate user permissions against the sighting data. When a user with authenticated access attempts to view sightings associated with events they have access to, the system incorrectly grants access to sighting information that should be restricted based on the configured sighting settings. This represents a direct violation of the principle of least privilege and demonstrates a failure in the platform's authorization controls. The vulnerability requires an authenticated user to have access to the underlying event data, but once that access is established, the system fails to properly enforce the sighting-level access restrictions that should normally be in place.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can compromise the integrity of threat intelligence sharing within organizations that rely on MISP for their security operations. When users can view sightings beyond their authorized scope, it potentially exposes sensitive threat intelligence data that may include indicators of compromise, threat actor patterns, or other critical information that should remain restricted to specific personnel or teams. This can lead to unauthorized access to strategic threat intelligence, potentially enabling malicious actors to gain insights into organizational security posture, detection capabilities, or defensive measures that should remain confidential. The vulnerability particularly affects organizations with strict data handling policies and those operating in regulated environments where unauthorized disclosure of threat intelligence could result in compliance violations or operational security breaches.
Organizations should implement immediate mitigations including updating to patched versions of MISP that address this access control flaw, reviewing and strengthening sighting configuration settings, and conducting comprehensive access control audits to identify potential unauthorized access to threat intelligence data. The vulnerability aligns with CWE-284, which addresses improper access control in software systems, and can be mapped to ATT&CK technique T1078 for valid accounts and T1566 for credential access, as it represents a privilege escalation through improper access control mechanisms. Security teams should also consider implementing additional monitoring for unauthorized sighting access attempts and establish clear procedures for reviewing and validating sighting data access permissions, particularly in environments where multiple teams or organizations share the same MISP instance.