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The vulnerability exists due to insufficient access control checks on the OpenAPI endpoint. Liferay Portal and DXP expose an OpenAPI specification file, typically at a predictable URL like /o/api, to describe its REST API structure. Under normal circumstances, this endpoint should enforce the portal’s authorization policies. However, in the affected versions, a flaw in the request handling logic allows a remote, unauthenticated attacker to bypass these checks. By crafting a specific HTTP request, such as manipulating request parameters or headers, an attacker can directly access the YAML/JSON file without proper authentication. This file contains a complete map of all API endpoints, including their parameters and data structures. While this does not directly grant data access, it significantly aids an attacker by revealing the API’s attack surface, facilitating the discovery of other, potentially more severe, vulnerabilities within the application.
Platform: Liferay Portal/DXP
Version: < 6.0.26, 7.4.0-7.4.3.109
Vulnerability: Improper Access Control
Severity: Moderate
date: 2024-10-23
Prediction: Patch expected 2024-10-30
What Undercode Say:
curl -s "http://target:8080/o/api" | grep -E "(paths|components)"
// Pseudocode for flawed access check
if (request.getPath().equals("/o/api")) {
// Missing isUserAuthenticated() check
return openApiYaml; // Vulnerability here
}
How Exploit:
Craft unauthenticated HTTP GET request to `/o/api` endpoint to retrieve the complete API specification YAML file, revealing all available endpoints and data models for reconnaissance.
Protection from this CVE:
Upgrade to Liferay versions 6.0.26, 7.4.3.110, DXP 2023.Q4.6, or later. Implement a web application firewall (WAF) rule to block unauthorized access to the `/o/api` path. Apply network-level access control lists.
Impact:
Information disclosure of API structure, leading to increased reconnaissance efficiency for attackers, potentially enabling the discovery of chained vulnerabilities. No direct data loss or system compromise.
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Sources:
Reported By: github.com
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