1. Introduction
The Ektron CMS400.NET id Parameter XSS vulnerability allows an attacker to inject malicious script into web pages viewed by other users. This could lead to account takeover, data theft, or website defacement. The vulnerability affects systems running the Ektron CMS400.NET content management system. Successful exploitation can compromise confidentiality, integrity and availability of affected systems.
2. Technical Explanation
The Ektron CMS400.NET application fails to properly sanitize user input provided to the ‘id’ parameter within the ‘ekformsiframe.aspx’ script. This allows an attacker to inject arbitrary JavaScript code that will be executed in the browser of any user visiting a crafted URL. The vulnerability is tracked as CVE-2009-4473 and has a CWE score of 79, indicating cross-site scripting.
- Root cause: Insufficient input validation on the ‘id’ parameter within the ‘ekformsiframe.aspx’ script.
- Exploit mechanism: An attacker crafts a URL containing malicious JavaScript code in the ‘id’ parameter and sends it to unsuspecting users via email or other means. When the user clicks the link, the injected script is executed in their browser. For example:
http://example.com/ekformsiframe.aspx?id= - Scope: Ektron CMS400.NET content management system.
3. Detection and Assessment
To confirm vulnerability, check the installed version of Ektron CMS400.NET. A thorough assessment involves attempting to inject a simple XSS payload.
- Quick checks: Check the Ektron CMS version in the administration interface or by examining application files.
- Scanning: Nessus plugin ID 36279 can detect this vulnerability. Other scanners may also have relevant signatures.
- Logs and evidence: Monitor web server logs for requests containing suspicious JavaScript code within the ‘id’ parameter of ‘ekformsiframe.aspx’.
4. Solution / Remediation Steps
At this time there is no known solution for this vulnerability.
4.1 Preparation
- Consider a maintenance window to minimize disruption. A roll back plan involves restoring from backup.
4.2 Implementation
- Step 1: Monitor vendor advisories for a patch or update.
- Step 2: If an update is available, download and install it according to the vendor’s instructions.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
- Practice 2: Implement a web application firewall (WAF) to detect and block malicious requests, including those containing XSS payloads.
4.5 Automation (Optional)
No automation steps are available at this time due to the lack of a known solution.
5. Verification / Validation
- Re-test: Attempt to access a crafted URL containing an XSS payload (e.g.,
http://example.com/ekformsiframe.aspx?id=) and verify that the script does not execute. - Smoke test: Verify core CMS functionality, such as content editing and publishing, remains operational.
6. Preventive Measures and Monitoring
- Baselines: Update security baselines to include regular scanning for XSS vulnerabilities.
- Asset and patch process: Implement a regular patch management cycle to ensure timely application of security updates.
7. Risks, Side Effects, and Roll Back
8. References and Resources
- Vendor advisory or bulletin: No official vendor advisory available at this time.
- NVD or CVE entry: CVE-2009-4473
- Product or platform documentation relevant to the fix: No specific documentation available at this time.