How to remediate – MaxWebPortal <= 1.35 Multiple Vulnerabilities

1. Introduction

The MaxWebPortal application, version 1.35 and earlier, contains multiple vulnerabilities that could allow attackers to compromise a web server. This is due to flaws in how it handles user input, potentially leading to data theft or website changes. Systems running this software are at risk of cross-site scripting (XSS) and SQL injection attacks, which can impact confidentiality, integrity, and availability.

2. Technical Explanation

The MaxWebPortal application is vulnerable due to insufficient input validation and improper handling of database queries. An attacker could inject malicious code into web forms or URLs that the application then processes without sanitisation. This allows them to execute arbitrary scripts on a user’s browser (XSS) or directly interact with the underlying database (SQL injection). CVE-2005-1561 and CVE-2005-1562 describe these issues.

• Root cause: Missing input validation in ASP application forms and URL parameters.
• Exploit mechanism: An attacker could submit a crafted URL containing malicious SQL code, or inject JavaScript into a form field. For example, submitting a URL like http://example.com/search?q=' OR '1'='1 might bypass authentication.
• Scope: MaxWebPortal versions up to and including 1.35 are affected.

3. Detection and Assessment

Confirming vulnerability requires checking the application version and testing for common injection flaws. A quick check is possible via the banner, but thorough assessment needs active probing.

• Quick checks: Check the MaxWebPortal banner displayed on the web server’s homepage to confirm the version number.
• Scanning: Nessus plugin ID 28359 and OpenVAS scanner script maxwebportal_multiple_vulnerabilities may detect this issue, but results should be verified manually.
• Logs and evidence: Examine application logs for error messages related to SQL queries or JavaScript execution errors. Look for suspicious characters in URL parameters.

curl -I http://example.com/ | grep Server

4. Solution / Remediation Steps

Currently, there is no known official patch available for this vulnerability. The following steps outline mitigation and potential workarounds.

4.1 Preparation

• Stop the web service hosting MaxWebPortal to prevent further exploitation during remediation.
• Roll back plan: Restore from backup or revert to the previous snapshot if issues occur. Change window approval may be needed depending on your organisation’s policy.

4.2 Implementation

1. Step 1: Implement strict input validation on all user-supplied data, including form fields and URL parameters.
2. Step 2: Use parameterized queries or stored procedures to prevent SQL injection attacks. Avoid concatenating user input directly into SQL statements.

4.3 Config or Code Example

Before

strSQL = "SELECT * FROM Products WHERE ProductName = '" & Request.QueryString("ProductName") & "'"

After

strSQL = "SELECT * FROM Products WHERE ProductName = ?"
Set rs = conn.Execute(strSQL, Array(Request.QueryString("ProductName")))

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help prevent this type of vulnerability.

• Practice 2: Least privilege limits the damage an attacker can do if they successfully exploit a vulnerability.
• Practice 3: A regular patch cadence ensures that known vulnerabilities are addressed promptly.

4.5 Automation (Optional)

No automation is available due to the lack of a specific patch. However, static code analysis tools can help identify potential input validation issues in ASP code.

5. Verification / Validation

Confirming the fix requires re-testing for injection flaws and verifying that key application functionality remains operational.

• Re-test: Attempt the same SQL injection payload used during initial assessment (e.g., http://example.com/search?q=' OR '1'='1) and verify that it no longer bypasses authentication or returns unexpected results.
• Smoke test: Verify that users can still log in, search for products, and submit forms without errors.
• Monitoring: Monitor application logs for any error messages related to SQL queries or JavaScript execution errors.

curl -I http://example.com/ | grep Server

6. Preventive Measures and Monitoring

Proactive measures can reduce the risk of similar vulnerabilities in the future.

• Baselines: Update security baselines to include input validation requirements for web applications.
• Pipelines: Integrate static application security testing (SAST) into the CI/CD pipeline to identify potential injection flaws early in the development process.
• Asset and patch process: Establish a regular review cycle for third-party components like MaxWebPortal, and apply patches promptly when available.

7. Risks, Side Effects, and Roll Back

Implementing input validation may introduce compatibility issues with existing applications or require code changes.

• Risk or side effect 1: Strict input validation could break legitimate user input if not implemented carefully. Thorough testing is required.
• Roll back: Restore from backup, revert to the previous snapshot, or remove the changes made to input validation and database queries.

8. References and Resources

Links related to this specific vulnerability.

• Vendor advisory or bulletin: No official vendor advisory is available at this time.
• NVD or CVE entry: CVE-2005-1561 and CVE-2005-1562
• Product or platform documentation relevant to the fix: No specific documentation is available for this version of MaxWebPortal.