1. Introduction
The remote web server contains an ASP.NET application that is affected by a SQL injection vulnerability in the DNN (DotNetNuke) DNNArticle Module categoryid parameter. This allows attackers to potentially gain unauthorized access to sensitive data and compromise the database. Systems running vulnerable versions of DotNetNuke are at risk. A successful attack could lead to authentication bypass, discovery of sensitive information, or attacks against the underlying database impacting confidentiality, integrity, and availability.
2. Technical Explanation
The vulnerability is due to a failure to properly sanitize user-supplied input to the ‘categoryid’ parameter of the ‘dnnarticlerss.aspx’ script in DNN. An unauthenticated attacker can exploit this by injecting malicious SQL code into the categoryid parameter, which will be executed against the database. CVE-2013-5117 describes this issue.
- Root cause: Missing input validation on the ‘categoryid’ parameter of the ‘dnnarticlerss.aspx’ script allows for arbitrary SQL commands to be injected.
- Exploit mechanism: An attacker can send a crafted HTTP request with malicious SQL code in the categoryid parameter, leading to database manipulation. For example, an attacker could inject `’ OR 1=1 –` into the categoryid parameter to bypass authentication.
- Scope: DotNetNuke versions are affected. Specific vulnerable versions were not provided in the context.
3. Detection and Assessment
To confirm if a system is vulnerable, check the installed DNN version first. A thorough method involves examining web requests for unsanitized input to the ‘dnnarticlerss.aspx’ script.
- Quick checks: Check the DotNetNuke version in the Admin Center or by inspecting the application files.
- Scanning: Nessus, OpenVAS, and other vulnerability scanners may identify this issue using signature ID 61788. These are examples only.
- Logs and evidence: Examine web server logs for requests to ‘dnnarticlerss.aspx’ with suspicious characters in the categoryid parameter. Look for SQL-like syntax or error messages related to database queries.
4. Solution / Remediation Steps
The solution is currently unknown at this time. Apply any available security patches or updates for DotNetNuke as soon as they are released.
4.1 Preparation
- Ensure you have a rollback plan in place, such as restoring from backup.
- A change window may be required depending on your environment; approval from relevant stakeholders should be obtained.
4.2 Implementation
- Step 1: Monitor the DotNetNuke website for official security updates and patches released by the vendor.
- Step 2: Once a patch 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
Several security practices can help prevent this type of vulnerability. Input validation is crucial for blocking unsafe data, and least privilege reduces impact if exploited.
- Practice 1: Implement robust input validation on all user-supplied parameters to prevent malicious code injection.
- Practice 2: Apply the principle of least privilege by granting only necessary permissions to database users.
4.5 Automation (Optional)
No automation steps are available at this time due to the unknown solution.
5. Verification / Validation
Confirm that the fix worked by checking the installed DNN version and re-testing for the vulnerability. A simple service smoke test should also be performed.
- Post-fix check: Verify the updated DotNetNuke version in the Admin Center or application files.
- Smoke test: Ensure core DNN functionality, such as user login and content display, continues to work as expected.
- Monitoring: Monitor web server logs for any suspicious activity related to SQL injection attempts.
6. Preventive Measures and Monitoring
Update security baselines and implement checks in CI/CD pipelines to prevent similar vulnerabilities. A sensible patch review cycle is also important.
- Baselines: Update your security baseline or policy to include requirements for input validation and secure coding practices.
- Pipelines: Add Static Application Security Testing (SAST) tools to your CI/CD pipeline to identify potential SQL injection vulnerabilities in code.
- Asset and patch process: Establish a regular patch review cycle to ensure timely application of security updates.
7. Risks, Side Effects, and Roll Back
Applying patches may introduce compatibility issues or service disruptions. A rollback plan should be available.
- Risk or side effect 1: Patch installation could cause temporary downtime; schedule during a maintenance window.
- Roll back: Restore the DNN database and application files from backup if any issues occur during patching.
8. References and Resources
Refer to official advisories and trusted documentation for this vulnerability.
- Vendor advisory or bulletin: https://github.com/dnnsoftware/DotNetNuke/security/advisories
- NVD or CVE entry: CVE-2013-5117
- Product or platform documentation relevant to the fix: https://dnnsoftware.com/docs/security-best-practices