CVE-2017-0929

Think of your web app like a “helper” that downloads images. This bug can let a bad actor trick that helper into reaching out to internal addresses your business doesn’t intend to expose (like systems on your internal network). That can reveal information or help them map what’s inside.

This matters if you run DotNetNuke (DNN) as your website or web application using DotNetNuke.Core. It’s most relevant when the affected image handling feature is reachable from the internet, because the weakness can be triggered by requests to the app (no special login is required, per the available findings). If your site isn’t publicly reachable, the risk is much lower.

This is an AMBER issue because it’s a high-impact vulnerability (SSRF) in a widely used web platform component and the fix is available. Even though CISA KEV doesn’t list it and there’s no confirmed “in the wild” signal in the provided findings, the risk is still real for any public DNN deployment running an unpatched version.

1. Confirm exposure

   • Identify your running version of DotNetNuke/DotNetNuke.Core.
   • Check whether your site is reachable from the internet (typical for customer-facing businesses).

2. Determine whether you’re affected

   • If your DotNetNuke or DotNetNuke.Core version is older than 9.2.0, you’re in the affected range.

3. Upgrade to the fixed version

   • Upgrade DotNetNuke and/or DotNetNuke.Core to 9.2.0 or later.
   • The known fixed version from the findings is 9.2.0 for both dotnetnuke and dotnetnuke.core.

4. Regression testing after upgrade

   • Test basic site functionality.
   • Specifically verify image-related features still work as expected (since the issue is in DnnImageHandler).

5. Temporary workaround (if you cannot upgrade immediately)

   • If you have the ability to reduce exposure, limit public access to any DNN endpoints related to image loading/handling.
   • Apply strict input validation at the application or gateway level if you can identify the relevant parameters being used to trigger image fetching.
   • Keep monitoring until you can complete the upgrade.

6. What to monitor

   • Look for unusual outbound requests originating from the web server process (e.g., requests to internal/private IP ranges) around the time of suspicious user activity.
   • Review web/app logs for unexpected patterns that involve image handler usage.

Severity: high (public CVSS indicates high impact potential; findings categorize as high severity). Weakness: CWE-918 (Server-Side Request Forgery). Mechanism: SSRF in DnnImageHandler can be triggered without authentication to cause the server to fetch attacker-influenced resources, potentially reaching internal network destinations and exposing internal information.

Exploitation status: No CISA KEV listing in the provided findings, and weaponization details are not substantively confirmed (only detection template material is present). Predicted likelihood (EPSS) is provided as a prediction only; the findings do not claim confirmed exploitation.

Fix: DotNetNuke and DotNetNuke.Core are fixed in 9.2.0 per the patch findings.