Executive Summary

This vulnerability exists in DNN's CKEditor file upload endpoint prior to version 10.1.0. It involves insufficient sanitization of filenames, allowing an attacker to upload files with specially crafted Unicode characters. These characters can be translated into paths that expose internal network resources of the hosted site, potentially allowing unauthorized probing of network endpoints.

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Impact Analysis

The vulnerability can allow an attacker to probe and potentially access internal network resources of the hosted site by uploading files with crafted filenames. This could lead to unauthorized information disclosure about the internal network structure, which might be leveraged for further attacks.

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Mitigation Strategies

Upgrade DNN (DotNetNuke) to version 10.1.0 or later, as this version includes a patch that fixes the insufficient sanitization of filenames in the CKEditor file upload endpoint. Until the upgrade can be applied, consider restricting or monitoring file uploads to the CKEditor endpoint to prevent exploitation.

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