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Published by CyberDudeBivash • Date: Oct 31, 2025 (IST)

Website Wipeout Risk: You MUST Patch DNN Platform Immediately Due to Critical Unauthenticated Flaw

CVE-2025-64095: The default HTML editor provider in DNN allows unauthenticated file uploads and can overwrite existing site files, enabling instant defacement and script injection. The vendor patched this in DNN Platform 10.1.1; upgrade now.CyberDudeBivash Ecosystem:Apps & Services · Threat Intel (Blogger) · CryptoBivash · News Portal · Subscribe: ThreatWire

TL;DR — Patch to 10.1.1 Immediately

Impact: Unauthenticated attacker can upload files and overwrite existing content → defacement, script injection, potential persistence.
Fixed in: DNN Platform 10.1.1 (security release).
Risk posture: CVSS reported as Critical by multiple trackers (CWE-434 Unrestricted Upload). Treat as internet-wormable at the app layer
Action now: Block upload endpoints → back up → upgrade to 10.1.1 → verify WAF rules → hunt IIS logs for suspicious uploads.

What Is CVE-2025-64095?

The DNN (DotNetNuke) core’s default HTML editor provider permits unauthenticated uploads and can overwrite existing files on the site. That means an attacker does not need a login to push a file and replace key assets (images, JS, even HTML content files), leading to instant defacement and potential malicious script execution (e.g., XSS), depending on what gets overwritten. Fixed in 10.1.1.

Affected Versions & Exposure

Versions: All DNN Platform releases prior to 10.1.1.
Fix: Update to 10.1.1 (vendor security release).
Why it’s critical: Attack is network-based, requires no privileges and no user interaction, and can destroy trust/content in one request. Multiple independent trackers highlight Critical severity.

Detections: IIS Log & File-System Hunts

Focus on same-day triage while you prepare the upgrade:

IIS/Reverse Proxy Indicators

Look for HTTP POST requests to editor/upload endpoints (paths noted in site config) from unfamiliar IPs; short bursts of POST → 200/302 responses with small bodies.
Identify first-seen POSTs from single IPs followed by a wave of GETs to modified assets (e.g., .png or .js that suddenly start redirecting).

# Example: grep compressed IIS logs for suspicious POSTs to upload endpoints
zcat u_ex*.log.gz | grep -Ei "POST .*(/edit|/html|/upload|/file|/content).*" | awk '{print $1,$2,$3,$4,$5,$6,$7,$8,$9}' | sort | uniq -c

Webroot/File-System Clues

Recently modified files in /Portals/0, /Portals/\*, /images, /js, /Resources with unexpected editors as the modifying user.
Mismatched hashes of brand/JS assets vs. last known good (LKG) backups.
New hidden files (e.g., .ico/.png that are actually HTML/JS).

Emergency Mitigation (Pre-Patch)

Restrict upload endpoints at the edge (WAF/NGFW): allow only authenticated/admin sessions; otherwise 403. See sample rule below.
Temporarily disable or swap the vulnerable default HTML editor provider until patched (vendor advisory reference).
Read-only mode for public sites during maintenance windows to prevent overwrite attempts.
File integrity monitoring: hash critical asset folders and alert on changes.

# Concept WAF rule (pseudocode)
if request.method == POST and path matches /(edit|html|upload|file|content)/ and not session.isAuthenticated then block(403)

Zero-Downtime Upgrade to 10.1.1 (Checklist)

Backup DB + site folder; snapshot VM/container.
Maintenance page at edge; drain connections.
Apply DNN 10.1.1 (security release). Follow vendor notes; avoid mixing older editor providers.
Clear caches, recycle app pool, warm up pages.
Validate: re-hash key assets; verify upload endpoints require auth; retest WAF blocks.
Monitor logs for 24–48h for blocked POSTs & suspicious asset fetches.

Post-Patch Hardening

Lock uploads: force auth + role checks; restrict MIME/types; store uploads outside webroot when possible.
Content Security Policy (CSP) to curb malicious script execution if an overwrite ever occurs.
Least privilege on app pool identity; disable unused editor providers/modules.
Stay current: Track other 2025 DNN vulns (SSRF bypass, Prompt/XSS, login IP filter bypass) and keep to latest LTS.

FAQ

Is exploitation in the wild confirmed?

As of Oct 31, 2025, public trackers emphasize critical risk characteristics and vendor patch availability. Treat as highly exploitable and patch immediately.

Which exact component is vulnerable?

The default HTML editor provider shipped with DNN allowed unauthenticated uploads and file overwrite; fixed in 10.1.1.

We run older 9.x — can we hotfix?

Vendor guidance is to upgrade to 10.1.1. For short-term risk reduction, block upload paths at WAF/reverse proxy and enforce auth on editor routes until upgrade completes.

Sources

DNN GitHub Security Advisory — Insufficient Access Control: Image Upload allows for Site Content Overwrite (GHSA-3m8r-w7xg-jqvw), Oct 28–29, 2025.
CVE-2025-64095 — MITRE record.
DNN Platform 10.1.1 release notes — “⚠️ Includes Important Security Updates ⚠️”.
Tracker summaries (severity/impact/mitigation): Wiz, Tenable, CIRCL, Meterian.

Ecosystem: cyberdudebivash.com | cyberbivash.blogspot.com | cryptobivash.code.blog | cyberdudebivash-news.blogspot.com | ThreatWire

#CyberDudeBivash #CyberBivash #DNN #DotNetNuke #CVE202564095 #FileUpload #Defacement #WAF #IIS #ThreatWire

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