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Full Disclosure: CyberDanube Security Research 20221130-0

Table of Contents

From: Thomas Weber < () cyberdanube com>
Date: Wed, 30 Nov 2022 11:06:55 +0100

CyberDanube Security Research 20221130-0
               title| Multiple Vulnerabilities
             product| Delta Electronics DX-2100-L1-CN
  vulnerable version| V1.5.0.10
       fixed version| V1.5.0.12
          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
DX-2100-L1-CN / V1.5.0.10

Vulnerability overview
1) Authenticated Command Injection

An authenticated command injection has been identified in the web
service of the device. It can be used to execute system commands on the
OS from
the device in the context of the user "root". Therefore, a full

of the device is possible by having credentials for the web service only.

2) Stored Cross-Site Scripting

A stored cross-site scripting vulnerability has been identified in the

"net diagnosis" on the device's web configuration service. This can be
exploited in the context of a victim's session.

Proof of Concept
1) Authenticated Command Injection

The parameter "diagnose_address" contains the payload ";ls /;", which
prints the content of the root directory to the serial terminal of the

The output can be seen in the context of a virtualized firmware clone,
as used
to find this vulnerability, but is usually invisible to a customer.

a more visible payload may be commands that interact via the network, like

";ping;". This command will ping a device on the
corresponding IP

address within the local network.

2) Stored Cross-Site Scripting

The following code prints the current cached cookies of a user's session
to the

screen. The JavaScript code will be stored on the device permanently.
POST /lform/urlfilter?action=save HTTP/1.1
Accept: */*
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: 190
Connection: keep-alive
Cookie: language=en_US; userindex=1; loginexpire=1648630746607; session=30


The vulnerabilities were manually verified on an emulated device by
using the

MEDUSA scalable firmware runtime (

Update to firmware version V1.5.0.12.



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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