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Nuclei Templates

Auerswald COMpact 5500R 7.8A and 8.0B Devices Backdoor

ID: CVE-2021-40859

Severity: critical

Author: pussycat0x

Tags: cve2021,cve,iot,unauth,voip,auerswald

Description

Section titled “Description”

Auerswald COMpact 5500R 7.8A and 8.0B devices contain an unauthenticated endpoint (“https://192.168.1[.]2/about_state”), enabling the bad actor to gain backdoor access to a web interface that allows for resetting the administrator password.

YAML Source

Section titled “YAML Source”
id: CVE-2021-40859


info:
  name: Auerswald COMpact 5500R 7.8A and 8.0B Devices Backdoor
  author: pussycat0x
  severity: critical
  description: Auerswald COMpact 5500R 7.8A and 8.0B devices contain an unauthenticated endpoint ("https://192.168.1[.]2/about_state"), enabling the bad actor to gain backdoor access to a web interface that allows for resetting the administrator password.
  impact: |
    Unauthenticated attackers can gain unauthorized access to affected devices.
  remediation: |
    Apply the latest firmware update provided by Auerswald to fix the backdoor vulnerability.
  reference:
    - https://thehackernews.com/2021/12/secret-backdoors-found-in-german-made.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-40859
    - https://www.redteam-pentesting.de/en/advisories/-advisories-publicised-vulnerability-analyses
    - https://www.redteam-pentesting.de/en/advisories/rt-sa-2021-007/-auerswald-compact-multiple-backdoors
  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-2021-40859
    epss-score: 0.02655
    epss-percentile: 0.89305
    cpe: cpe:2.3:o:auerswald:compact_5500r_firmware:7.8a:build002:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: auerswald
    product: compact_5500r_firmware
    fofa-query: '"auerswald"'
  tags: cve2021,cve,iot,unauth,voip,auerswald


http:
  - method: GET
    path:
      - "{{BaseURL}}/about_state"


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"pbx"'
          - '"dongleStatus":0'
          - '"macaddr"'
        condition: and


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


      - type: status
        status:
          - 200
# digest: 490a00463044022028299d14a119ebf80099c5b101ab095eaedf1bb5713110b16481370c81b6d584022010cc244c652e6b4c04a98478e6a075ae4bb336653dea303ee448b92e94aa8f70:922c64590222798bb761d5b6d8e72950

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-2021-40859.yaml"

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