Citrix ADC and Citrix NetScaler Gateway - Remote Code Injection

mediumseverity

6.5CVSS score

10.8%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

Citrix ADC and NetScaler Gateway are susceptible to remote code injection. An attacker can potentially execute malware, obtain sensitive information, modify data, and/or gain full control over a compromised system without entering necessary credentials. Affected versions are before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18. Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allow modification of a file download.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.

Fix

Apply the necessary security patches or updates provided by Citrix to mitigate this vulnerability.

How to confirm it

Send: GET /menu/guiw?nsbrand=1&protocol=nonexistent.1337">&id=3&nsvpx=phpinfo
Positive when: contains "<jnlp codebase=\"nonexistent.1337\">" AND contains in header "application/x-java-jnlp-file" AND status 200

Run it with nuclei: nuclei -id CVE-2020-8194 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2020-8194

info:
  name: Citrix ADC and Citrix NetScaler Gateway - Remote Code Injection
  author: dwisiswant0
  severity: medium
  description: Citrix ADC and NetScaler Gateway are susceptible to remote code injection. An attacker can potentially execute malware, obtain sensitive information, modify data, and/or gain full control over a compromised system without entering necessary credentials. Affected versions are before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18. Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allow modification of a file download.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the necessary security patches or updates provided by Citrix to mitigate this vulnerability.
  reference:
    - https://support.citrix.com/article/CTX276688
    - https://nvd.nist.gov/vuln/detail/CVE-2020-8194
    - https://github.com/Elsfa7-110/kenzer-templates
    - https://github.com/SexyBeast233/SecBooks
    - https://github.com/merlinepedra/nuclei-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    cvss-score: 6.5
    cve-id: CVE-2020-8194
    cwe-id: CWE-94
    epss-score: 0.10834
    epss-percentile: 0.95888
    cpe: cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: citrix
    product: application_delivery_controller_firmware
  tags: cve,cve2020,citrix,vkev,vuln

http:
  - raw:
      - |
        GET /menu/guiw?nsbrand=1&protocol=nonexistent.1337">&id=3&nsvpx=phpinfo HTTP/1.1
        Host: {{Hostname}}
        Cookie: startupapp=st

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<jnlp codebase=\"nonexistent.1337\">"

      - type: word
        part: header
        words:
          - "application/x-java-jnlp-file"

      - type: status
        status:
          - 200

References

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